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Author Topic: M90 Exhaust Valve Timimg Question  (Read 7147 times)

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Re: M90 Exhaust Valve Timimg Question
« on: March 19, 2020, 09:13:30 am »
For some reason, my M90 seems to hit harder with more impulse torque with exhaust valve closing early about 25 degs Btdc with 0.012" lash on Coleman + 10% MMO fuel mix.
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