Two shims in bucket...did I bend the valve? - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 13 (permalink) Old 06-05-2014, 04:34 PM Thread Starter
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Two shims in bucket...did I bend the valve?

Hey guys, I made a STUPID mistake yesterday during a valve adjustment on my RC and had TWO shims in the valve bucket while I turned the motor over...stupid me forgot to check that the old one was stuck underneath. The question is, did I bend a valve or am I am all set? I'm of course quite worried after I figured out what I did. All input appreciated...thanks in advance!
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post #2 of 13 (permalink) Old 06-05-2014, 05:09 PM
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did it make contact with the piston? did you turn it over by hand?
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post #3 of 13 (permalink) Old 06-05-2014, 05:20 PM Thread Starter
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That's the thing...I'm not sure if it made contact. And yes, I did turn it over by hand.
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post #4 of 13 (permalink) Old 06-05-2014, 05:24 PM
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Did it feel like you really had to force it to turn over when you did it by hand? If not then you are probably good. Do you have a leak down tester? I would do that and see if it's sealing good. They are like $40 from harbor freight.
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post #5 of 13 (permalink) Old 06-05-2014, 07:16 PM Thread Starter
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It did feel hard, but not sure if any harder than normal (left plugs in). Leak down tester is a good idea, I do have one.
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post #6 of 13 (permalink) Old 06-06-2014, 12:44 AM Thread Starter
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Well my leak down tester is junk, so ordered one and have to wait for it to come in Until them, anyone else ever do this or have any input? Does anyone know the (OEM) piston-to-valve clearance?
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post #7 of 13 (permalink) Old 06-06-2014, 10:20 AM
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how thick are the shims you had in there? probly be ok considering people dropping in high lift cams with factory pistons.

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post #8 of 13 (permalink) Old 06-06-2014, 03:54 PM
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Did you check the gap with the old shim prior to the work?
If so, just fit the old shim & check the gap. if its bigger. Then you've bent the valve. If not. Then its happy days.


inlet clearance = 0.16+- 0.03mm
Outlet clearance =0.31+-0.03mm

Last edited by pbc0; 06-06-2014 at 04:07 PM.
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post #9 of 13 (permalink) Old 06-06-2014, 05:14 PM
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On i side note, how did you manage to fit two shims in one bucket?

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post #10 of 13 (permalink) Old 06-06-2014, 05:40 PM
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Quote:
Originally Posted by RickyBobbyv8 View Post
On i side note, how did you manage to fit two shims in one bucket?

I was kinda wondering how you missed that. After you put the new shims in, you would normally recheck your valve clearances before buttoning it all up again. Did you just forget to check one of them?

John, 2000 RC51 #000100

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