possible new valves needed

well, i just checked the numbers on my valve shims and most of them are around 2.30 and 2.40, my valves are extra tight right now and i may have to use 2.20 or even smaller shims, the problem is they only make the 29mm shims down to 2.00.

anyone know where a cheap place to buy valves is, or anywhere to get extra thin shims????

i wouldn't be to concerned about allot of guys will cut the seats and valves so that they end up in the middle of the shim range one half size eg. 235 is 002" thinner than a 2.40.so you have plenty of shim sizes to go lots of adjustments to go you can't get them any thinner than 2.00 because if they were smaller the cams would either spit them out or break them. will the buckets spin if you try moving them by hand.

jswag5 wrote:

well, i just checked the numbers on my valve shims and most of them are around 2.30 and 2.40, my valves are extra tight right now and i may have to use 2.20 or even smaller shims, the problem is they only make the 29mm shims down to 2.00.

anyone know where a cheap place to buy valves is, or anywhere to get extra thin shims????

I don't understand why you need new valves. If the shims are too THIN, the valve ends can be ground to get the shim size into the middle of the range. If the seats are cut too deep and you can't cut the valve ends any shorter, new valves won't help.

sometimes over time and according on how hard the bike is ridden the stock valve faces will receed so sometimes you do have to replace valves.

Just tip the valves. If you have no way of doing this, send us the head.

Jay

thanks for the information, i will see what happens, if i have issues i just realizedm i have a full head with valves sitting here i can take valves out of if needed,

what people are saying is the valves are probably fine, the valve seats in there heads tend to wear and that's why it is tight.

To make it work again in spec, you need to have the valves pulled out and ground down a little. It is a easy job for any local machine shop. Or you could get APE to do it if you want to know it is done right (maybe spring for a little port and polish while the head is there...)

Timebomb is right on the money

You many need new valves but just because you're on the low end of the shim range doesn't suggest that.

If you can spin the buckets, then you have clearance. Being at 230 - 240 shim range leaves you more than enough to work with for adjustments this riding season.

Check compression on the motor now and after the valve adjustment.

Do a leak down on it would be even better.

If things look good, ride it till fall. Then give it a good going over. You may be able to save the valves you have by refacing them and tipping them.

95% of the KZ heads I get, I can reuse the stock valves. Old bronze guides were junk. The later iron guides last a very long time..

Larry C