Making a AG100 go crazy fast

[honda_power]

Carver is going to get into the world of motocross with his brand new ride - a late 80's ag100. Basically we want it to go faster. What cheap/free mods could be done to give it more balls, bearing in mind aftermarket parts (obviously) dont exist for this model.

[blackdog]

weight reduction.

go on a diet.

[cheese]

I think that there is heaps of mods for AG100s as they are used as bucket racers.

[honda_power]

Really? I have looked on the net and cant find hardly anything about ag's let alone modding them?

[EJK]

weight reduction.

go on a diet.

Take a dump.

-1kg

[barty5]

try a yz125 exhuast on it bigger carb, rebore big over size , air box mods

[kevfromcoro]

I ported a yamy 100 once.. reved like shit but lost all of its bottom end.
Took about 3mm off the top of the exhaust port
Pull the pipe off,, and biff it in the fire for a few minutes.. burns all the oil and shit out of it.
there are a few pipe mods that can be done,
a bit of experiment i think.......
this could be fun....................

[honda_power]

thanks guys, this is what we are after, cant say the same for the fuckwit road riders though.

The top ends off it at the moment, big end is pretty rooted but we just gonna run it for now.
So after is was ported it ran more like an 80? How much is it to get someone to port it? Cylinder has to be honed at the very least anyway

[cheese]

From memory I think that you can add a MX electrical system to make them liven up too. Open the air box and see if you could fit a YZ piston.

There was a crazy mod people were doing a few years back where you drilled two holes in the back of teh piston. No idea what that was about...

[Mental Trousers]

weight reduction.

go on a diet.
Take a dump.

-1kg

The human brain weighs quite a lot so take that out ..... oh, wait, this is Carver we're talking about .....
:innocent:

[Mental Trousers]

From memory I think that you can add a MX electrical system to make them liven up too. Open the air box and see if you could fit a YZ piston.

There was a crazy mod people were doing a few years back where you drilled two holes in the back of teh piston. No idea what that was about...

Drilling the piston skirts to make the piston lighter??

The AG piston is over engineered so weight can be shaved off it (carefully of course and not too much)

[kevfromcoro]

From memory I think that you can add a MX electrical system to make them liven up too. Open the air box and see if you could fit a YZ piston.

There was a crazy mod people were doing a few years back where you drilled two holes in the back of teh piston. No idea what that was about...

Havent heard of drilling a piston.. but there was a mod where the bottom of the piston on the intake side was filled down... let more gas in..and sooner...
duno never tryed it.
all of this filling things out.. once its done, its done,,
cant file it back on again. just a thought

[T.W.R]

Check out some grasskart racing sites or look for local clubs. AG100 motors are used for junior racing karts and get tricked out pretty well before the drivers are allowed to move up to modified shifterkarts :yes:
good AG powered karts will nudge 160kph on tarseal & shifterkarts can do well in excess of 200kph. My workshop foreman had a shifterkart with a hot CR250 in it and it was geared for 220kph and got there fuckin fast :shit: but you couldn't stop it.
Both his sons had AG powered karts that went really well :yes:

[Reckless]

There was a crazy mod people were doing a few years back where you drilled two holes in the back of teh piston. No idea what that was about...

Jeepers Cheese??? You should know this??
Your own bike has them from factory??
Here 2004 Cr250 Piston

213512


They are called boost port windows or Transfer port windows in the piston.

213513

They let extra fuel into the crankcase as the piston passes the inlet port. So when the piston comes down it has more to push up the transfer ports?? I suppose it lightens the piston but that is not the main purpose. Its about stuffing more fuel into the chamber. We did this to our kart pistons, or made them bigger.
Early bikes or non performance bikes didn't have them so they where drilled or machined in.

