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Thanks I will try those things. I have tried the reed valve with no luck but have not tried removing the exhaust.

not Sure I have not taken it apart yet to look. They seemed like they really needed to split it

Thanks for the response I understand what you are talking about buddy that owns a repair shop really feels it’s crank seals. not Sure how hard it is to split the Sachs motor but will do the pressure check and if the seals leak we will look into splitting it and putting crank seals in

I have a buddy working on it. Not sure if timing has been checked. I know compression was good in the top side. How would you go about pressurizing it to check crank seals

I have a 1971 arctic cat prowler mini bike with a sachs 50 motor in it. It will start and idle fine but if you give it some throttle it barley has enough power to turn the tire if it’s off the ground. We have tried a new carb and spark plug with the same results starting to wonder if it is...