590 EXT Clutch Setup Bogs - Snowmobile Forum: Your #1 Snowmobile Forum

bradbeer · 12-10-2012, 12:24 PM

I hope someone can help me out with this problem I have…
I have a 1993 580 EXT Mountain Cat. It has always had an issue with bogging. I bought it with this problem. I have tried all different jettings. I do not think it is a jetting issue. I think it may be a clutching issue:
I have replaced the hifax and drive line bearings.
It has a brand new 2” lug track on it. This is my clutch setup:
Comet 108C
Red Spring
48 G weights
Secondary Yellow spring with a 49* Helix.
Is this the correct setup for this track? What would you recommend for changes? Clutch engagement is at 3500rpm does this sound correct?
Thank you,
Brad

**RJ Gleason** · 12-10-2012, 03:13 PM

Engagement is correct, now, what is it peaking at?

**kccats** · 12-10-2012, 05:15 PM

WHAT? Engagement should be 4500! The red may be to tight? Should be a Yel/Green!

**RJ Gleason** · 12-11-2012, 12:31 AM

Mountain cat engagement would be lower than on a trail sled to prevent trenching.
His peak rpm is what we need to know now.

**kccats** · 12-11-2012, 06:59 AM

Start with the center to centers, and the belt needs to be as tight as possible!

bradbeer · 12-11-2012, 08:10 AM

I have a yellow/green on order and the belt squeels a wee bit. It as also about a 16th of an inch proud of the secondary.

Anything elce?

Thanks,
Brad

bradbeer · 12-11-2012, 09:58 AM

Quote:

Originally Posted by RJ Gleason

Mountain cat engagement would be lower than on a trail sled to prevent trenching.
His peak rpm is what we need to know now.

Thanks RJ. I'll have to take it for a run and let you know!!!

Brad

bradbeer · 01-03-2013, 04:54 PM

Hi guys, I finally got her out today after a few little adjustments:
I replaced the bushings in the primrary weights, put in a yellow/green spring went to a BR8ES plug and dropped the mains to 190.
The sled ran much better. It kicks in at 4500 now. It does not seem to be to violent of a start. The plugs were a little light in color. I will be going back to the BR9ES’s.
RJ my peak RPM is 8500. That seems high. Is it?
I also put the secondary spring back to the middle hole. How does the hole change max RPM?
I have a Huge 2” lug track. I think this is where most of my issues come from. Would a different helix compensate for the heavy track? I have a 49* on it now. It still seems a like a bit of a dog out of the hole.

Thanks everyone for your help!!!
Brad

**RJ Gleason** · 01-04-2013, 06:04 AM

When you move the spring anchor hole, it changes the tension slightly which will effect the up and back shift along with peak rpm.

When you put that tall track on, did you change the sprockets in the chain case?
You might want to consider switching the top sprocket from the 20t to a 19t [gear down] to give your engine a better chance to turn all that rotating mass.

bradbeer · 01-04-2013, 07:04 PM

Yes, it had a 19 tooth gear on it. is 8500rpm too much? Where do you think it should be at?

Thank you,
Brad

**RJ Gleason** · 01-05-2013, 01:34 AM

That is still a little out of the correct range, move your anchor hole forward one more.
Each hole is appx 200 rpm change.

**kccats** · 01-05-2013, 04:45 AM

I would loosen it 1 hole and you should be good to go! At 3500 engagement there wasn't enogh hp yet to turn that track!