[Reckless]

Check out some grasskart racing sites or look for local clubs. AG100 motors are used for junior racing karts and get tricked out pretty well before the drivers are allowed to move up to modified shifterkarts :yes:
good AG powered karts will nudge 160kph on tarseal & shifterkarts can do well in excess of 200kph. My workshop foreman had a shifterkart with a hot CR250 in it and it was geared for 220kph and got there fuckin fast :shit: but you couldn't stop it.
Both his sons had AG powered karts that went really well :yes:

Yep my Cagiva 125 on methanol was good for about 120 MPH at manfield, Doesn't actually sound very fast but the speed of the kart comes form the cornering ability we'd chuck them into the sweeper at the end of the straight flat out.
I remember getting out of the pits first at Cemetery curcit for the warm up (or was it Masterton street race with the bikes??) The crowd was standing at the footpath edge and I saw them do a runner as they didn't think there was anyway in hell I was going to make the corner? Funny has hell it was!
A CR250 Kart like you say is a bit faster! And a proper Rotax super kart is good for 160mph
In my day there where a few proper Rotax superkarts around in NZ but none left anymore I don't think??

Here 125cc

213520

Superkart 250cc Rotax

213521

Wiki blog on them
Powered by a 2-stroke 250 cc engine producing 95 hp (71 kW) for an overall weight including the driver of 215 kilograms, Superkarts have a power/weight ratio of 440 hp/tonne (330 W/kg)(c.5 lbs/hp). Superkarts can accelerate from 0 to 60 mph in less than 3 seconds with a top speed of 155 mph (250 km/h)[4]. Their low weight and good downforce make for staggering cornering[5] and braking abilities[6]. A Superkart is capable of braking from 100 mph (160 km/h) to standstill in around 2 seconds, and taking corners at nearly 3 g (30 m/s²)[7].

OH shit sorry to hijack your thread mate I must drink less and go to bed LOL!!!

[WuZards-Eugene]

I put a 1mm oversize piston and had the barrel bored out, richened the mixture a little and it hauls pretty good for an AG. Still has all the bottom end, but when it reaches mid to top end it sort of explodes into life alot like hitting a power band. Changed the gearing a bit as well, and managed to get 130kph out of it (revving like shit). Still has all the fangles on it.

[cheese]

Jeepers Cheese??? You should know this??
Your own bike has them from factory??
Here 2004 Cr250 Piston

213512


They are called boost port windows or Transfer port windows in the piston.

213513

They let extra fuel into the crankcase as the piston passes the inlet port. So when the piston comes down it has more to push up the transfer ports?? I suppose it lightens the piston but that is not the main purpose. Its about stuffing more fuel into the chamber. We did this to our kart pistons, or made them bigger.
Early bikes or non performance bikes didn't have them so they where drilled or machined in.

My last two pistons haven't had them!

[cave weta]

Dont file or drill anything!! you can so easily make it worse.
The best mods are the YZ exhaust, then put two cylinder base gaskets on to it and machine the head by 80-90 thou. that raises the ports.
If you are rebuilding the bottom end then stuff the crank. Force cork or balsa plugs into the crank balancing holes to increase primary compression.
Give it a CDI unit instead of points and a 28mm mikuni carbie.

Do all this and my CT90 will still beat you! Come summertime.....


The Over The Top Adventures

World's Fastest Postie Bike will amaze and astound you......

a stripped and streamlined postie bike with rearsets and clipons, a 149cc big bore kit, tuned exhaust and a 36mm Mikuni running methanol, 12,500 rpm and 112Db!!!

photos coming soon to a computer near you!

[carver]

I see a cold war developing across the K gorge cave weta....

What can build the worlds most powerful ag bike...

Danny C will see that victory is ours....!

[carver]

oh, the big end is pretty fucked, and who wants to balance a crank on a ag?

[Ktmboy]

We used to mod Ag 100 and 175cc up north and fit side cars onto them. Had a group of 20 odd units racing at the saloon car club days. Couple of ambulances to each meet so the numbers dropped of a tad over a couple of years.

But we used to do exactly what Cave weta mentioned. even down to the 28mm carb. Pommy wizard by the name of Roger Wilkins used to port them sweet.

