Originally Posted by
Ice_nl
Ok, just got back from the track and i think it is solved, i noticed that there where some air bubbles in the fuel line and there wasn't going any fuel to the engine. When i put it on the start box and blocked the stinger i could get fuel to the carb and the engine would start. I put new fuel lines, fuel tank, exhaust seals and air filter on the engine and used the short plugs and it seems ok now. I just don't know what causes those air bubbles as i guess that may be my real problem?
The air bubbles in the fuel line are caused by a hot carburator. Methanol, the main ingredient of our fuel has a boiling point of 42 degrees Celsius. If your carb gets too hot, the fuel starts boiling and you get gas bubbles in the fuel line because the heat is being transfered through the fuel. Once you have the bubbles, there is no fuel going into the carb anymore.
This means that your engine is running on the hot side. Try to richen the bottom and the top needle and see if the problem goes away.