Originally posted by rancrs
the engine would be quite hot (dont have a temp gauge) and it does start right back up, i think it may be too lean, what are the best main and low end needle positions on a force .12?
I think you are right, you are running too lean and basically your engine flames out only after couple of minutes because of overheating.
Try this. With your current setting, ritchen the high-speed needle by 1/2 turn. Then run your car for a couple of minutes. If you experience that the car is bogging down during full-throttle runs then your low-speed needle is too lean. Test this by pinching your fuel line while the car is idling. The engine should rev-up for a second or two before dying out. If it doesn't rev-up then your low-speed needle is too lean. Ritchen it by 1/8 turn only. Run your car again, test and adjust your low-speed needle till you get your desired results.
WATER DROP TEST: After a couple of minutes running, put two or three drops of water at the heatsink directly around the glowplug. If it slowly sizzles, your engine temperature is at a moderate level. If the water immediately evaporates, your are running quite lean.