80 mph was the top speed we got on cemetry straight Kaikohe.

We used to lengthen the swing arm so they handled a bit better on the corners. No filter box and fitted Z bars to reduce the drag.

In fact its really me on my avater. Ha ha.

[cave weta]

We used to mod Ag 100 and 175cc up north and fit side cars onto them. Had a group of 20 odd units racing at the saloon car club days. Couple of ambulances to each meet so the numbers dropped of a tad over a couple of years.

But we used to do exactly what Cave weta mentioned. even down to the 28mm carb. Pommy wizard by the name of Roger Wilkins used to port them sweet.

80 mph was the top speed we got on cemetry straight Kaikohe.

We used to lengthen the swing arm so they handled a bit better on the corners. No filter box and fitted Z bars to reduce the drag.

In fact its really me on my avater. Ha ha.

LOL @ Tony!

[tommorth]

did they even bother putting holes in a ag crank ?? Where will this great race be held ? I'd like to watch.
Used to have an old cz that we modifyed a bit cut all the gaurds down ,fited a trumpet to carb, enlarged the ports and filed some of the piston skirt , removed lots of extra bits longer shocks , replaced the wireing used it to race a mates kt250 round flat track we had in a paddock .We also used to put a little meths in our fuel made the bike s sound awsome plus big back fires on the over run .None of it was very technical but when your 15 and live in a small town theres not much else to do

maybe there could be a under 100cc race seperate class for 2t and 4t no bikes based on rm/cr/kx80s etc farm trail type only any mods possible ... would be a good laugh
say b loop at thunder or even just the top paddock

pick is before it got xr shocks

[honda_power]

From memory I think that you can add a MX electrical system to make them liven up too. Open the air box and see if you could fit a YZ piston.

There was a crazy mod people were doing a few years back where you drilled two holes in the back of teh piston. No idea what that was about...

i always thought that just improved the lubrication, im pretty sure the instructions that came with a wiseco piston said you can drill holes




OH shit sorry to hijack your thread mate I must drink less and go to bed LOL!!!

no worries at all mate, a good read


I put a 1mm oversize piston and had the barrel bored out, richened the mixture a little and it hauls pretty good for an AG. Still has all the bottom end, but when it reaches mid to top end it sort of explodes into life alot like hitting a power band. Changed the gearing a bit as well, and managed to get 130kph out of it (revving like shit). Still has all the fangles on it.

stock ones still have a 'powerband though. good to see someone using a ag as something other than a farm bike, looks like you've had some good times on yours, thanks for posting


Dont file or drill anything!! you can so easily make it worse.
The best mods are the YZ exhaust, then put two cylinder base gaskets on to it and machine the head by 80-90 thou. that raises the ports.
If you are rebuilding the bottom end then stuff the crank. Force cork or balsa plugs into the crank balancing holes to increase primary compression.
Give it a CDI unit instead of points and a 28mm mikuni carbie.

Do all this and my CT90 will still beat you! Come summertime.....


The Over The Top Adventures

World's Fastest Postie Bike will amaze and astound you......

a stripped and streamlined postie bike with rearsets and clipons, a 149cc big bore kit, tuned exhaust and a 36mm Mikuni running methanol, 12,500 rpm and 112Db!!!

photos coming soon to a computer near you!

never heard of stuffing cork into a crank?! thats the kind of mods we're after though... free ones :D. Some good advice there, thanks, have to keep an eye out for a wrecked 80's yz125.

For a cdi would any mx bike do? an old yz80 or something?

