.004" run out clutch end of jackshaft

[Soupy]

Honestly .004” on the jackshaft is amplified out at the end of the sheaves. Probably 4 times that on the end of the sheave. Way to much runout.

My thoughts exactly

 

[Soupy]

Soupy, this is Eric DW, Bakker's buddy from way back. I'll let you run my secondary if you let me try some of your aftermarket clutch parts. have had zero belt issues. Be back from the up late tomorrow night.

That would be great! I'm heading up thursday.

 

[Soupy]

Still don’t like the run out that’s horrible imo. You said you indexed the clutch and cut that runout in half? Wow I’m wondering if that sled was miss handled in production and something hit the secondary slightly bending the jackshaft and clutch? Or maybe during transport and body panels fixed? I know of a guy who messed up his primary bumping into a tree and it did the same thing, blew one belt after another until he had a new clutch and straightened the crank.

Indexed and aftermarket helix. With the stock helix I was getting .025 run out on the moveable sheave. Does the runout decrease after the belt starts shifting? I'd have to assume so.

 

[Soupy]

Bringing this back up because this sucks! I've tried another stock clutch and 2 different secondaries, still hot clutches. Removed fuel tank and measuring .005 runout at center of jack shaft. Bearings have .001-.002 slop but are tight. What I believe is more concerning is the .005 run out I'm getting at the end of the jack shaft, over the splines where the secondary mounts. The heat has got to be coming from that, the engine, or a lack of ventilation. Does anyone have a spec for total allowed runout at the end of the jack shaft? I've been told that skidoo's spec is less than .003 maximum allowed. I have vents ordered but will probably test by just removing the entire side cover and riding on the ice with little to no snow. Belt temps are 180° and up, just slow trail riding.

 

[Sevey]

It cant be because of heat in the engine compartment. Some guys here posted that the cowls are sloppy letting air in. That would only assist airflow.

If that's the case those mo flow vents where your knees are, would be a good addition letting all the hot air on the inside vent out. Constant air exchange inside the cowl is never a bad thing.
MS

 

[jaydaniels]

I haven’t had issues with blowing belts yet but riding with an ‘11 apex, ‘15 800 Etec, ‘14 mpi Turbo viper and a ‘15 800 Pro R, my sidewinder definitely had the hottest running clutches. The viper was nice and cool to the touch. If I have a chance tonight I’ll check the runout on my jackshaft.

 

[Soupy]

It cant be because of heat in the engine compartment. Some guys here posted that the cowls are sloppy letting air in. That would only assist airflow.

If that's the case those mo flow vents where your knees are, would be a good addition letting all the hot air on the inside vent out. Constant air exchange inside the cowl is never a bad thing.
MS

Mine is siliconed up tight because I thought snow & water getting in may have been the problem. Easy to test by removing the side cover I guess.

 

[Soupy]

I haven’t had issues with blowing belts yet but riding with an ‘11 apex, ‘15 800 Etec, ‘14 mpi Turbo viper and a ‘15 800 Pro R, my sidewinder definitely had the hottest running clutches. The viper was nice and cool to the touch. If I have a chance tonight I’ll check the runout on my jackshaft.

I'd appreciate it, thank you sir.

 

[Soupy]

I haven’t had issues with blowing belts yet but riding with an ‘11 apex, ‘15 800 Etec, ‘14 mpi Turbo viper and a ‘15 800 Pro R, my sidewinder definitely had the hottest running clutches. The viper was nice and cool to the touch. If I have a chance tonight I’ll check the runout on my jackshaft.

By chance were you able to check runout? Or could anyone else check theirs? Or does anyone know what the max runout should be? I heard skidoo max spec was less than .003 so I'm double that. My dealer is checking on it too but don't wanna wait any longer than I have to.