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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: 1223357, member: 77507"] The timelines I used are straight from Eric's book. I bet he has seen enough to set a basic recommendation for replacement. He says the valves stems stretch and cause the tightening(as well as seat/face wear). If allowed to stretch too much, the valve heads can actually break off :yikes: . I have done an enormous amount of research on 4t's as my crf is supposed to be hard on valve trains. I have about 25-30 hours on it and the valves have yet to move. Some have issues from a very young age. I tend to think its more of a maintenance issue than a part quality issue. I, being paranoid about my engine, change the oil every ride, filter every other oil change, and trans oil every other oil change. I have two air filters and always swap for a fresh one every ride. Too much? Maybe. But better than not enough. I plan to change the valve springs this fall, and depending on if there is any movement of the valves, I will go Kibbelwhite at that time. If thats the case the piston will be changed as well, as I don't want to have to tear it apart again to do that. If so, in goes a high comp Wiseco. I have been eyeing up the top end packages from Eric, they look like a great deal. Box up the head, send it to him, wait a couple weeks and put it back together. So anyway, go get the book and read up on here. It won't be long before you have a good grasp on what's going on in that little thumper motor. [/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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