Having just traveled down the well worn path of searching for a top end refresh for my MC 11 ,the 56mm. bore makes it a oddball just like a 86 KX 125,I have decided to give the wiseco KX piston a try.Same nikasil,same wristpin,I might have to conture the crown profile or trim a skirt but it looks close.Am I just reinventing the wheel or has someone already ruined a perfectly good set of cylanders and can enlighten me.....lee

Be interesting to hear your results. We are looking at using cr125 cylinders as thats a good mod!

Paul
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More **** two strokes than you can shake a **** stick at.

i have an MC11
and i have cleaned the carburator
but it still starts slow at 1st gear at the begining then it lightes up like a rocket
and some times it dosent start i have to wait like an hour or some one has to push me
can someone help me please

Go to ns400r uk forum someone may led you to where to buy it. Their are couple people there own the 250's. Sadly to say your chances are very slim as 250/400 engine parts are all NLA