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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
250F ring time, loss of power, gas in oil, cont...
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[QUOTE="Ol'89r, post: 597571, member: 17212"] nikki. If you have the engine apart, you may want to replace them now. The valve springs in this engine are not much bigger than a throttle return spring in a fitty. With the high rpms that the engine turns, I would think they would weaken pretty fast. If you shim them, you have to be careful not to pack them too tight. This can cause 'coil bind' and damage your cam. There should be a few thousands clearence between the coils at full valve lift. Also, notice the springs. Some valve springs have a heavy end. Or, in other words they are wound tighter at one end than the other. The heavy end or tight end has to go against the head and the light end goes against the collar. Sometimes you have to put them in a vice and sqieeze them down a little to see which end is wound tighter. Cant remember if the springs on the YZF are wound that way or not, but it's worth checking. Another little tip. When you install your cam, be sure to set the cam in the TOP cam holder journals first. DON'T set it in the head and then try to put the top cap on. Set it in the top cap and check to be sure the locating circlip is in place. Then, while holding the cam together with the top cap, place the whole assembly down into the head using the dowel pins to locate it. If you do it the other way, it is too easy to dislodge or get the circlip out of place thus causing misalignment of the cam and damaging the cam journals. Also, be very careful when torquing down the cam journals. Use a inch pound torque wrench for this. It only takes about 7.sumthin foot pounds torque for these caps so, it's hard to get an accurate reading with a foot pound wrench. Check your manual for the proper torque and don't go over this figure. This can distort the cam journals and damage the cam. Good luck. :thumb: 9r [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
250F ring time, loss of power, gas in oil, cont...
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