I want to see these pics, even better a vid of it running. Race is on, fuck a drag, slater mx park :)


oh, the big end is pretty fucked, and who wants to balance a crank on a ag?

pretty fucked is an understatement. who the fuck is that in your pic?


did they even bother putting holes in a ag crank ?? Where will this great race be held ? I'd like to watch.
Used to have an old cz that we modifyed a bit cut all the gaurds down ,fited a trumpet to carb, enlarged the ports and filed some of the piston skirt , removed lots of extra bits longer shocks , replaced the wireing used it to race a mates kt250 round flat track we had in a paddock .We also used to put a little meths in our fuel made the bike s sound awsome plus big back fires on the over run .None of it was very technical but when your 15 and live in a small town theres not much else to do

maybe there could be a under 100cc race seperate class for 2t and 4t no bikes based on rm/cr/kx80s etc farm trail type only any mods possible ... would be a good laugh
say b loop at thunder or even just the top paddock

pick is before it got xr shocks

its on!

[cave weta]

[QUOTE=
I want to see these pics, even better a vid of it running. Race is on, fuck a drag, slater mx park :)
[/QUOTE]

with clip ons and rear sets!!!!????
Im thinking Canal East Road- Ngatea, Hauraki Plains

[NordieBoy]

I've posted this before but it's a good one...
<img src=http://www.photostorage.nelson.geek.nz/sports/motorsport/dirt/2003-11-30-Glenhope/slides/mvc-227f.jpg>

[CRF119]

They take alot of abuse i lernt on a CT125 that we got for free and i was jumping 20ft to flat before dad thought it was a good idea to buy me a mx bike and save his farm bike lol.

you need a reed block from a 125 with some carbon pettles and then also mod that so it flows even more.

Run Nitro methane in the fuel mix at 5% should give it a good kick

[Expert]

[QUOTE=cave weta;1129817447]Dont file or drill anything!! you can so easily make it worse.
The best mods are the YZ exhaust, then put two cylinder base gaskets on to it and machine the head by 80-90 thou. that raises the ports.
If you are rebuilding the bottom end then stuff the crank. Force cork or balsa plugs into the crank balancing holes to increase primary compression.
Give it a CDI unit instead of points and a 28mm mikuni carbie.

Do all this and my CT90 will still beat you! Come summertime.....


The Over The Top Adventures

World's Fastest Postie Bike will amaze and astound you......

a stripped and streamlined postie bike with rearsets and clipons, a 149cc big bore kit, tuned

exhaust and a 36mm Mikuni running methanol, 12,500 rpm and 112Db!!!



Very slow port timing on those ag barrels, i'd go for a 2mm alumininium spacer under the barrel and a corresponding amount off the top of the barrel and raise the exhaust port 1-2mm. and all the other mods mentioned. find a expansion chamber off a kx80 or similar and bodge that on too.
This is backyard buchery at its worst but you can't fail to make those ags rev harder.

[F5 Dave]

I think that there is heaps of mods for AG100s as they are used as bucket racers.
Wash yer mouth out with soap - I've raced buckets for well over 20 years & I can't ever remember seeing an AG engined bike. Too crap.

PS: KT100 is the std fare kart engine, not AG100 & they are a totally different beast.

Just ride the silly thing, any more power will make the gearbox ratios too far apart & handling rubbish.

[NordieBoy]

Just ride the silly thing, any more power will make the gearbox ratios too far apart & handling rubbish.

More power will make the handling rubbish?

[Buddha#81]

More power will make the handling rubbish?

its hardly going to improve it Nordie!:scooter:

[tommorth]

Its not like they handle well to start with anyhow so bit of a moot point really.
Tonys talk of ags with sidecars reminds me of my first bike a suzuki tc185 it had a sidecar on it when I got it hand ten gears ! It was seized from sitting so we fixed it with a large hammer and a bit or wood in the barrel lol .

[kevfromcoro]

Those old 2 strokes.. how did they keep going.
2 springs on the rear.. no travel.. front was no better.
have seen them seized on enduros.. cool them down. bit more oil.. a few bods pushing,, and away they went.
we dumped a susuki 125 in a creek one day.. went right under. took a gob full of water down the carb.. towed it for a few ks.. and away it went....
shit.. all this was over 30 years ago...
havent things changed.....

