Valve adjustments - Honda CBR500R Forum : CB500F and CB500X Forums
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post #1 of 48 (permalink) Old 04-28-2018, 10:23 AM Thread Starter
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Valve adjustments

Bucket and shim valves never need adjustment. They self correct and it is physically impossable for them to remain out if spec, and when out of spec, only by tiny margins will drift back.

Now you nut burger know it alls can break out the flame throwers.

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post #2 of 48 (permalink) Old 04-28-2018, 10:48 AM
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I just make a popcorn, sit back an watch. ;-)
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post #3 of 48 (permalink) Old 04-28-2018, 12:14 PM Thread Starter
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Lol....Houston we have a problem.
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post #4 of 48 (permalink) Old 04-28-2018, 01:49 PM
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Soooo to a newbie to bucket and shim setup explain why this is the case? Otherwise why would they be adjustable with various shims? And yes...... That is a petrol can in one hand and a match in the other lol

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post #5 of 48 (permalink) Old 04-28-2018, 02:22 PM Thread Starter
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The mechanics of the system will not allow the valves to drift out that far and as parts wear and bed in, allow the valves to drift back into spec. Its controversial subject, after many years checking them. Ive learn they are safe to leave alone. Not sure on this bike yet. We need more data.
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post #6 of 48 (permalink) Old 04-28-2018, 05:53 PM
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I've had three bucket and shim bikes before this one and all of them needed new shims at one time or another when they were checked at the recommended interval. I guess what you are saying is that if I had left them alone they would have drifted back into spec? Interesting concept that I never heard of before. It sure would be nice, but I don"t know if I'm willing to risk a burned valve to check it out.
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post #7 of 48 (permalink) Old 04-28-2018, 06:21 PM
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Cam lobes and the wear surface of the buckets can wear.

Valve faces can wear.

Valve seats can recede.

Clearances should be checked per the manufacturer's intervals to ensure neither is allowing the clearance to close to zero. To ignore this based on "ideal" theory that hardened surfaces will never wear and that manufacturer's clearances will never change is asking for performance reduction at best and a burned valve at worst.

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post #8 of 48 (permalink) Old 04-28-2018, 08:36 PM Thread Starter
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Ive seen bucket and shim motors go out to over 100,000 miles with no shim changes. The clearances tend to drift back when slightly out of spec. Not sure how this motor will do with that. Not enough data as of yet. My experience with triumph bonneville and a few kawasaki's found it safe to leave it all alone. Hope this bike is the same.
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post #9 of 48 (permalink) Old 04-28-2018, 09:35 PM
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It's unfortunate that misinformation like this gets spread around. It's so hard for a newbie to seperate fact from fiction that alot of them end up taking something like this as Gospel.
I'm a mechanic in a Honda dealership. I've seen 600rr's that have had over 100,000 kms and have not needed any shims, same as race bikes that have been used season after season,(also 600rr's) with no shimming required. However, as of last Friday, I just did 2 450x's that both needed to be set.
For any new rider or new mechanic reading this, please believe that regardless of what type of valve adjustment your machine requires, it will, at some point, need setting..
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post #10 of 48 (permalink) Old 04-28-2018, 10:20 PM Thread Starter
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I had a 450 and had to adjust valves all the time. They went south anyway. That 450 engine turns high rpm the reason why.
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