pregen chain problem?

fr1dayn1ght · August 25th, 2013, 06:27 PM

Hi,
today after I cleaned and readjust my chain slack, I noticed the chain is tight at some spot and loose at some when I was spinning the rear wheel, is this normal??
also, attached a video of my chain running. It doesn't seem smooth and wobbling up and down instead, again Im not sure if this is normal or not, just checking in case it is then I will try to fix before doing any damage to the bike

http://www.youtube.com/watch?v=lzcxPeQXl9Y
Thanks!

kirk595x · August 25th, 2013, 07:03 PM

It's stretched...Replace asap.

jkv45 · August 25th, 2013, 07:04 PM

Did you adjust the tension at the tightest spot? You need to spin the wheel and find the tightest spot - that's where you need to set it.

A large difference means either a link in the chain is seized or damaged or there is uneven wear on the sprockets. There will almost always be some difference, even with a new chain and sprockets, but if it's excessive you need to replace the chain and both sprockets. Just replacing a chain, if you have worn sprockets, will not usually cure the problem - and will wear your new chain very quickly.

Here's a video from Canyonchasers that covers chain adjustment - http://www.canyonchasers.com/video/chain.php

fr1dayn1ght · August 25th, 2013, 07:16 PM

Quote:

Originally Posted by jkv45

Did you adjust the tension at the tightest spot? You need to spin the wheel and find the tightest spot - that's where you need to set it.

wow ninja250faq didnt mention this!! i was so confused

! big thanks man!
from the vid, can i still save the chain by readjusting though?? idk how many miles are on this chain

jkv45 · August 25th, 2013, 07:47 PM

Quote:

Originally Posted by fr1dayn1ght

wow ninja250faq didnt mention this!! i was so confused

! big thanks man!
from the vid, can i still save the chain by readjusting though?? idk how many miles are on this chain

A basic check of chain/sprocket wear test is to pull on the chain at the farthest rear point of the sprocket. If you see more than 1/2 of the sprocket tooth there is too much wear. If there's any amount of hooking on the sprocket teeth the sprocket is junk.

Re-adjust the chain and see how much additional slack you get at the loosest point. Off the top of my head, I would say if it's more than 50% additional you'll need to plan on replacing at least the chain - assuming the sprockets look good.

Best is to always replace the chain and sprockets together.

mgorven · August 25th, 2013, 10:07 PM

http://faq.ninja250.org/wiki/When_do...replacement%3F

The service manual will have a section on Drive Chain Wear Inspection showing how to determine if the chain has stretched too much.

August 25th, 2013, 06:27 PM	#1
fr1dayn1ght ninjette.org member Name: Binh Location: NJ Join Date: May 2013 Motorcycle(s): '07 Ninja 250 (sold), 2013 CB500F Posts: 125	pregen chain problem? Hi, today after I cleaned and readjust my chain slack, I noticed the chain is tight at some spot and loose at some when I was spinning the rear wheel, is this normal?? also, attached a video of my chain running. It doesn't seem smooth and wobbling up and down instead, again Im not sure if this is normal or not, just checking in case it is then I will try to fix before doing any damage to the bike http://www.youtube.com/watch?v=lzcxPeQXl9Y Thanks!

August 25th, 2013, 07:03 PM	#2
kirk595x ninjette.org guru Name: Robbie Location: Sacramento Join Date: Jan 2013 Motorcycle(s): 03' Ninja 250ex Posts: 333	It's stretched...Replace asap. __________________________________________________ Perform Random Acts of Coolness!!ATGATT

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August 25th, 2013, 07:04 PM	#3
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	Did you adjust the tension at the tightest spot? You need to spin the wheel and find the tightest spot - that's where you need to set it. A large difference means either a link in the chain is seized or damaged or there is uneven wear on the sprockets. There will almost always be some difference, even with a new chain and sprockets, but if it's excessive you need to replace the chain and both sprockets. Just replacing a chain, if you have worn sprockets, will not usually cure the problem - and will wear your new chain very quickly. Here's a video from Canyonchasers that covers chain adjustment - http://www.canyonchasers.com/video/chain.php

August 25th, 2013, 10:07 PM	#6
mgorven ninjette.org member Name: Michael Location: Sunnyvale, CA Join Date: Mar 2013 Motorcycle(s): 2011 Ninja 250 Black Posts: 30	http://faq.ninja250.org/wiki/When_do...replacement%3F The service manual will have a section on Drive Chain Wear Inspection showing how to determine if the chain has stretched too much.