Shimming question - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 6 (permalink) Old 02-11-2016, 12:27 PM Thread Starter
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Shimming question

Quick question about shimming.

Does anyone know if you can shim the head off the bike or does it have to be on?

On chain driven inline 4 it does not matter. But i thought it might because of the spring tension on the cam gears but i really have no idea for sure.

Thanks guys.

2003 RC
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1971 Honda CB500
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post #2 of 6 (permalink) Old 02-11-2016, 01:04 PM
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no reason for it to matter. the cams don't change position whether the heads are installed or not...


or maybe i'm out to lunch
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post #3 of 6 (permalink) Old 02-11-2016, 01:37 PM
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As long as the cam caps are bolted down, its all a matter of measuring the initial clearance and establishing a base measurement.
you only un-bolt the caps when you go to change the shims under the buckets.
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post #4 of 6 (permalink) Old 02-11-2016, 02:54 PM Thread Starter
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Exhaust were spot on. Intake was off on the low side of spec on one two were right on spec and one was out of spec on the high side at like .21 for some reason.

2003 RC
1988 FZR1000R
2013 YZ-450f
1974 Yamaha RD350
1971 Honda CB500
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post #5 of 6 (permalink) Old 02-11-2016, 04:42 PM
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I've tried doing this on VTR Superhawk heads in the past a few times. It may be just the slight distortion of the heads as you bolt them down, but sometimes the clearances, although close, are slightly different to what they were on the bench.

I've done it when selling heads and posting them out, shimming to within spec but telling the buyer to recheck when they're installed.
I'll post out a shim or two if they end up needing a slight adjustment.

It's not falling off, it's an upgrade opportunity
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post #6 of 6 (permalink) Old 02-11-2016, 07:07 PM Thread Starter
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Thats kinda what I expected. I noticed a slight difference. Usually tighter.

2003 RC
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2013 YZ-450f
1974 Yamaha RD350
1971 Honda CB500
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