Hi mobileguru_2006, and welcome to the Forum.

You say you have derestricted the air intake and the exhaust, but have you checked/derestricted the inlet manifold? There should be a removable plate between the inlet manifold and reed cage with a very small hole - way smaller than the venturi of the carb, that needs to be removed.

You will probably find that this plate is still in place, and is starving the motor at high RPM, which in turn prevents you from reaching MAX speed.

I believe the NSR125R is undergeared from the factory too (I could be wrong - it's not my specialist field!) and can benefit from an extra tooth on the front sprocket. This will also increase your top speed, but sacrifice a little accelleration.

A fully derestricted NSR125R should be good for a genuine 90mph, perhaps a tiny bit more.
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Andy.
NSR-WORLD.COM

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