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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
CR450F Top End Update
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[QUOTE="SFO, post: 391766, member: 21864"] Honda has done an excellent job at making their parts affordable in an effort I believe to get people to adhere to their maintenance schedules. I think the cassette head is a great idea. It also stops the head rebuilders in their tracks when a new head is so cheap. The honda valves are also designed to be replaced, not refaced, so you must replace them too. I believe with the current crop of ti valve heads the engineers have pushed the envelope as far as seat pressure and valve acceleration. The result is that when these springs get tired they no longer control the valve properly and the errosion of the face and the seat is accelerated. I would/and do, replace my valve springs with every rebuild. The yamaha springs are cheap, less than 10$ each. There are many spurious viewpoints regarding blue vs. red and 2vs.4 stroke and I think perhaps the real issue Eric was commenting on was how surprised he was that the honda parts were affordable compared to yamaha parts in regards to a bare head. It seems that two the most frequent topics I see on the 4smoke boards are I don't need to folow the service schedule because my motor is in spec, and my motor blew up honda/yamahas are junk. The measured specifications are not the end all for the service intervals. Service life=fatigue cycles on things that cause catastrophies. Rods and valve springs are two items that replacment (I believe) is the only way to insure non-failure. Heck a complete cr-f crank is only 200$ right? It is a real can of worms to create your own service schedules. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
CR450F Top End Update
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