[F5 Dave]

More power will make the handling rubbish?
In the same way that a Norton Manx was considered to handle well was only that it was semi stable & didn't have much power to pull it out of shape. An AG is rubbish already, more power will make it worse.

I mean what is the point of all this anyway? Let's say you, on-the-cheap increase the performance up to TS125ER levels which would be asking a bit. What have you got? A dreadful bike with meagre power.

Take out an advert in Big Whoop magazine.

[carver]

They take alot of abuse i lernt on a CT125 that we got for free and i was jumping 20ft to flat before dad thought it was a good idea to buy me a mx bike and save his farm bike lol.

you need a reed block from a 125 with some carbon pettles and then also mod that so it flows even more.

Run Nitro methane in the fuel mix at 5% should give it a good kick

fuck that with 2~mm play in our big end

[NordieBoy]

its hardly going to improve it Nordie!:scooter:

My (subtle) point exactly :shifty:

The AG series isn't known for it's good handling at speed to start with :D

[Rupe]

Dont file or drill anything!! you can so easily make it worse.
The best mods are the YZ exhaust, then put two cylinder base gaskets on to it and machine the head by 80-90 thou. that raises the ports.
If you are rebuilding the bottom end then stuff the crank. Force cork or balsa plugs into the crank balancing holes to increase primary compression.
Give it a CDI unit instead of points and a 28mm mikuni carbie.

Do all this and my CT90 will still beat you! Come summertime.....


The Over The Top Adventures

World's Fastest Postie Bike will amaze and astound you......

a stripped and streamlined postie bike with rearsets and clipons, a 149cc big bore kit, tuned exhaust and a 36mm Mikuni running methanol, 12,500 rpm and 112Db!!!

photos coming soon to a computer near you!

Can anyone enter this race? Whats the restrictions??

[barty5]

So there is an ag100 a ct110 what else is aloud to enter in this race ???? might have to have a go at putting something together

[NordieBoy]

So there is an ag100 a ct110 what else is aloud to enter in this race ???? might have to have a go at putting something together

I'd say a CG125 would be a must.

[Rupe]

So there is an ag100 a ct110 what else is aloud to enter in this race ???? might have to have a go at putting something together

I guess you are think along the same lines as me!

[barty5]

will dt100 and mx 100 parts ie heads etc fit an ag100????

[barty5]

I guess you are think along the same lines as me!

yup theres an ag 100 on tm at the mo 300 no res

[B0000M]

ok, for this postie bike comp, is it a drag race? a mx race? an enduro?

what bikes qualify? im keen to get a shitter, not do much to it, and then hopefully out-ride you old bastards!

mx or enduro would suit! lol

[Ktmboy]

ok, for this postie bike comp, is it a drag race? a mx race? an enduro?

what bikes qualify? im keen to get a shitter, not do much to it, and then hopefully out-ride you old bastards!

mx or enduro would suit! lol

You could always enter your CR. That would be a fair comp. :shutup:

[carver]

I will have the AG going in a few weeks, once we decide what to do with that big end!

[honda_power]

will dt100 and mx 100 parts ie heads etc fit an ag100????

i will find out yor ya, i have a mx 100

as for otherbikes - tf125, ct125 etc etc

[B0000M]

CR125???

a real old one?

lol

[barty5]

CR125???

a real old one?

lol

i think an old cr is out really needs to be an old or new but based on old style farm bike to be fair where thinkin bout an 04 ag100 wont be any different from the older one s

[honda_power]

lol ask how to make a farmbike faster and everyone buys farmbikes and organizes a race... AWESOME.

Ill be able to sort out a really good course here in hamilton, with enduro-x elements to it if you guys are keen? Can make a few small jumps, tyre crossings, concrete pieces to ride over etc etc... maybe even a car or two to ride over

[flyingcr250]

lol ask how to make a farmbike faster and everyone buys farmbikes and organizes a race... AWESOME.

