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Dirt Bike Discussions By Brand
Suzuki MX & Off-Road Dirt Bikes
used 05 crf450 needs a good once over
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[QUOTE="Ol'89r, post: 1399549, member: 17212"] You have to disable the Decomp to get an accurate compression reading. You should never bump start your bike if it won't kick start. (Referring to the current crop of fourstrokes). If the bike won't kick start, it is usually an indication that the valves are tight. If you bump start it and run it anyway, you could do damage to your valves and head. Your valves have a Titanium coating on the seat face area. Once that coating burns off, your valves are junk. If the bike is operated without the necessary valve clearance, it will burn the valves and possibly damage the seats. I would stick with the recommended valve clearance rather than take the chance of running them too tight. Your assumptions of how to check the valve clearance is correct. You can buy the whole shim kit or just the ones that you need. It is very convenient to have the whole shim kit available. They cost around 80-90 bucks. You can check the condition of your valves by disabling the decomp and doing a compression test. If you compression is low, you will have to remove the head and physically check the valves. Pour gasoline into the intake port and then into the exhaust port. If gas leaks past the valves, you should remove them from the head and inspect them. If they are burnt, it will be obvious to the eye. IMO, if you are unsure of the history of the bike, you should go ahead and replace the valves, valve springs and guide seals. If the valves have too much time on them, they can break and lose their heads. If that happens, it will cause a lot of damage to your engine. The piston and rings should also be replaced. Find someone with experience and the proper tools to do your valve job. It is critical that it be done right. Check your cam chain and guides also. A good way to go is the Kibblewhite stainless steel valve kit. They will outlast the standard valves and can be ground and re-seated like a normal valve. Be sure to use the Kibblewhite spring kit with the SS valves. A factory service manual will be a big help. ;) [/QUOTE]
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Dirt Bike Discussions By Brand
Suzuki MX & Off-Road Dirt Bikes
used 05 crf450 needs a good once over
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