I am officially a squarenose owner. Pretty sweet deal for 850 got a 1990 superjet, protec rideplate, skat trak impeller, riva rev limiter, and a intake(I dont know the brand), a bunch of parts like a 701 case, 650 exhaust, mikuni carb, 2 stock heads, triton heads, MSD coil and a handpole with a beef-it kit(but has crack in it) I'll probably fiberglass both of the handpoles. I might buy the 701 stuff like the crankshaft, pistons and such its about 550 for all of it and then I'll drop the 701 in.
I am officially a squarenose owner. Pretty sweet deal for 850 got a 1990 superjet, protec rideplate, skat trak impeller, riva rev limiter, and a intake(I dont know the brand), a bunch of parts like a 701 case, 650 exhaust, mikuni carb, 2 stock heads, triton heads, MSD coil and a handpole with a beef-it kit(but has crack in it) I'll probably fiberglass both of the handpoles. I might buy the 701 stuff like the crankshaft, pistons and such its about 550 for all of it and then I'll drop the 701 in.
No need to buy a crank. The 633cc crank is the same crank the 701 and 760 yamaha twin engines use. If your on a budget, aren't we all the 61X 701cc engine is a good step up. Vick Parish and Kevin Posten in eastern Washington have had some good results with the 61X square nose. You need 61X cylinders, pistin kits, head, intake manifold, 61X cases and reed cage assemblies to make the change. Your crank, electrical, flywheel, carb, etc off the 633cc(6M6) can be re-used.
Joe...........
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850 was a sweet deal especially with all those parts!! 
Originally Posted by YamahaKid
the 61X 701cc engine is a good step up. Vick Parish and Kevin Posten in eastern Washington have had some good results with the 61X square nose. You need 61X cylinders, pistin kits, head, intake manifold, 61X cases and reed cage assemblies to make the change. Your crank, electrical, flywheel, carb, etc off the 633cc(6M6) can be re-used. 
Theskiclinic 
