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My 550

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Ooops:
Here it is all nice and shiny:)
The picture was taken last year.

Unfortunately there is a knocking/clanking noise coming from the back of the engine. From what I can make out it appears to be coming from the gearbox area. I've tried pulling in the clutch to see if it goes away no luck. It does seem to lessen under increased revs.

I have carried some work so far thinking I was solving the problem. So far I've replaced the cam chain, plugs, air filter, oil filter and housing (old one had to be encouraged to leave the bike) Adjusted the tappets. All this part of the engine seems to be good now. Still I have the knocking/clanking noise

I do know the timing is out (would like a boyer bransden electronic ignition when funds allow) and I think I will strip the carbs and service them.
It runs and pulls quite well, although I can find a few false neutrals when changing up from 2-3-4.
Not entirely sure what to do next. I was thinking of buying another engine to put in it until I can afford to sort the other one.
I have only really started working on my own bikes for the last year or so and to be honest I have very little mechanical experience. But that said I have tools and workshop manuals so more than happy to take things apart and see what happens.

Any suggestions greatly appreciated

Tim

basketcase:
Probably a silly reply BUT....have you checked that the sprocket is tight??

Ooops:

--- Quote from: basketcase on September 11, 2011, 10:07:18 AM ---Probably a silly reply BUT....have you checked that the sprocket is tight??

--- End quote ---

I'll check but the noise is there right from when I start the bike up and ticking over.

hairygit:
Might be a good idea to check carb balance, my good lady's cb650 shitehawk (Oops, Nighthawk) did the same, so we bought it for peanuts, if the noise stops when you put it in gear, that's probably a large part of it. (Cheap and easy fix!)

K2-K6:
You do need to check the simple and cheap things first as already suggested by the other posts.

But if you get nowhere then I'd suspect more the gearbox but it's hard to tell without hearing the noise in person.

Specifically if the gear spacing (assembly washers etc) is incorrect, or shift fork bent then you can get two gears trying to partly engage at the same time and making the noise, also the difficulty in changing gear points in this direction.

If you can run it on the mainstand in each of the gears then is the noise absent or any worse for a particular ratio? is it a cositant noise or more random?

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