9 replies to this topic

[jumbostu]

Hi

Got a 225 kit (with kehein carb) to go on my sons 09 125 pro racing. Will I need a different base gasket? And is the flywheel weight a must have?? if so would like to know best place to buy the bits. (Cleveland)

Thanks in advance.

Stu

[Gasserguy]

I would ask Kev Hipwell at Gas Gas UK via the link below.....

http://www.gasgasuk.com/support.php

[TooFastTim]

Wouldn't you need to change the rear sprocket too?

[Gronno]

Yes you will, there's a method somewhere on tinternet to measure the squish when you first assemble it so that the right thickness base gasket is selected, its worth doing properly. I'd definately go for the flywheel weight, most 225ers seem to go for two! You will need the flyweheel cover spacer as well if you do this, but again I think its worth it.

[IKB]

Hows the 225 conversion gone? I will be doing one soon!! Did you change the gearing?
Thanks Ian

[spinner]

I'm running 10/44 and it works pretty well. I tried 10/42 but I was killing the motor far often.

My set up 10/44 gearing,delorto carb, long ti pipe, S3 head w/std insert, std flywheel weight.

Long Ti pipe really made a difference,better low end pull and with the 10/44 gearing made the stalling go away.

I would like to try the heavier flywheel weight but not available in the US. I have 24, 26 and 28mm flat slide carbs to experiment with next.

Edited by spinner, 04 October 2011 - 03:16 AM.

[sirhc]

Does the S3 flywheel weight only fit the bigger bikes and not the 125 flywheel?

[TooFastTim]

Blurb on the TrialEnduroDirect website says that a flywehhl is available. Whether it's the same as the 250/280/300 I don't know.

[spinner]

S3 flywheel weight will not work, flywheels are completely different. If you look on trialsenduro direct they list 125 flywheel weights click on it and they list one for the 225 kits

[IKB]

Just fitted the 225 kit for a friend, all seems fine, the bike is much livelier now and ready for a serious test.......Scott!!
One question, head bolts cut to length or tap the cylinder deeper? I cut mine shorter but it only leaves about 6 - 8mm of thread in use. It looked like the holes in the cylinder were drilled quite deep and would thread a bit further down but I has the cylinder on the bike and didn't want to risk it!!

Ian