Coolster 125

china007 · 03-20-2018, 12:19 AM

How tight should the chain be. There is zero slack and the nut adjustment would not help. Do the chains loosen over time. I feel like I could play a note like a guitar string.
Thanks

Douglass · 03-20-2018, 10:30 AM

There should be a little bit at least. Did the bike come with a manual? if so, there is usually some info about the chain slack. Can you take a few pictures of the rear axle?

china007 · 03-20-2018, 12:16 PM

It did not come with a manual I will upload some pictures later. I've ridden it and my kids have also I just don't want to cause some damage. This things sounds pretty good for a 125. It rips with my big butt also.

Douglass · 03-20-2018, 01:20 PM

Is it an ATV or a Dirt bike? Either way there should be some slack.

letsride · 03-20-2018, 03:47 PM

yes loosen the chain. Go to youtube and look up "motorcycle chain adjustment" The chain should stretch and loosen up, but it being that tight is NO GOOD for the engine at all.

Weldangrind · 03-21-2018, 11:10 AM

The tightest point of the chain will be when the rear axle, the swing arm pivot bolt and the center of the countershaft sprocket are all in a straight line. You may never compress the suspension that far, but it will still be the tightest point in suspension travel. If you support the bike/quad on a jackstand and then remove the rear shock, you can then raise or lower the rear axle with a scissor jack until all three points are in line.
At that point, the chain should be taut without being tight. Everywhere else in the range will be safe.
Once you have the chain adjusted, put the shock back on and put the wheels back on the ground. Measure the unloaded deflection of the chain and write it down for future reference.
It could be that the factory chain is simply too short. I encourage you to remedy that before riding it anymore.

china007 · 03-26-2018, 04:25 PM

Attached is the rear picture adjustment.

**JerryHawk250** · 03-26-2018, 04:52 PM

You may just want to upgrade the chain and get a longer one. You could try removing one of the nuts on the adjuster and see if it gives you some slack.

china007 · 03-27-2018, 01:01 AM

I think you are right now chain here I come.

Thanks

03-20-2018, 12:19 AM	#1
china007 Join Date: Feb 2018 Posts: 68	Coolster 125 How tight should the chain be. There is zero slack and the nut adjustment would not help. Do the chains loosen over time. I feel like I could play a note like a guitar string. Thanks
	0

03-20-2018, 03:47 PM	#5
letsride Join Date: Oct 2013 Location: Leesville SC Posts: 835	yes loosen the chain. Go to youtube and look up "motorcycle chain adjustment" The chain should stretch and loosen up, but it being that tight is NO GOOD for the engine at all. __________________ My Stable- 2022 Lifan KPX250 , 2023 Royal Enfield Himalayan, 1992 Honda GL1500 Goldwing, SSR 70 Auto, Kymco Mongoose 90, Honda Four Trax 300
	0

03-21-2018, 11:10 AM	#6
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	The tightest point of the chain will be when the rear axle, the swing arm pivot bolt and the center of the countershaft sprocket are all in a straight line. You may never compress the suspension that far, but it will still be the tightest point in suspension travel. If you support the bike/quad on a jackstand and then remove the rear shock, you can then raise or lower the rear axle with a scissor jack until all three points are in line. At that point, the chain should be taut without being tight. Everywhere else in the range will be safe. Once you have the chain adjusted, put the shock back on and put the wheels back on the ground. Measure the unloaded deflection of the chain and write it down for future reference. It could be that the factory chain is simply too short. I encourage you to remedy that before riding it anymore. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

03-26-2018, 04:52 PM	#8
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,574	You may just want to upgrade the chain and get a longer one. You could try removing one of the nuts on the adjuster and see if it gives you some slack. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel Last edited by JerryHawk250; 03-27-2018 at 07:39 AM.
	0

03-20-2018, 10:30 AM	#2
Douglass Join Date: Aug 2017 Location: Bay Area, CA Posts: 375	There should be a little bit at least. Did the bike come with a manual? if so, there is usually some info about the chain slack. Can you take a few pictures of the rear axle?
	0

03-20-2018, 12:16 PM	#3
china007 Join Date: Feb 2018 Posts: 68	It did not come with a manual I will upload some pictures later. I've ridden it and my kids have also I just don't want to cause some damage. This things sounds pretty good for a 125. It rips with my big butt also.
	0

03-20-2018, 01:20 PM	#4
Douglass Join Date: Aug 2017 Location: Bay Area, CA Posts: 375	Is it an ATV or a Dirt bike? Either way there should be some slack.
	1

03-27-2018, 01:01 AM	#9
china007 Join Date: Feb 2018 Posts: 68	I think you are right now chain here I come. Thanks
	0