Bucket development: A few questions for the wise ones

[speedpro]

I thinned a 428 sprocket to 420 recently using a linisher (spelling?). Worked fine and didn't take too long. It's easy enough to get good enough. Only remove material from one side.

Flat top ports are not ideal, check the ESE thread. The exhaust is going to need a curve on the top, so if you keep the same max height you will end up with less exhaust time/area and less blowdown. The width really is on the edge of what's acceptable so you will have to be careful.

[bucketracer]

I’m struggling to get one of my main bearings off the crank.

We use tire levers, put the curved end of the leavers under the edges of the brg and leaver it up, works a treat.

[Yow Ling]

We use tire levers, put the curved end of the leavers under the edge of the brg and leaver it up, works a treat.

I use a bearing splitter , and give it a squish with a hyd press

[koba]

I use a bearing splitter , and give it a squish with a hyd press

I couldn't afford one so made one, it was just mild steel so is a bit ragged now but I can regrind the face every now and then and that keeps it going. Not that I need to now that my brother bought a proper one...

[gatch]

Hammer and cold chisel maaaaaaaaaaaaaate.

Off topic I know but..

I have seen sledge hammers being used on big diameter bearings.. I died a little when I saw it.

[F5 Dave]

yeah 420 to 415. Easier on the ally sprockets. Front steel ones are hard as hell so I;ve paid someone to do it. Just do one side as Mike sez, but do radius the edges of the teeth again or it will do bad things, or at best make a terrible noise. Think my bearing remover was $70

[Bert]

My God its nearly a year; but we have an aim to have it all finished so I can race it at the GP.

The story thus far (for those that don't want to go back over older posts).

The Engine:
TZR125 4DL sleeved down to 50mm running YZ100 pistons (not ideal but after destroying a couple of RG400 pistons to deal with the larger 16mm pin, i had to do something).
cleaned up the ports (still need work but for now its rough enough to get things going); the lack of skill and the real tools to completely sort out the transfers is the real hold-up here; but it will just have to do this time around.

Griffiths engineering Palmy made a fantastic job on my inserted head & o-rings (using the standard head) and using one of my KTM125 inserts as a guide/template (before anyone else asks). Still need to cut the squish and combustion chamber into the blank once the entire motor is back together. Also some work has been done on my crank/casings to enable the use of normal 17mm width main bearings (yamaha uses these stupid 16mm ones that are gold... well cost the same as) there is a little more to this story but it too boring to full you all in on now... I really Thank Dave G for his patients on this (lucky he is an ex-bucket racer from way back and thinks this is all a little nuts).

Exhaust:
Modified RS125 nearly meets my basic calculations using a combination of MacDizzy/mota/jennings and even Bell (those with the fancy software will surely tell me I've cocked this up... if you are willing to help let me know; I'm completely stumped now). I've been loving the information that Frits Overmars, TZ350, Wobbly & Speedpro (and other) have been contributing to the ESE tread (that really is turning into god mine) and I've been re-reading the key elements relating to porting and exhaust design (please keep it up).

Electrics:
Ignitech (thanks Wobbly), standard rotor for the mean time; probably going to be total loss until i get my charging circuit and light weight rotor sorted).

Carb:
wont really know until its all back together but have options from 28mm-36mm (think I'll be starting with the 28 and seeing how she runs).

Rolling Frame:
well the cats is out of the bag on this one... Crazy Man has been building a TZR250F3/TZR100F4 work of art, it is F##Ken gorgeous in my eyes every time I've seen it I'm amazed with the quality of the workmanship; this is based around a RS125- forks/swingarm&Shock/wheels (shit that has been sourced cheap over the years).
the motors can be swapped out relatively quickly; this is still work in progress.


So there you go; we have a little to do like get the motor back together and sort out the Carbs and final'ish pipe & get the ignitech up an running; sort out the tank (and fairing for the TZR250F3 and GP version maybe) and nylon it up. the question is; is two months long enough to get it sorted for the GP?????? time will tell but I'm getting all pumped up now for the first time in ages...

here's a few photos to sort of show the fore mentioned progress (please don't take them as the finished product rather work in progress shots I haven't got that many of the more up to date engine progress).

More to come no doubt or hopefully I'll see some of you at the GP.

[Brian d marge]

looking good , be very interested in how it goes

Stephen

[jasonu]

What tubeing is that very nice frame made from?

[Kendog]

Great update, can't wait to see it in action.
Now that you other little project is completed you should have plenty of time to finish

[Bert]

What tubeing is that very nice frame made from?

Not 100% sure (its thin wall steel tube) type? no idea sorry, that's "Crazy Man" speciality.
She's light though; it is approximately the same as my 1995 TZ125 4Jt frame (+/-0.5 kgs)..

The great thing here is that none of the GP running gear has been modified to do this; so maybe (and it will work); there is another option rather than cutting up GP bikes.
Take GP bike the running gear off, build a frame, bucket race it, get sick of it and put the GP bike back together and preserve some racing history rather than loosing it...
food for thought.

Great update, can't wait to see it in action.
Now that you other little project is completed you should have plenty of time to finish

heeehee Nothing like a planning wedding to slow down bike building progress... shes all go now though.

[F5 Dave]

Waaheyhey. Lookin good. a little too good. Will be good to see you with a hopefully reliable bike to race.

oh yeah congratulations btw.

[TZ350]

Looking good Bert ....

[Rick 52]

Take GP bike the running gear off, build a frame, bucket race it, get sick of it and put the GP bike back together and preserve some racing history rather than loosing it...
food for thought.

Looking great !! I have just been looking at putting a CBR 150 into a RS but would have to cut it and I just carn't do it ! They are way to nice to be buggered up ...

[richban]

Looking great !! I have just been looking at putting a CBR 150 into a RS but would have to cut it and I just carn't do it ! They are way to nice to be buggered up ...

Seems that there are lots of builds on the go at the mo. Just get one of these Rick. Plenty of room. Frame, Forks, Front and rear Suspension bolted up 23kg. With the FXR engine and RS wheels it should be 85 ish. The small wheels will look a little lonely with the big swing arm but the rest should look great. Planning on running RS250 fairings.