ESE's works engine tuner

[Gigglebutton]

Some old coot from Rangiora dropped of this old trail bike engine, its some kind of Kawasaiki looks a bip like the GP125style of things, any good for a bucket?

Thanks Warwick & Mike for your help. This will be Frankenstein's Kwaka. Built from the remains of bikes i have dug up and been given. A perversion in the eyes of the bucket gods, but hopefully with Wobly's help i can achieve the 40hp he has spoken of. If its as good as Robs bikes I'll be happy, If it,s better than his, I'll start cloning it. Fuck yeah, a two stroke zombie army

[gav]

Ohhhh 40hp now ???

[Gigglebutton]

Ohhhh 40hp now ???

Oops That should be 30hp.

[bucketracer]

Its fallen to me again to put the links list together for page 290, I have posted snippets of the interesting tec posts, you have to click on them to read the post.

If you look at the delivery ratio of a race engine, then calculate how much actual mixture is transmitted thru the transfers into the cylinder - compare that to the swept vol of the transfers, you realize that in most engines, what is sitting in the ducts is more than the vol going to the cylinder.,,,,,,,,,,,

Handy references …………….

Chambers sent me this link for those that might want to find a suitable rod, and I think they will even make you one to order.
http://www.samarin.net/?productos

re big ends tkrj list all the sizes for handy cross referencing there a link on here somewhere http://www.tkrj.co.jp/product/m-be-bearing.html
also useful for rings pistons etc cross referencing not sure about the quality but a useful resource.
Wiesco is also another useful resource for bearing sizes. Gudgeon pins crankpin sizes etc.
Also there was a post a couple of weeks ago regarding flash conrods euro based that have a useful reference for big ends and mains http://www.samarin.net/?productos
As a side note the sites for the honda rs125 offer replacement big ends now not factory but top spec.http://www.sp125racing.com/Performan...125%202011.htm

Another good source for big ends is Thompson - I use these in KT100 crank rebuilds as the needles are already graded.

Wobbly talks about how to achieve crank reliability, the posts are worth a read.

……… For some very wierd reason Rotax do not match any of the parts in batches to get the clearances correct………..

Most of the issues with the old cranks will be the cage construction of the big end bearing. The "new" design has a flat outer shape, with no indented rib to support the rollers………

All the common big end sizes are available in the newer flat cage design, as this type is used in all current road and race engines.

Posts also explain a little about Exhaust port duct design ………….. click the links to read it all.

as above found this on Honda rs125

And re the step in a Honda exhaust duct.
When using a T port or a properly designed tripple port exhaust, the area just outside the port is way too big during the blowdown phase,and alot of velocity is lost.
I have found that a good rule of thumb is to gradually reduce the duct exit at the flange, to around 75% of the total chordal area.

The nozzle is part of the Exhaust duct, you can weld the duct or counterbore it and press in a sleeve to be ground out to the right shape.

Removing the step from a Honda means you remove the oval nozzle restriction before the header, that increases duct velocity. Bigger is certainly not better……..

Electric power Jets

The modern take on powerjets is to turn them off after peak power to extend the rev range. This assumes that you are happy for your engine to rev that much further past peak power………..

With all the talk about wanting to utilize only a couple of gear changes per lap, I would have thought that the solenoid powerjet was a gift from heaven.
A late model well tuned RS125 will rev to around 12400 if the PJ is disabled, turn the PJ function back on and it will go to 13800+………..

Oh yea , ordered a piston the other day from Strike in perth, I ordered a 50.6mm so will end up at 101.75cc, oversizes are tiny so you only need to hone to the next size. About NZ$100 for a piston.

Devcon and JB weld…….

Depending on the setup you can use Devcon to glue inlets on. My RG50 had a (piston port) spigot shape into a round loose bore glued & it never failed after many many years …………

Mild steel pipes will always rust and or go black,the only way to help keep them looking OK is to use Castrol R. You have to rub it on with a rag every time the bike is run, and eventually it will burn in like a wok surface preventing rust, but you cant stop the header going black.

Wobbly talks about replacing the function of a stinger with a nozzle, it’s an informative read.

The rear cone nozzle in the old Honda manual is well out of date.
A later version was developed by Helmut Fath and was first used on Fast Freddys 250 where one stinger was 150 long the other was 450 long.

[husaberg]

Some old coot from Rangiora dropped of this old trail bike engine, its some kind of Kawasaiki looks a bip like the GP125style of things, any good for a bucket?

is it 6 speed?
I remember there was a road race bike back in the late 70/s or early 80/s made from one of these for a top racer before he made it big from chchJacks motor cycles with Jungle mcgreggor for a young Brent Jones who did internationals later on in asia anyway it had a genuine RG500 road race top end grafted on he did real well on it.
but I supose there was only MT125s and TA125s and modified chook chashers in the 125 class then.The bike was as described but was in fact assembled at Jacks Motorcycles for Brent Jones he was unbeatable on it for the couple of years that he raced it78-80 ish Interesting I have never seen one in the flesh if it is 6 speed and i think they are 50mm ish stroke unlike the 90/100 it would have an advantage over a gp100/125 they are 5 i think.Pete Sales had a rg400 barrel on trademe.

Also if anyones interested i have a parts manual for the h100 don't know where to host it as a pdf though

reputably

[TZ350]

.

Is Speedpro cheating? as it turns out, its........

Not to hard at all to make a legal GP100 using a KT100 piston.

And expect its much the same deal for an MB100

Checked into this idea of using a KT100 piston and 0.75mm offset pin to make a 100cc screamer.

The GP125 has a 19mm big end pin and the KT100 has a 14mm piston pin.

