They only rated the ss 440 at about 50 horsepower. They have a single carb and have small ports, but they run forever. He may get 75 out of it. Im also 220 lbs. --Speedo example--My arctic cat said 115 mph but my gps said 105 mph.
my 1980 ss440 ran strong until i ran lean on the clutch side and burned a dime size hole in the piston... time to rebuild... GREAT SLEDS! taking my 1980 exciter and 1980 ss440 to the 30 mile endurance race on march 12, hope to see u all there!
Well, look who's in the same boat. I over heated mine. Ran at 80 MPH for 4 MI, then stopped for a road. Then I gunned it again. Didn't have the same power. Melted. Don't know how bad, pulling the head tonight.
The yamaha's seem to be known for that we have a 85 excell III that did the same thing burned a hole in the pto piston to. Just got my ss 440 free and rotating but its only runnin about 35 psi on pto piston. So Im gonna rebuild it when I get some cash.