Yoshiyamaha68

I have a 1987 js550 full mod.. bigger sbt pistons, full westcoast pipe, west coast exhaust manifold, marnier waterbox, light weight flywheel, pjs dual cooling head, ocean pro nosel, solas impeller, bn44... im having overheating issues.. i have blown all the cooling lines out with the compressor, the impeller seems to be tight to the wear ring.. i have water shooting out the pisser but i have no water running through my exhaust.. all i can think of is maybe the head is clogged... any idea's.. summer is almost over i need to get this thing going..