Originally Posted by Hesky
you weren't far wrong though BT, if you lower the rpm you lower the friction between the piston and sleeve, bit like rubbing 2 sticks together to make fire lol the faster you rub the hotter it gets. I think what nitro dude meant is if you gear the car to hi it will put excess load on the clutch assembly and over heat and in turn raise the temperature of the engine.
I wouldn't bother with different gear ratios, just use the one that suits your track. just shim it as daniz24 said and run it a bit richer on the top end. also make sure the body is cut to give good air circulation for the engine to keep cool.
thanks Hesky yea i believe i have the right gearing for my track as its a small to medium size track, 2 netball courts.
if i richen my top end just 1/8th of a turn it goes back to being a bit rich. and problem with these stock kit motors (vones 3) if its slightly rich it wont kick into 2nd gear nicely. and the difference between slightly rich and perfectly tuned engine is about 1/8th of a turn on the top end screw.
Also engine is only about 1 litre old so still brand new. maybe i might need to keep running it in.
will update how i go
thanks once again guys cheers