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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Whats All This Fuss About Crankshaft Smoking?
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[QUOTE="cujet, post: 766382, member: 19501"] At work, I do some helicopter main rotor and tail rotor balancing. I have used my ACES equipment to learn about and modify the balance factor on a couple of motorcycle engines. In particular, I spent a bunch of time understanding crankshaft balance on my '94 Husky 360 2 stroke. What I determined (with velometers installed in both X and Y axis) is that changing the balance factor increases vibs in one axis and reduces the other. That makes sense if thought about for a bit. I tried various RPM's and found that there was an optimum point for my engine. Any deviation from the optimum point (about a 53% balance factor) resulted in higher vibes in one plane or the other. Vibes in the Y axis seem to be more annoying on my bike. No matter what weight I added, I could never make the engine smooth at a given RPM, which of course, I knew already. I was able to add weight externally to the engine, AND there was some improvement to be had. Still, my bike has plenty of vibration at higher RPM's Chris [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Whats All This Fuss About Crankshaft Smoking?
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