Klx250

[1022racing]

Hello my name is Brett,firs timer on ozvmx,read a lot though,I recently picked up 3 79-80 klx250s and would like to do motor work,after reading all of your posts,derail gave part# for wiseco 72mm piston,cam,,also valves and springs,but not sure which carb to use,derail was running a 36mm but I don't know what brand or model also interested in stroking motor as derail did but do not know which rod he used? Just in the planning stage could use some good advice from someone who has already done this thanks Brett

[bishboy]

Hi and welcome 

A few guys on here have KLX's and will be able to help.

Have you read this:

http://forum.ozvmx.com/index.php?topic=102.0

[1022racing]

Yes I read all of klx250 a shared disease,a lot of good info,still doesn't talk about stroking bike or carb size make and model ,everything else is spelled out,also concerned about weak gearbox,vmx42 said it has something to do with drop in mechanism,has anyone repaired problem or found weak spots? Thanks Brett

[cloggy]

 From what I've gleaned stroking and boring turns the gearbox to glass. Remember this was originally a Z200 motor  I've heard the hot ticket back in the day was a Dell Orto but the engine is over carbed anyway. It's running a very similar carb to the SP370. Boring to 72 and raising the compression with a revver cam is the way to go