SOHC.co.uk Forums > CB500/550

What would cause this camshaft damage?

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SteveW:
Engine was running perfectly, I’ve only stripped the top end due to oil leaks.

Found damage to most of the lobes on the cam. There is no damage to the rest of the cam where it sits in the head and no damage to the rockers.
Also found this tiny disk of metal, about 2mm thick by 5mm diameter. Don’t think it’s part of the engine.

McCabe-Thiele (Ted):
I am no expert but there are a variety of causes my late father referred to that type of daage as "pick up" usually lack of lubrication associated with overheating, dirt or high mileage wear.

Google gives this cause. https://highwayandheavyparts.com/n-12843-camshaft-failure-analysis-what-causes-excessive-lobe-wear.html

Oddjob:
The cam can be repaired by Newman cams Steve. Cost last time quoted me in 2022 was £110-120 plus VAT plus postage.They hard chrome it and grind it back to spec IIRC.

However, if you are going to do that you might as well alter the profile as it's the same cost, Hondaman suggested adding 10 degrees duration to the stock CB500/550 cam (+5 early and late on the intake side, and 5 more degrees of exhaust overlap with the intake) will really perk it up.

SteveW:
Luckily I already have a replacement cam to go in. I’m going to stick a CB650 cam in, supposed to be a good mod for a little bit more power.

SteveW:
Forgot to say, the bike has 16500 miles supposedly from new. The rest of the engine looks perfect, there are no ridges on the inside of the barrels.

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