Weird problem. Chain tightens up then goes loose.

[frankconley]

Hi. My jonsereds 621 chain gets right even when saw is not running. If I slide chain along bar it will go tight and then loose again with no pattern. In picture notice tips of things rounded off. Could bad sprocket cause this?

 

[Woodanhor]

Yes probably a sprocket issue
Got a picture of it

 

[RED-85-Z51]

Worn sprocket or something is warped

Sent from my LM-G820 using Tapatalk

 

[MacAttack]

Yeah either your chain or sprocket are f'ed.

 

[windthrown]

Likely the chain is worn out of round. It happens. Could be the nose sprocket, but also check the drive rim or spur sprocket.

 

[U&A]

Everyone else said drive sprocket so im going to go with, you need to check the flux capacitor and or muffler bearing. Might as well check the canooter valve while your at it.


Sent while firmly grasping my redline lubed RAM [emoji231]

 

[windthrown]

Everyone else said drive sprocket so im going to go with, you need to check the flux capacitor and or muffler bearing. Might as well check the canooter valve while your at it.

No no no no no, its the turbo encabulator! The failure is surely due to non-reversible amulite from the drawn reciprocation dingle-arm failing to reduce soinosoidal replaneration.

 

[cranman1951]

wrong size chain.....I thought I needed .325 , but really the sprocket was 3/8...acted the same way

 

[67L36Driver]

I’m soo cheap I’ll use two short chains to make a longer one. I. E. , add twelve dl from one to add to a sixty to make a 72 driver.

Have the tight/loose problem all the time as both used loops have different amount of wear on the pins/rivets.

 

[Huskybill]

No no no no no, its the turbo encabulator! The failure is surely due to non-reversible amulite from the drawn reciprocation dingle-arm failing to reduce soinosoidal replaneration.

But,,,,,but we must over come the negative reaction of the overflow dynaflow.

 

[Huskybill]

Get a new rim and drum, a new bar and chain and forget about it,!

 

[Sprinter]

How does it run? Could be bearing without a cage!

 

[PV Hiker]

How does it run? Could be bearing without a cage!

Glad you mentioned the bearing! One user complained about the chain not tight and loose, it was missing the "E" clip, cage was miss shaped.

 

[Huskybill]

Either the sprocket nose is missing rollers or the clutch bearing is missing rollers. All the rollers on one side will make the chain go tight n loose.

 

[WhisperingCreek]

A few of the bottoms of the drive links may have burrs on them. Happens to me sometimes when the chain pops off the bar.

 

[Joel D'Angelo]

I've had a few old chains act funny like that. Get tight then loose etc for no apparent reason. May just need a chain

 

[svk]

If a chain has a bent drive link it will do that too. Stiff until the link is off the bar rails then moves freely.