500cc shim clearance - Honda Rebel 300 & 500 Forum
 
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post #1 of 4 (permalink) Old 04-28-2017, 11:43 AM Thread Starter
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500cc shim clearance

My CB500XA had 14,924 miles on it when I did the first valve clearance inspection. All 8 valves were at or has slightly less than the minimum clearance. Accessing the valves (and spark plugs) was a bit of a hassle. I hope that the Rebel frame makes it easier (at least there is less tupperware).
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John '14CB500XA (Daily Rider), '09CRF230L (Li'l Red Piglet), '89NX250 (sold), '01Rebel250(sold)
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post #2 of 4 (permalink) Old 04-28-2017, 01:21 PM
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Did you change any shims, or leave them go?
It's OK to be a little on the loose side, but not so good if they're tight.
Loose will just give you a little extra noise (if not too far out), but too tight can burn valves.
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post #3 of 4 (permalink) Old 04-28-2017, 03:08 PM Thread Starter
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I am replacing all 8 shims, dropping them two sizes (0.05 mm) and ordering new Honda parts. The wear on these shims was much greater than on my NX250's shim under bucket shims which I replaced at about the same mileage. With that bike I reused the shims that I could. With this bike I am not sure if the shims were sourced in Thailand or Japan, but, I will have new Honda standard 7.48 mm shims to replace the originals (no reuse).

The CB500XA's chain is DID, made in Thailand. A lot of people had to replace their chains at 10-15 K miles. The nuts and bolts on the bike are frequently over-tightened in manufacturing. I am adding anti-seize to most of the running gear, but not in the engine. The point is that some of the parts are not the quality expected from Honda, nor is the assembly.

BTW, I am replacing the spark plugs with iridium plugs while I am in there. You have to pull the fuel tank and take out an electronics tray that lives under the tank to get to the spark plugs on my bike. Is the Rebel 500 easier to access?

John '14CB500XA (Daily Rider), '09CRF230L (Li'l Red Piglet), '89NX250 (sold), '01Rebel250(sold)
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Last edited by jsonder; 04-28-2017 at 03:13 PM. Reason: discuss spark plugs
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post #4 of 4 (permalink) Old 04-29-2017, 08:53 PM
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I don't have one.
And they're so new that I think the first ones just showed up in dealers in the last week or two.
I doubt if anyone has dealt with the spark plugs yet.
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