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Does anyone know how to tune a OS Max 12CVX with 10E carb? The instruction manual says the standard positions are: (i) low speed needle is 0.5 turn in from flush with carburetor body, (ii) high speed needle is 2 turns out.

When set with above, the engine wouldn't start as the low-end is wayyy too rich. I had to turn the low speed needle in 1.5 turns before it starts and idles. Also, when breaking in, the manual recommends to turn the high speed needle in 30deg with every tank of fuel for 5 tanks. So after 5 tanks, it would be only 1.5 turns out. Isn't that too lean?

I have another problem: when I start the engine it idles good where there is no wheel spin when I lift the car off the ground. However, after a brief run, the idle revs up to the point where the wheels spin quite fast and the car moves forward slowly by itself(abit like an automatic car without brakes applied). Any one have ideas?

I appreciate any reply. Thanks.