Now I need a bigend pin that can be ground off set by 0.75mm and a 22mm pin would do for that.

By searching the on line catalogues I have found that the later model GP125 X4 popular in the Philippines has a 22 B/E-14 L/E rod,

In fact there are all manner of road bike rods with these dimensions.

TKRJ GP125 X4 Rod Kit http://www.tkrj.co.jp/goods/m-BS0275A--36A10.php

This TKR site is a good resource for searching out piston/rod/bigend brg dimensions. So basically anyone could make a legal 100cc engine using a KT100 piston.

The Suzuki GP125X4 bikes are popular for sprint racing in the Philippines

[husaberg]

[QUOTE]

.

Now I need a bigend pin that can be ground off set by 0.75mm and a 22mm pin would do for that.

Akunar here http://www.akunar.com/STROKER_CRANKSHAFTS.htm list ready made strokers pins for all sorts of bikes the offset is off couse dictated by the position of the crankpin in the crankshaft the stroke lengths options are within reason limitless

[speedpro]

That rod is 100mm centre-centre, mines 105mm. Wobbly said to get a longer rod. It took a bit of searching. You need the 22mm BE pin so you can slip the rod and bearing over the offset.

[ac3_snow]

Akunar here http://www.akunar.com/STROKER_CRANKSHAFTS.htm

I was warned off their conrods, I think another buckateer used an FXR one from them with not so good results.
p.s. link is broken, one too many 'http://'s

So is the offset pin purely to reduce the stroke? I'm assuming this is because you cannot get a shorter conrod with the right dimensions?

[speedpro]

[QUOTE=husaberg;1130091419]

Akunar here http://www.akunar.com/STROKER_CRANKSHAFTS.htm list ready made strokers pins for all sorts of bikes the offset is off couse dictated by the position of the crankpin in the crankshaft the stroke lengths options are within reason limitless

There's been some discussion about those pins. Evidently the split big end bearing cages don't hack it. I think it was tried in a really big FXR.

[husaberg]

[QUOTE=speedpro;1130091428]

There's been some discussion about those pins. Evidently the split big end bearing cages don't hack it. I think it was tried in a really big FXR.

can't vouch if there any good but I guess the dynamics with a smoothfiring 2 stroke vs a Intermittingly firing four stroke might not rule them out completly yet anyway.
I personally would steer clear of any rod not oem factory or euro usa anyway to much at stake with the rod.

Of course the other way without resorting to off set pins is the top hat bush method where a offset hole is bored into crankwheel and then a bush is inerted allowing the std cranpin to be used.of course it has to be secured well and super acurate.

fixed the link to

for the record i have never really thought personally speedpro was cheating end of the matter me and mike have already settled this I think

I guess you have you considered the changes the piston and all the rest of the changes could make to your port timmings?

[ac3_snow]

So is the offset pin purely to reduce the stroke? I'm assuming this is because you cannot get a shorter conrod with the right dimensions?

Ohk now that I actually think about it, the conrod length does nothing to determine stroke length, the diamter of the crank and location of the crank pin determines how big a cricle the bottom of the conrod spins. So the offset crank pin gives you bigend which spins a 'smaller circle', and therefore less stroke.
Please continue to ignore my foolish questions

[TZ350]

Thanks to Wobbly for some pointers, the Ignitec and RC servo idea now functions.



Wob gave me some ideas on how to try setting the Ignetec software switch up.



Then I wired a light in, easier to see whats going on that way, and tested it.

Now this is what I want the IgniTec and RC servo to do at 6,000 rpm http://www.youtube.com/watch?v=FeB9O6rtLXQ actually I dont want it to flap, just open at 6,000rpm

Testing the Ignitech switch with a light http://www.youtube.com/watch?v=4RSHXNYt6Oc

A bit dark, so you will just have to take my word for it. Here is the Ignitech switching the V Tec RC Servo http://www.youtube.com/watch?v=ar8YST2TYjQ

Everything is functioning as it should, next step is to give it a bit of dyno time and see what we have after a few adjustments.

[kel]

That rod is 100mm centre-centre, mines 105mm. Wobbly said to get a longer rod. It took a bit of searching. You need the 22mm BE pin so you can slip the rod and bearing over the offset.

105mm rod with 22mm BE? Thats easy same as installed in my KE. There were two different lengths for different years (100 and 105mm) but if its hush hush then mums the word.

[F5 Dave]

.

Is Speedpro cheating? as it turns out, its........

Not to hard at all to make a legal GP100 using a KT100 piston.

And expect its much the same deal for an MB100

Checked into this idea of using a KT100 piston and 0.75mm offset pin to make a 100cc screamer.

The GP125 has a 19mm big end pin and the KT100 has a 14mm piston pin.

Now I need a bigend pin that can be ground off set by 0.75mm and a 22mm pin would do for that.

By searching the on line catalogues I have found that the later model GP125 X4 popular in the Philippines has a 22 B/E-14 L/E rod,

In fact there are all manner of road bike rods with these dimensions.

TKRJ GP125 X4 Rod Kit http://www.tkrj.co.jp/goods/m-BS0275A--36A10.php

This TKR site is a good resource for searching out piston/rod/bigend brg dimensions. So basically anyone could make a legal 100cc engine using a KT100 piston.

The Suzuki GP125X4 bikes are popular for sprint racing in the Philippines

Hey TZ that's a pretty wiked tank mural on the last GP there. Tyres don't fill me with much confidence either. How that's straight line stuff.

As far as Speedpro cheating -I have to say I never inferred that, I've pretty much known how he has built his engine for quite some time, as he does mine & there isn't anything queer in it I am aware of, just some carefully considered engineering.