[HudsonHornet]

I’m wondering if putting a track extension on my 2001 Polaris Indy 600 classic to a 144. I do mainly trail riding and hard ditch banging, and off trail but mainly on trail. I’m just wondering what I would have to do about gearing and clutching. Please let me know thanks.

 

[BC_Dan]

Look at the Polaris spec for the RMK in that year and that would be a good place to start for clutching and sprockets in the chaincase. Track rail extensions are not as robust as a true 144" suspension, so if you are hard ditch banging, the extensions may not hold up well over time. You will also need to think about a tunnel extension, as the snow flap will need to be placed at the rear to help keep the cooling system cool (as well as not hitting anyone riding behind you with chunks!)

Doing a whole 144" suspension will require re-drilling the mounting holes for the suspension, so if you go that route, make sure to get exact measurements from the donor sled. Even a little off may compromise ride quality.

Welcome to the forum!

 

[kccats]

Welcome
As a fellow ditch banger, I can tell you it won't handle worth a dang!
All it will do is Push! It won't turn!
May I suggest a 121 x 1.25 Ripsaw or if you must then a 136"
There is NO reason to go longer than a 136" unless you are climbing Mountains!

 

[HudsonHornet]

Look at the Polaris spec for the RMK in that year and that would be a good place to start for clutching and sprockets in the chaincase. Track rail extensions are not as robust as a true 144" suspension, so if you are hard ditch banging, the extensions may not hold up well over time. You will also need to think about a tunnel extension, as the snow flap will need to be placed at the rear to help keep the cooling system cool (as well as not hitting anyone riding behind you with chunks!) Doing a whole 144" suspension will require re-drilling the mounting holes for the suspension, so if you go that route, make sure to get exact measurements from the donor sled. Even a little off may compromise ride quality. Welcome to the forum!

Look at the Polaris spec for the RMK in that year and that would be a good place to start for clutching and sprockets in the chaincase. Track rail extensions are not as robust as a true 144" suspension, so if you are hard ditch banging, the extensions may not hold up well over time. You will also need to think about a tunnel extension, as the snow flap will need to be placed at the rear to help keep the cooling system cool (as well as not hitting anyone riding behind you with chunks!) Doing a whole 144" suspension will require re-drilling the mounting holes for the suspension, so if you go that route, make sure to get exact measurements from the donor sled. Even a little off may compromise ride quality. Welcome to the forum!

Thanks for the reply. would having the same clutch and sprockets in the sled burn belts or be hard on the sled? The RMK for that year had 20-39 sprocket and the stock on the sled is 22-40. I want to keep up the speed at least 80mph on the lakes, would those affect it that much with the sprockets and track. I’m just wondering if I could run the same sprockets on it, or will that affect to much? or would it be better to run a 136 on the sled?

 

[kccats]

136"
Get as much HP out of the motor
Then clutch and gear it

 

[BC_Dan]

For your riding, a 136" would probably be better. I had a 136" RMK 700, regeared it to 20/40, changed the helix in the secondary, that thing was VERY quick to about 80 mph.

Going to the RMK specs will be easier on your belt, as it grips earlier and harder. A hard engagement keeps the belt from slipping. Trail gearing in the powder will definitely be an issue with belt life.

 

[HudsonHornet]

For your riding, a 136" would probably be better. I had a 136" RMK 700, regeared it to 20/40, changed the helix in the secondary, that thing was VERY quick to about 80 mph.

Going to the RMK specs will be easier on your belt, as it grips earlier and harder. A hard engagement keeps the belt from slipping. Trail gearing in the powder will definitely be an issue with belt life.

what would be good springs and weights for the clutching to get better engagement and easy on the belts?

 

[Coolhand]

Talk to the guys at EPI, Goodwin or SLP. They can set it all up with primary, secondary springs, weights and helix. Your best bet as they said is to go to a 136" and with a Ice Attack 1.063 or 1.25" as it has built in 240 studs and iirc comes in that size also. If you go to the link below they can give you the part numbers for the extension you will need. Any parts unlimited dealer or ebay or amazon should be able to get you the kit they sell.

2023 Parts Unlimited Snow

The 2023 Parts Unlimited Snowmobile catalog has all the parts and gear needed to help your customers get themselves and their machines ready for fun in the snow.

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