SOHC.co.uk Forums > CB500/550
Top end refreshment
bomber:
I started with broken tappet now it looks like a top end rebuild...
I'm about to remove cylinder block to replace gasket on the bottom of it, I would like to check if I need to replace piston rings and if pistons needs replacing.
How can I check if bottom end is in good nick?
Also, I have changed oil before this operation and did about 100miles, oil looks very dirty, there were clear signs of black deposit when I took rocker cover, and just have a look at the pictures of valves and pistons.
Interestingly when bike was running it didn't smoke, and form the pictures as suggested here before it must have done few miles, I would have thought that rings would be leaking oil and so it would smoke a lot.
Any suggestions much appreciated.
Off to shops to get micrometer!
florence:
I think the only sure way to checke the big ends is to strip them and use plastigage.
bomber:
Thanks guys,
I decided that I'm not going to attempt digging any lover than top end, I'm already way past my depths.
Very interesting point about the crescent mark, I had a look at the other picture and it doesn't look like the valve was hitting it, but will need closer look at it.
bomber:
Can someone please tell me what are these for? Also it looks like they should be screws, not nuts on top of studs with copper washers.
Any idea?
matthewmosse:
Think these bolts hold the rocker shafts in place. I was very surprised on my 500 and 550's that at the worst wear rate on any of my bikes I've only ever had to re ring them, appart from where dammage was really obvious, as in smashed pistons.
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