Norm Peterson
corner barstool sitter
To be completely honest about it, a 300 lb motorcycle with a hard-mounted engine is going to be affected a whole lot more by the sort of 'wobbling' that an inline 3 inherently does. Balance shafting or not. I'd be curious as to how much visible vibration is associated with that 3, at least within a couple of frequency bands, and in how far it moves once a gear is engaged. Soft mounts almost certainly have to be part of the solution.
I'm not all that crazy about balance shaft solutions in general. It's only needed at all for engine configurations that are not either inherently balanced for primary and secondary forces and moments, or that can be completely balanced at the crankshaft. It's a solution for engines other than those, generally when displacement has outgrown the number of cylinders employed to get there. At 2.0L, an inline 4 is acceptable without them, but once you go above about 2.5 L they tend to need that sort of help.
Norm
I'm not all that crazy about balance shaft solutions in general. It's only needed at all for engine configurations that are not either inherently balanced for primary and secondary forces and moments, or that can be completely balanced at the crankshaft. It's a solution for engines other than those, generally when displacement has outgrown the number of cylinders employed to get there. At 2.0L, an inline 4 is acceptable without them, but once you go above about 2.5 L they tend to need that sort of help.
Norm
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