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Not an 850 engine, but having used stock rods and pistons, JSM and MAP log rod and pistons sets in a 750, I'd say it is hard to tell much difference between the long rod sets. However, both long rod sets are better than a stock engine with all factory parts and a factory crank balance. An engine with stock rods and pistons, a "rebalanced crank", and a spicey cam is pretty hard to beat though.All of those configurations started out quiet and all of them ended up being noisy Norton.My preferred setup was with the JSM parts, but the bore was +.040 and the pistons higher compression.Forgot to mention JSM rods are a little longer than the MAP rods and the pin moved up in the piston to compensate. JSM rods are an improved design IMO, but I'm no closet engineer.
Not an 850 engine, but having used stock rods and pistons, JSM and MAP log rod and pistons sets in a 750, I'd say it is hard to tell much difference between the long rod sets. However, both long rod sets are better than a stock engine with all factory parts and a factory crank balance. An engine with stock rods and pistons, a "rebalanced crank", and a spicey cam is pretty hard to beat though.
All of those configurations started out quiet and all of them ended up being noisy Norton.
My preferred setup was with the JSM parts, but the bore was +.040 and the pistons higher compression.
Forgot to mention JSM rods are a little longer than the MAP rods and the pin moved up in the piston to compensate. JSM rods are an improved design IMO, but I'm no closet engineer.
