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Mike's CB550 Project

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Oddjob:
Would depend Mike if they replaced the standard plain nut with shouldered nuts.

McCabe-Thiele (Ted):
I guess if you are not sure you have the correct original UBS (Uniform Bearing Stress) nuts?  That's a new term for me. Presumably some sort of  high tensile specification nut, to match the bolts then a lock washer might be a good idea.

Mike_Berkshire:
They look like the nuts in the picture

Mike_Berkshire:
I spoke to the guy that is rebuilding my wheels yesterday and they are not going to be done until mid to end of next week so I am still paused. I dont want to run the bike without the wheels on it as I dont have a stable lift; just blocks, centre stand and some old bits of carpet and to further investigate the charging circuit/alternator I need the bike running. So I have been staring at it in the shed thinking of what else I need to do. Apart from the hanging throttle problem the engine seemed to be running fairly sweetly last time I started it. However, I noticed there is a heavy carbon deposit on the plugs and inside the exhaust silencer. Although I ran the bike off the choke after it fired up it hasnt run under load yet. Should I expect to see soot like this if I have just run the bike stationary a few times? From when I first rebuilt the carbs last year I remember the needles are mounted a bit higher than normal and I havent changed the position - I cant remember what notch in the needle the clip is in and I cant find the post I did about this :-(

When I got the bike it had no air filter in it although all the airbox gubbins was in place so this would mean the airflow into the carbs was unrestricted which I assume would mean less vacuum = weaker mixture which may mean the PO raised the needle height in an effort to compensate?? I am running the bike with a new airfilter and new rubber unions from carbs to inlet manifold and carbs to airbox.

If I remember correctly it is possible to change needle height without removing the carbs; is this right and should I reset the needle heights whilst I am waiting for the wheels and the tank is off?

Cheers, Mike

taysidedragon:
If everything else on the engine is standard I would fit the needle clip in the standard position. I think you're right in thinking that the PO raised the needles to richen the mixture. Put them back where they should be. 👍

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