We have a 79 arctic cat jag 3000 free air that won't run. Has spark good compression seems to be getting fuel.

Has spark, good compression, seems to be getting fuel, if you prime it, it will run and you can drive it sometimes but it never seems to running proper. Probably missing.???|||you probably need to clean the carbs and check the fuel pump. check the fuel filter and screen in tank. If you can prime the engine and get it to run you probably have a fuel system problem. make sure that you have good new spark plugs. replace the resistor plug caps on the wires they go bad just like plugs, and can cause weak spark. they are cheap and are often overlooked by owners and mechanics alike!! ones that old need to be replaced anyway many engines that have a "miss" that no one can find are from the caps. pay particular attention to the enrichening circuit on the carb(s) as this is important to starting also check the check valve in the fuel pump. if it leaks fuel runs back down away from carb(s) and causes hard starting(have to pull many times to start)|||Sounds liek the exact sypmtoms I experienced. I had a fuel pickup in a gas tank of that vintage develop an air leak. With the tank nearly empty, I presurrized it (with my mouth) and found it was blowing air at the tank exit - the 16" pickup in the tank had rotted...replaced and much better!

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|||check your fuel lift pump it could be on it's way out|||Needs a tune up take it to dealer or good mechanic.