Ill be able to sort out a really good course here in hamilton, with enduro-x elements to it if you guys are keen? Can make a few small jumps, tyre crossings, concrete pieces to ride over etc etc... maybe even a car or two to ride over

ha ha ha im already looking on tardme fo an old bike :scooter:

[carver]

lol ask how to make a farmbike faster and everyone buys farmbikes and organizes a race... AWESOME.

Ill be able to sort out a really good course here in hamilton, with enduro-x elements to it if you guys are keen? Can make a few small jumps, tyre crossings, concrete pieces to ride over etc etc... maybe even a car or two to ride over

we can win with the power of homosexual lust.

Half these poofs wont show

[honda_power]

even with half of them would be a cool race... kinda like the milk race but cooler and harder

would be a fun little event out the back of jan's with all that shit there and those big dirt walls... would be a epic track

[tommorth]

All the old shitters on trae me are going up in value already lol. An old cr80 isn't really much diffeent from a newer one.

[barty5]

well if it fits im thinking FMF head and yz 100 pipe on an ag100 re jet or bigger carb go as big a rebore as i can find add in some porting and dig out the plasma cutter to shed some kilos

[cheese]

My first bike was an AG100, they don't like to be over revved....

[barty5]

dose a DRZ125 count ????? lol

[carver]

NXR might...i am thinking AG bikes (NXR, TF, CT, CTX, AG and maybe a Xl 125)

[honda_power]

NXR might...i am thinking AG bikes (NXR, TF, CT, CTX, AG and maybe a Xl 125)

nxrs and ctxs frames are well above ag's tf's ct's and xl's... theyr touching on xr and dr style bikes

perhaps it should be just twin shock...

[flyingcr250]

nxrs and ctxs frames are well above ag's tf's ct's and xl's... theyr touching on xr and dr style bikes

perhaps it should be just twin shock...

ive got a 1972 TS 185 in the shed:Punk:

[NordieBoy]

Talking to bro last night and with the AG he says to hog out the exhaust port and stuff as much fuel through as possible.

[cave weta]

I'd say a CG125 would be a must.

I once shoved an XR200 into a CG110 frame- that was vile to ride!

[Ride it till the red]

Those old 2 strokes.. how did they keep going.
2 springs on the rear.. no travel.. front was no better.
have seen them seized on enduros.. cool them down. bit more oil.. a few bods pushing,, and away they went.
we dumped a susuki 125 in a creek one day.. went right under. took a gob full of water down the carb.. towed it for a few ks.. and away it went....
shit.. all this was over 30 years ago...
havent things changed.....

I dunno, even reasonably modern 2 strokes seem to live through anything. Younger brother ran an 01 DS80 out of oil (self mixing) and it stopped as expected. Towed it home, topped up the oil and after a fair few decent kicks she fired back up and ran for the next couple years before we sold it. Mate dropped a CR125 in a river as we were trying to get home (late at night torrential rain etc etc) and it got dragged under and off a ledge into the deep as the river was just beginning to flood. We abandonned it and went back the next weekend with a new plug, filter, gas and some engine start. Plus all the ropes etc to get this thing out and more than likely tow it home. But whatta ya know, kick kick kick for 20 mins and she started up and ran good as gold.

I'm definately a 4 stroke convert but the ol 2 strokes sure were reliable!

[barty5]

would a gn250 or 125 count with knobies fitted and new bars

[flyingcr250]

would a gn250 or 125 count with knobies fitted and new bars

should be pre 1980 and under 125cc's and twin shock:Punk:

[cave weta]

would a gn250 or 125 count with knobies fitted and new bars

Effin hillarious! I would race one!

[rardar]

How did this experiment go? In the process of doing all these things to mine hahaha.

Sent from my D6653 using Tapatalk

[hillbillyracer]

How did this experiment go? In the process of doing all these things to mine hahaha.

Sent from my D6653 using Tapatalk

How did you go with the AG100 tuning? I've just gotten hold of one for free and wondering what you've done. Thinking of tricking it up a bit..