Hello there,
I have just bought myself a Sachs Optima with the 505 3DK motor.
I have also had a few problems with the motor and its power output.
Then i removed the exhaust and it was totally different. Then i found that there was alt of build up it the exhaust.
Could one of you send me a picture of your exhaust manifold.
Mine seems to have a strange homemade adaptor with the pin going straight across the cylinder outlet. so i think its causing too much back pressure, not allowing the engine to rev.
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