How much free-play in secondary?

Q. Arrius

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Snowmobile
'17 Sidewinder LTX LE (red)
'12 Apex SE (black)
'12 Arctic Cat F800 snopro (129, orange)
'15 SRX 120 (blue)
''15 S.Doo Renegade XRS (Ronald McDonald colors)
Sled: Apex SE, '12 w/ 1750 miles total. Studded track, first owner, bought at zero miles.

Background:
As I mentioned in a previous post, I'm trying to locate the source of a thumping/popping sound. I raised the track off the ground and and ran at various speeds. I absolutely have a thump....I can watch the hose guard flex in and out slightly....depending on the track, whether its decelerating or not. I'm trying to duplicate when exactly the thump happens, and what I can do to replicate it.

I am doing this BEFORE I switch the belt. My studs bases appear fine ect.

Question:
I noticed the secondary seems to have a lot more free play or travel on the shaft, than I can remember. The gap measures 1/8th inch, NOT factoring in the washers. See picture.

I am just learning to deal with the clutches, and I'm a far ways away from modifying clutches, like some of you guys! That said, I'm determined to learn and not depend on shop service.

At what point do I add washers, like I've read before, and I know Arctic Cat owners do?

(I have a '12 F800 snopro to deconstruct and play clutch games on...but I'm definitely not wanting to screw up my Apex!.....so thanks for any help, pointers, and links to aid my education!)

Q. Arrius


IMG_2613.JPG
 
That's normal. Check the tension on the chain. Also sometimes a stud will not be seated correctly and maybe hitting the drive cog. Find it and snug it up.
 
start with the simple change the belt and check the bearing behind the speed sensor.
 
What Thor said ! Leave the secondary , it's fine. Belt, then speedo side drive shaft bearing. I had a jack shaft bearing, behind the secondary, let go last year. Thought I grenaded the chain case it was so loud of a bang.
 


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