Originally Posted by pokiou
SO finally my R246 starter box arrived and i got the car going. HOWEVER its running really rich and i cant for the life of my figure out how to adjust it
if i let it idle it spits fuel out the back and i run out of fuel pretty quickly
This motor has two adjustment needles, the main fuel needle and the idle adjustment needle. The motor from the factory is set a little on the rich side for engine breakin reasons. Please see the engine breakin thread at the top of the threads page for good info on how to do the proper engine breakin. Depending on the nitro percentage of the fuel that you are using and the air density of your local area the main fuel needle will end up being set between 1 3/4 to 4 turns out from closed position. The higher the nitro % in the fuel the more turns out for the fuel needle will be required to get the proper air/fuel mixture. Also the hotter the air temperature the less fuel is needed an so the needle should be turned clockwise to adjust. The needle should be adjusted in very small amounts as it is very sensitive (think of a clock face sitting on top of the needle and make needle adjustments of only two hours each time you turn the needle). For example, I am using 16% nitro fuel and my needle is set at 1 3/4 turns out from fully closed.
The main fuel needle is next to the air intake facing upward. The idle adjustment needle is located on the right hand side of the carb near the engine heatsink. Turn the main fuel needle clockwise to close and counterclockwise to open. For the idle adjustments turn the idle needle clockwise to increase idle speed.
The idle needle should be set so that the engine does not cause the clutch to engage or move the wheels, but fast enough to keep the engine from stalling or stoping while the radio is at full brake. Be sure to use the idle needle to make this adjustment and not the trim on your radio. Also do these adjustments while the engine is at running temperature.