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+--- Thread: clunking gearbox (/showthread.php?tid=64720)
clunking gearbox - dooz - 26-07-13
Hi guys
I have owned my 2001 Fazer 600 for 4-years and it has 15,000 miles on the clock, of which I have done 11,000. A week ago in Germany, I started to get a clunking at walking pace. I could hear the clunking and feel it through the footrests and handlebars. The frequency of clunking increases with engine speed and as I change up the box. At motorway speeds the frequency becomes a high pitched vibration which sends my hands numb. It is getting worse.
I have checked the chain tension / lubrication and both are ok (scot-oiler fitted). The chain looks as though it has one or two tightish links but is ok. The rear sprocket is ok. The gearbox sprocket is slightly hooked but I have seen worse. The gearbox sprocket nut was tight, very tight, I guess it is as it left the factorty.
I took out the rear wheel and took off the gearbox sprocket and pulled the chain out of the way. When I fired the bike up the clunking is there exactly the same. It seems to be from the output shaft bearing area although it could be the output shaft itself.
Has anyone else experienced anything similar?
Dooz
Re: clunking gearbox - andybesy - 27-07-13
Hi Dooz,
I'm not an expert but in the absence of any other replies I'll chip in.
First thing that sprang to mind reading your post was tight spots in the chain - they can develop suddenly and when I've had them they've sounded and felt exactly as you describe.
But it sounds like you've taken reasonable steps to rule that out, so if you're sure it's not the chain then I'd maybe consider a quick oil change.
Couple of reasons. Firstly it can't hurt, and you never know it might help, even if you go for cheap oil. Just something to try given the location of the problem.
Secondly you can take the opportunity to carefully inspect the old oil for any swarf or other debris, and also check it's colour etc. Might provide some useful diagnostic info.
Maybe the old oil has failed in some way, or become emulsified, and is not properly lubricating?
Just an idea for something to try.
Andy
Re: clunking gearbox - andybesy - 27-07-13
Hi dooz,
Another quick idea: Check your engine mounting bolts are all secure.
Andy