I'm terrible at troubleshooting, but what happens when you try starting it? Does it crank over? can you pull the cord? R/N lights come on? I'll try to help and could use Yours in return. We both have the same Quad. It would be a great help if you could simply look at how the 2 hoses coming from the radiator connect to the oil pump? Lets see if Two heads are truly better than One.