SOHC.co.uk Forums > CB500/550

When is a motor not worth working on?

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alexdecker:
Hey

Ok, så got this CB550F. It had some top end work done, and it runs fine now. The primary chain is loose and needs to be changed, and contemplating doing a major restoration of the engine.

The old lady has 80000 km on her (yes, that was five zeros). Do we have some sort of guideline as to when the engine is not worth working on anymore? When do you just run out the life of the bike, and when do you continue to restore?

- Alex

haynes66:
my trusty cx500 did 160,000 before the shaft drive gave up. if it runs, use it

Sesman:
My only concern would be leaving the chains and tensioners too long and inviting a catastrophic failure.

The big question is what are you prepared to replace when you are in the motor?

I replaced all bearings, bearing shells, seals, chains, rings and tensioners. My valves, guides, cams and cam bearing surfaces and bores were in fantastic condition and only required lapping and honing. I still spent around £700.

I get the satisfaction, but the next owner gets the benefit.

So I guess the answer is run it, but don’t break it.

Johnwebley:
80k is only 50,000miles ,

Nothing for these motors,

Mine is into the 70k,and running sweetly


Sent from my SM-A750FN using Tapatalk

Sesman:
I suppose it depends on the type,of miles and the type of owner.

Alex tells us his cam chain is cooked and I’ve read many reports,on this forum of primary drive chains been goosed at 30k and eating into oil galleries?

I wouldn’t know as I’m not expert, but can only report on my engine strip at 17k. Miles. I’d say there was nothing seriously wrong, but the cam chain was deffo at the end of adjustment and the primary drive around 70% worn.

Again, maintenance is the key issue…oil, balance and adjustment. Use, but don’t abuse.

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