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Kawasaki MX & Off-Road Dirt Bikes
KX500 balanced crank?
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[QUOTE="69HemiGTX, post: 793853, member: 54620"] Thanks for the replies, y'all. I have recieved an email from a European quad builder who uses KTM 560 engines, and he said that he rebalances the cranks and rubber mounts the engine, which almost eliminates vibration. I think I will try the same approach, although I don't think "eliminating" the vibration is attainable. I expect to still have some, just not enough to make me reconsider the project. Most of it will come through the swingarm bolt because it cannot be rubber mounted there. I think that having the crank balanced will help greatly. I can understand why Kawasaki would have not been more stringent with their balance factor: cost. It would have been cost prohibitive to be very precise, so they just determined an acceptable range, and stuck with it. As far as my comment about "killing unborn children," I said that because the geometry of ATV frames tends to amplify harmonic resonance (vibration). I have ridden a drag quad with a CR500 engine in it (solid mounted), and it was like a paint shaker. Absolutely untolerable for long periods of time. My hands and feet were numb within two minutes. It was fun, but I looked like this: :laugh: Like I said before, I hate drag racing, so I will be riding for more than a few minutes at a time, so comfort is at a premium. Some of my ideas for reducing the vibration are balancing the crank, rubber engine mounts, Faast Company brass bar-end inserts, and rubber handlebar mounts. I understand that this will be a long and expensive process, but I am willing to do it. The ends justify the means in my eyes. Thanks again! I almost forgot this. Stupid question, but what is the maximum rpm that a 500 is designed to turn? I prefer bottom-to-mid power, so max revs for me will be down from peak. What rpm range would that put my engine in? [/QUOTE]
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Kawasaki MX & Off-Road Dirt Bikes
KX500 balanced crank?
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