Chain tight spot

[Frost]

Does anyone have any expirence with removing a tight spot in a chain?
I just replaced the rear sprocket on my bike and it has caused one hell of a tight spot int he chain, it makes the bike near unrideable so any advice you might have would be greatly apreciated!

[Hex]

Tooth brush and some paraffin. give the tight link and those either side a good clean, and work till its loose.

Then wash/rinse with water and dry and re-lube the chain.

The paraffin wont damage the o rings like wd40 will etc and when washed it will more or less wash off leaving a nice clean free link for the lube!

remember lube is best put on after a ride, as the chain is warm and the gaps more open for the lube to get into. But do put some lube on after cleaning the chain.
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[robbiehall]

Why did you have to replace the sprocket? was it badly hooked (worn)? If so then you will find the chain has stretched, helping to cause the hooked teeth as it rides up over the sprocket teeth. They ought to be replaced as a set.
The tight spot may come out with a clean and lube, as it may be caused by dirt/rust/dry running, but personally I would take it as a sign to replace the chain.
Also can you pull the chain away fom the sprocket?, a good wear indicator too.
The next set I buy will be kept as clean as possible, and I will try Castrol Chain Wax and not oil or greasy chain spray. and I will check the chain for wear as often as I can.

IMHO
Rob
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The older I get, the faster I was.

[Frost]

Old sprocket was not worn, chain is new, sprocket was replaced due to me altering the gearing.

By tight spot i mean the chain has just the right amount of slack in it, yi turn the back wheel a bit, the chain stays just slack enough, then it gets really tight. I keep turning the back wheel and it slackens off again.

When riding this causes the bike to pulse forwards rather than accelorate smoothly.

[Hex]

[craigT19]

When i was in france i managed to go past the tightspot stage and kink my chain, due to my scott oiler having an airlock and me not noticing, all i did was...like gav said, used a wire brush with some silkolene chain spray , cleaned the link as well as i could and sprayed the thing with oil...i then also went about 30 miles with my oiler on purge, that sorted me out
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[Kickstart]

[Hex]

My understanding is the pin has the o ring round yes? As the o ring perishes it allows the pin to move more.

So no real stretch occurs as such more wear allowing more movement. Guess it depends on your meaning of "stretch.
____________________
The BCF's very own Party boy! Though he's getting old and feeling it!
Monkey hanger, Born and bred
My little photo portfolio

[Kickstart]

[robbiehall]

OK, I see, then that is normal, every chain I have ever had has a low and a high part of it's run. You should adjust where the tightest part gives the correct slack (whatever it recommends in the manual). Not sure what causes it, but have always been told to use that method.

Weird that, look at 'tightest' and it just looks WRONG, like when you look at the same word over and over again, they start to look like you are not spelling them correctly !!IMHO that is....

Yes I agree it seems funny that a chain might stretch (seeing as it is hard metal), but it is the overall wear in the links that, added up, makes the overall length, ermm, longer.

Cheers
Rob
____________________
The older I get, the faster I was.

[Frost]

I only asked, as my dad had a JH-90 years ago (basically a geared honda 90 commuter). the chain on that had one hell of a tight spot on it. He replaced both sprockets and the chain as a matching brand new set. yet still he had exactly the same tight spot that just would not go away no matter what he tried.

[Kickstart]

Hi

I would not be certain this is the problem, but you could get a similar tight spot if the rear sprocket was not mounted concentrically with the rear wheel spindle. However you would have a tight spot / loose spot with each turn of the back wheel rather than of the whole chain.

Suppose a similar problem with the front sprocket (maybe the output shaft from the gearbox being bent) could also do the same, and maybe combine with rear sprocket problem to make the situation worse.

All the best

Keith
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