17-02-20, 01:39 PM
(17-02-20, 12:13 PM)fazersharp link Wrote: I recently changed my chain and sprockets, the sprockets and alignment were fine but the chain did hsve some tight spots and one in particular was tighter than the rest and it was that one that was causing the knocking sound which I could even feel through the left peg. Once I have changed everything it was silky smooth again.
Any tight spot on a new chain would indicate either the chain is a cheap Chinese rip off, big problem some years back ever stealers and importers were getting caught. But some cheap online types will still sell them as genuine, so beware. Or it's been fitted incorrectly, normally issue with the link and/or the sprockets, mostly the front hasn't been changed. Why the front, many owners don't take the cover off to check.
(17-02-20, 12:13 PM)fazersharp link Wrote: Could a dealer get it so wrong and then also not realise the issue on hearing it. If they have over tightened the link then its also likely that the sprockets are out of alignment too.
Yes they can and do very regularly, many so called bike mechanics aren't, many have had little or no formal training so called apprenticeships . Many are paid very poorly, so the positions don't attract quality people and it's all about workshop through put i.e. money above all else. Another neat trick is to loosen off a badly fitted chain by setting the chain slack at the top end of tolerance it will get rid of most of the noise if not all of it. But the chain will have reduced life, right from the off. (quality chain and sprockets correctly fitted and oiled/adjusted should last 20- 30k) This will depend on how over tight the link is/was the chain slack doesn't always work. Worse cases I've had bikes in where you can see the stealer has, used a link breaker on it enough to free it off. Doing this stops the noise, but will cut the chain life depending on how much they've loosened it to a matter a a few 1000k, they then claim you haven't oiled it.
New chain and sprockets, no tight spots at all, no noise or vibration, if you've got any it's not fitted correctly end of.
Later