Just bought a 86 yz490. I fixed a couple minor problems, but its really hard to start. It takes about 15 minutes to start it. Runs pretty well once started though. I took off the carburetor, looks good inside, i could see most of the reeds, they seemed ok. Sometimes i can turn it over 5 or more times before theres enough compression to have to kick it. Its like a valve is stuck open, but its a 2 stroke. I put a new air filter on, put new gas in it (32:1), and i checked the plug, looks new, however wet with fuel. Help please!