The ZX1R story

[Skunk]

I purchased this bucket from Bistard. It appears to be an 89 ZXR250 running a total lost ignitioned ghey Honda GL145 engine. Everything was pretty standard (softer springs I believe and a little cam work).

I used it a few times at the Slipway, once at Taupo (The Taupo Road Race Spectacular), and once at 'the Minefeild' where I dropped a valve.

Badly.

1. at Taupo
2. at Manfeild
3. holy piston
4. head injuries

I have now, with a lot of help from Sully60 (thank you very much for your time), nearly got it running again with a (still ghey) Honda CB125TE engine bored to 142.7cc

Still has standard cams, head, ignition and carbs so we have a lot of potential to unleash yet. First on the list is carbs followed by head work or lightening the flywheel (lightened flywheel is sitting on the bench) and changing the ignition to electronic.

Stay tuned for the next report.

[koba]

gay Honda GL145 engine.

...

nearly got it running again with a (still gay) Honda CB125TE engine bored to 142.7cc

I belive it is "GHEY".

Good shit tho, awesome bike!

[skidMark]

My zxr can be purchased for 1k if anybody wants to do something similar (buggered motor)

all of it's there. new discs new pads blah blah.

[Buddha#81:Me]

My zxr can be purchased for 1k if anybody wants to do something similar (buggered motor)

all of it's there. new discs new pads blah blah.

Geeez for that sort of money you can buy TWO running buckets.

[Skunk]

My zxr can be purchased for 1k if anybody wants to do something similar (buggered motor)

all of it's there. new discs new pads blah blah.

That's quite a bit more than I paid for a very competitive bucket (in the right hands - ie not mine)!

[speedpro]

It's real easy to lighten the flywheel on a CB125T.

Remove the flywheel, remove the rear axle, screw the flywheel onto the axle, apply lots of heat to melt the aluminium(all of it), the magnets will fall on the floor with the aluminium. Hacksaw off all the sticky-outy bits of steel from the little centre bit, put the little centre bit back on the crank, put the rear axle back in. Done. worked on Doug's one anyway.

One of the best things I have seen done to a 125T is fitting a FZR250 ignition. 3-4hp with absolutely no other modifications. Olly Young's bike, John Connors dyno, back to back runs in the same night.

[Skunk]

Cool, I'll see if I can source a FZR250 ignition. I've already done the flywheel thing but I used a 80 tonne press. Only needed 18 tonnes to push it apart. Cleaned it up on a lathe.

[Skunk]

The motor is still in the tuning stage. Last meeting showed a slight miss in the mid range and up. At Sully's suggestion I changed the timing which helped a bit.

Since then I have fitted the lightened flywheel (woah! what a difference) and enlarged the mains a little (very little). Next weekend we shall see how she runs now.

[Slingshot]

This bike is awesome!!

I want it...or something similar.

[Skunk]

Had it out on the track today but there's still no top end.
Pulls nice and clean from the bottom of the rev range then goes flat at 50 or 65%. Revving higher it starts to miss.

I will be looking at the timing first, then the cam timing.

[koba]

Had it out on the track today but there's still no top end.
Pulls nice and clean from the bottom of the rev range then goes flat at 50 or 65%. Revving higher it starts to miss.

I will be looking at the timing first, then the cam timing.

So it wasn't the carbs/jetting then??

[Skunk]

Anyone able to help with cam timing?
I need to adjust the factory set-up. I'm not too sure on the process though.

[Sketchy_Racer]

two options. move it by one tooth either way. see if there is an improvement. That'll let you know your on the right track.

Then slot the cam sprockets. = finer adjustability.

[Skunk]

two options. move it by one tooth either way. see if there is an improvement. That'll let you know your on the right track.

Then slot the cam sprockets. = finer adjustability.

Cheers Sketchy, but one tooth is too far I believe. I'm not sure which direction to slot either. I think (98% sure) it's clockwise (the slots). I'd like to measure it first though.

[Sketchy_Racer]

Just a quick question, Have you experimented with your ignition timing at all?

Im still failing to see how the cam timing will have changed from stock, and even stock timing should be able to handle the increase in CC.

I'd slot it both ways. It doesn't matter and it's not exactly hard!