Originally Posted by
Nano
You don't need to heat up the engine before breaking it in.
Just run it rich for a couple of tanks and make it leaner so that it starts to have power after 3-4 tanks. After that, start fine tuning to get max power.
The pinch at the top is normal.
But with this one it gets hard when the top of the piston is level with the top of the exhaust port. won't it damage it?