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Old August 11th, 2017, 05:51 PM   #1
TedBull
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Valve clearance range.

I inspected my valves at 8,500 miles and all the exhaust valves are out of spec. All the intake are in spec but on the tight side. I have the hot cams kit and will go ahead and just re shim all the valves I think. My question, is it best to shim to the middle of the specified range or on the loose end?

Exhuast clearance: .007 .011 .008 .006

Existing shims: .112 .113 .113 .110


Intake clearance: .006 .007 .007 .006

Existing shims: .114 .114 .111 .113

Note, all the shims showed slight wear and none of the size markings were legible. Measurements taken with digital calipers.

So who wants to help me figure out the new shim sizes?
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Old August 11th, 2017, 06:33 PM   #2
Flying
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Its common for folks to set the new clearance a bit loose because wear on the valves decreases the clearance. I personally think that isn't necessary and its just insurance against neglect.

So I'd say set it a little loose, not at the end of the spec, if you know you're not going to be 100% on top of the next adjustment. Otherwise, set it in the middle.
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Old August 11th, 2017, 07:39 PM   #3
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Flying makes a valid point. I'm a fan of the loose end of spec however. The difference between the tight end and loose end is so small in these engines that any performance difference is probably more in one's head than in reality. I'd much rather have a thou or two extra clearance than have the gap close up and unleash all the starting and warmup difficulties it causes.
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Old August 12th, 2017, 04:53 AM   #4
maverick9611
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Quote:
Originally Posted by TedBull View Post
I inspected my valves at 8,500 miles and all the exhaust valves are out of spec. All the intake are in spec but on the tight side. I have the hot cams kit and will go ahead and just re shim all the valves I think. My question, is it best to shim to the middle of the specified range or on the loose end?

Exhuast clearance: .007 .011 .008 .006

Existing shims: .112 .113 .113 .110


Intake clearance: .006 .007 .007 .006

Existing shims: .114 .114 .111 .113

Note, all the shims showed slight wear and none of the size markings were legible. Measurements taken with digital calipers.

So who wants to help me figure out the new shim sizes?
do you have a part# for that hot cams kit?
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Old August 12th, 2017, 08:09 AM   #5
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If you have the time to wait for shims, I'd recommend buying the individual ones you need instead of a whole kit. It's a lot cheaper, then only downside is the waiting time involved, since you have to measure your existing shims before you know which ones to order.

I purchased from https://procycle.us/hotcams/valve_shims.htm
Scroll down to the refill packs, it's $6 for a pack of 5 shims, I only needed 3 different sizes for my adjustment, $18 instead of $80+.

Of course if you ride year round, you might not be able to spare the time, I don't ride in the winter, so it wasn't a problem for me.
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Old August 12th, 2017, 12:27 PM   #6
TedBull
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