I bought my cousin a older 300 bayou last fall and he has rode the heck outta it. It's been a good atv for him but now it's acting up. It won't run, with the old carb I could hold my hand over the back of the carb and it would start up and run. But if you turn it off it won't start back unless you hold your hand over the carb. I took it apart and the diaphragm had holes in it. So I ordered him a new carb and it won't even start up. It's getting spark and it's getting gas to the carb, but it's not getting it to the plug. I can crank and crank, then take the plug out and it's dry. Anybody got any idea what the problem is?