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KX100 big bore 107

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check for clearance but on my bike(bored 100) my engine builder shaved the valve

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I read on another site that the 100 is already over square and that the bigger piston puts more stress on the crank. I was just thinking that more cc's would help out my son offroad wise. More torqe, but since its already a big bored 85 maybe I should just redo it stock.

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I am in the process of doing my sons into a 107as well. And the answer to the PV Q, is yes, The PV only sits about 1.5-2mm from the cylinder wall, stock. Going to a 54.5mm bore will definately put the PV in the bore.

If your worried about stress on the crank and you're having the bottom end rebuilt, Get a Hotrods assembly = no worries.

Don't forget to jet for it too. You run it lean??? and kaboom!

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