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Doms CB550F1 project
Nurse Julie:
This is what Trigger did to my bike as I also had bits missing, so all I've got is the bottom part in the air box, the same as you have, I have a 550 air filter, of which there is two types and a made up lid.
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DomP:
Any thoughts on my low compression results folks?
McCabe-Thiele (Ted):
If you are concerned about the compression readings after you have checked the valve clearances it might we worth trying some oil down the bores then re-check with all the plugs out.
If its piston related they should come up massively, if little change might be the valves need re-grinding.
Trigger:
--- Quote from: DomP on August 26, 2023, 08:22:58 PM ---Trigger-
--- End quote ---
Ok Dom, it is a 323 hub. I must have one in one of the store rooms. Will have a look for it and get back to you ;)
Oddjob:
If fitting the 500 filter is a problem in the 550 air box just replace that part with the 500 version. CMS have 3 new ones in stock for around £30 each.
It seems a little bit of overkill tbh but the 500 filter is generally easier to find and generally a lot cheaper to buy, genuine that is not aftermarket. So it will pay for itself in the end.
You could just fit the 550 filter with the bottom tubed part of the recycling system fitted as well. What you shouldn’t do is fit it without that part fitted as well, firstly because it has a small seal that seals around the hole in the bottom of the filter and secondly because without that seal unfiltered air is getting into the engine and you might as well not fit an air filter if that’s happening.
Drop a little oil down the plug holes, just a few drops, and leave it for a while. Test compression again, don’t forget, throttle wide open, kill switch to off. It could be ring wear, it could be the rings are stuck in their grooves so aren’t sealing like they should, the oil may help them become unstuck. If the readings go up significantly then that points to the rings being the problem.
I seem to recall that the 550 brake plate won’t fit in the 500 hub, it fits physically but a flange on the plate rubs on the hub. Been a while so I might be mistaken.
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