Motorbike rear wheel dragging

sithmaster

Hi all my nc750x is having a problem with the rear wheel, I recently had an mot it passed but got an advisory with the chain was slightly slack.

I have sorted that like I have done 100 times without any problems but this time, most of the chain is fine but when it gets to a point the chain goes very tense and is putting a lot of friction on the rear wheel, I have ridden it without any problem.

I'm now trying to fix this but it keeps happening, I have inspected the chain and sprockets and they look fine, when the tension happens I can feel I very slight bump when moving the wheel, I was thinking wheel bearings but these were replaced with last tyre change about 700 miles ago.

Any suggestions?
Thanks

wgl2014

Possibly a stiff link in the chain? Turn the wheel by hand and see if the resistance is at any particular point.

John_Jones

Likely one of two things. As above, a stiff link pulling the chain too tight, or you have the wheel out of line and the rear disc is dragging.

In addition to checking the chain go for a few minutes ride without touching the back brake and see if the rear disc is getting hot.

Chain and sprockets are items that need periodically replacing. If you do need to replace one or the other though replace all at once, as a worn sorocket will wear the chain and vice-versa.

sithmaster

I have just redone the chain slack again after setting to a new chain, and seems to have sorted it for now, sprockets are in poor condition when I got a torch out as 1 tooth is slightly bent so I think I will change the chain and sprockets, it's a pity as it's still on green but has done 12k miles

Thanks for the help

Norman_Castle

Mark a link on the chain and turn the wheel. If the tightness is always in the same place its almost certainly the chain. Try loosening the chain and bending it in the opposite way to when wrapped around a sprocket.
The chain likely needs proper lubrication or replacement.


Edit. If the sprocket is damaged its possible a stone got caught between it and the chain also damaging the chain.

John_Jones

sithmaster wrote: »

I have just redone the chain slack again after setting to a new chain, and seems to have sorted it for now, sprockets are in poor condition when I got a torch out as 1 tooth is slightly bent so I think I will change the chain and sprockets, it's a pity as it's still on green but has done 12k miles

Thanks for the help

I used to go through chains and sprockets very quickly on one of my bikes. At one point I could never afford to buy both at the same time so wrecked a set of each every couple of weeks.

Even when I stopped doing this I would still sometimes only get a few months out of a set through the winter, when they were getting caked in salt and dirt.

Nowadays I ride a shaft or belt-drive bike, but I did find a scottoiller helped a lot when I was still using chains. It was a riddle to get it set up right at first, but kept it like new for a long time afterwards.

Richard53

I always change the gearbox sprocket at the same time as the chain, and the rear sprocket every *other* chain replacement. Sprockets and chains wear together, and often renewing one without the other leads to early failure.

missile

You guys need to look after your chains better.