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Kawasaki MX & Off-Road Dirt Bikes
2T Engine experts -> your opinions on top end rebuilds
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[QUOTE="_JOE_, post: 1223334, member: 77507"] Generally the rule of thumb is when the 3rd shim is needed, replace the valves. 4t 250 pistons usually last an average of 50 hours, 100 for 450s. Average valve life is around 40 hours. If you are easy on it(like your son), you will get longer life. As redrodent said, once the valve tightens it indicates wear. Once it starts, it doesn't stop. If you're boy isn't an a-class racer, swap the valves/springs etc with Kibblewhites. They are good for a couple hundred hours, with a small sacrifice in performance. You seem interested in learning more of the why and hows of this hobby. I highly suggest buying Eric's book(s). I learned a ton from them, and this forum. There are alot of people on here that know what they are doing, and as you can imagine, some who think they do but don't. Hang around a while and you'll learn who to trust. [/QUOTE]
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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
2T Engine experts -> your opinions on top end rebuilds
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