Doms CB550F1 project

[Bryanj]

Sprocket carrier is not fitted correctly

[DomP]

Before I commit to getting this hub relined, what's going on here with the alignment?

Show me a picture of you hub because i may have one already done 

Hmm, I've had to resize my photos which I've not needed to do before.  Here you go Trigger.

Sorry Dom, hard to tell from those pictures. I thought you had the wheel stripped down and that is the picture i was after to ID the hub 

Here you go Trigger, this is what the internals of mine looks like.

[Trigger]

Before I commit to getting this hub relined, what's going on here with the alignment?

Show me a picture of you hub because i may have one already done 

Hmm, I've had to resize my photos which I've not needed to do before.  Here you go Trigger.

Sorry Dom, hard to tell from those pictures. I thought you had the wheel stripped down and that is the picture i was after to ID the hub 

Here you go Trigger, this is what the internals of mine looks like.

Is that the hub from your bike ? Can not see any cracks in the liner .

[Nurse Julie]

When using a 500 air filter in a 550 airbox how do I prevent it dropping it the bottom?

A 500 air filter will not fit a 550 air filter box, it'll just drop to the bottom and won't line up where it needs to, I've tried it personally as I have 500 and 550.

[Trigger]

I need this angle picture to ID what sort of hub you have. Like this. I have put a picture on this forum before with the two different types of hubs but, can not find it 




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[DomP]

OK, I'll go out and get a photo now.   Regarding the 500 air filter, I though of making a bracket to bolt though the lower airbox hole to prevent the filter slipping down.

[Nurse Julie]

OK, I'll go out and get a photo now.   Regarding the 500 air filter, I though of making a bracket to bolt though the lower airbox hole to prevent the filter slipping down.

You could just use a 550 air filter Dom. There are 2 different 550 air filter boxes, one has a rubber cushion around it the other doesn't, as well as other differences in the air filter box set up between the 2 550's.

[DomP]

OK, I'll go out and get a photo now.   Regarding the 500 air filter, I though of making a bracket to bolt though the lower airbox hole to prevent the filter slipping down.

You could just use a 550 air filter Dom. There are 2 different 550 air filter boxes, one has a rubber cushion around it the other doesn't, as well as other differences in the air filter box set up.

I used a 500 filter because I'm missing quite a few of the original airbox bits and Ken told me it's the easier option.  Mine is the rubber cushion type.

[DomP]

Trigger-

[Nurse Julie]

OK, I'll go out and get a photo now.   Regarding the 500 air filter, I though of making a bracket to bolt though the lower airbox hole to prevent the filter slipping down.

You could just use a 550 air filter Dom. There are 2 different 550 air filter boxes, one has a rubber cushion around it the other doesn't, as well as other differences in the air filter box set up.

I used a 500 filter because I'm missing quite a few of the original airbox bits and Ken told me it's the easier option.  Mine is the rubber cushion type.

Ah yes, I remember seeing your photos now. If I remember, you had the piece with the stand on it but not the panching plate, which you can do without anyway.

[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]

Trigger-

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.