clutching?

yep · Jan 22, 2010

Got a clutching question. I have a 05 700 144X16X2. Track is off of a skidoo rev. Geared to 18-39, stock is 19-39. I ride from 1000-3000 feet almost all the time. Just wondering what would be a good setup for me. I ride deep snow with quite a bit of climbing and tree riding thrown in. And i dont know if it matters but i weigh around 265 lbs. Thanks, any info is good info.

volcano buster · Jan 22, 2010

I've got an '05 700 144x15 and run 3k-6k usually.

I ran the 18-39 gearing until this year when I went to the 19-42. Only rode it once so far, so not sure what the gearing will buy me. I ended up putting 10-62 weights to keep the motor at 8000 rpm's max, with a Team almond round spring. Secondary is stock. Seems to work pretty well, but I like to gas and go.

yep · Jan 25, 2010

Ride it and let me know how it works. I suppose the weights and spring would be different at my elevation. But i do on occasion ride at that elev.

SD Coyote · Jan 25, 2010

yep said:
Got a clutching question. I have a 05 700 144X16X2. Track is off of a skidoo rev. Geared to 18-39, stock is 19-39. I ride from 1000-3000 feet almost all the time. Just wondering what would be a good setup for me. I ride deep snow with quite a bit of climbing and tree riding thrown in. And i dont know if it matters but i weigh around 265 lbs. Thanks, any info is good info.

Don't want to offend, but yes weight does matter. You did the right thing to gear down when pulling more track. At 18/39 you are at 2.17. Due to your riding style (climbing and trees) and being a big man, you should consider going to a 19/43 (2.26). You will need a 74 pitch chain, even at 19/42 (2.21). With the lower gearing, your clutches will be much cooler and belts will live longer. Once geared, you just have to adjust clutch weights to pull around 8000rpm.

yep · Jan 25, 2010

Thanks for the info. The sled seems to run around 7400 rpm. I seems to pull pretty hard. Is that a that a good range for power?

devilrmk · Jan 25, 2010

You need to be within a couple hundred rpm of 8100 peak or you are not making any power. It drops significantly above or below that.

yep · Jan 25, 2010

right on. thanks for the info. what would u change to get ur rpms up?

wellfed777 · Jan 25, 2010

that depends on a few questions first
does it ever rev to 8000 on the trail or flat ?
in a climb does it start off reving 8000 and then slowly bog down to 7500
also are your clutches in good repair (when was the last time they were checked out)
give us a little more info and i think you will find a big wealth of info on the subject from some guys on here that know there stuff

devilrmk · Jan 26, 2010

^^^^^ What he said but a simple answer is clutch weights. Theres more to it than that though unless it clutches just right except for top rpms.

SD Coyote · Jan 26, 2010

devilrmk said:
You need to be within a couple hundred rpm of 8100 peak or you are not making any power. It drops significantly above or below that.

Good info! Answers above good too! You need to figure out why the rpms aren't there. Are your valves clean and opening fully? Are your clutch springs fresh? Do you feel your gearing is sufficient for your size and riding conditions. That 1" wider track x 12' makes a diff that I'm sure you are aware of. Assuming your clutches are in good working order, you could do like mentioned and go with lighter weights and or a pri spring with more rate. If you are reaching more rpms but falling back to 7400, you may need to change sec helix or spring.

volcano buster · Jan 26, 2010

I was able to borrow a set of weights from a guy when I was doing mine so I could try things before I started dropping $75/set to find out they didn't work. Also, check out SLP's website. On their page for a pipe on your motor, there is a dyno tab, check it out for the stock setting and you will see how much power is lost if you are not running at your peak rpm.

http://www.slp.cc/catalog.cfm?pageID=detail&view=dyno&catalogID=3&catID=19&productID=182

yep · Jan 26, 2010

I just cleaned the exhaust valves about 2 rides ago. It seems to hit 8000 on trails and initial start then falls off. I could probably use new springs. Its got about 800 miles on it (pretty low).

yep · Jan 26, 2010

Wow. I see what your saying about how fast the horsepower drops off really fast before and after 8000 rpm. How does the spring rate in the secondary effect things? Does it just change shift points?

theultrarider · Jan 26, 2010

I too am a big guy. (250). I have found for myself, and the light guys for that matter the team black/purple works great in these sleds. It holds the r's much better than the black/red they call for. You will most likely want to drop to a shallower finish angle in your helix. Not sure what you have in there now, so this is just an example. If you have say a 60.42.46 you should go to a 60.40.46... doing this, helped me out alot. That, and gearing down to 19/43 like was mentioned above. It is a whole different sled now.

yep · Jan 26, 2010

Sounds good. Do u think leave the same weights in it? Mine r 10-64. Im not sure about the secondary. I'm looking tryin to find that. Whatever is in it is stock. I haven't changed anything to do with clutching. Mostly because I'm not very clutch competent.

theultrarider · Jan 26, 2010

I'm thinking you should be able to pull the 64's. Might have to drop to 62's but I doubt it. We also ride mostly 0-3000' You say you are hitting 8000rpm now on hard pack so that tells me you weights are correct, but your secondary set up is not backshifting for you. That is very critical in the deep soft stuff and even more so with us big guys. When mine was giving me fits, my boy (140lbs) would hop on it and it would rip. Very frustrating. It now works very well for me too.

yep · Jan 26, 2010

Found my helix angle... 54/42-.36. So are you sayin go to a steeper angle? What do you run ultra rider? If you dont mind me asking. In the past you've said where you live and we have that in common, just thinkin that might be alot of help. If its not too much to ask. Sorry guys. clutch illiterate.

theultrarider · Jan 26, 2010

Not a problem. I ride an 03 800 vertical escape. wife 03 800rmk and the boy a prox 700 long tracked. They all started stock, then singles, and currently all three sleds have twins so I have been around several different setups with these sleds. I have also setup numerous edge rmks for freinds with diffferent pipe combos. I live in Alaska. I think the 42 degree angle is what is holding you back. I couldn't pull that well with my 800 with a single. I would drop to a 54.40.36 maybe even a 38. That and the stiffer back/purple spring should bring your r's back up in the deep or on a hill. Let me ask you this. If you take a poke at a hill do you have your 8000 when you first hit the bottom, then the r's just slowly keep falling off and off?

yep · Jan 26, 2010

Awesome info. They seem to be pretty close to 8000 then fall off. But they don't just keep falling. They usually stabilize around 7400-7500.

theultrarider · Jan 26, 2010

Yep. That's what I figured. A helix and spring should take care of that. Dropping to 19/43 will help you as well. Makes the belts live longer as well. Sounds like you like the slower technical riding like I do and you won't miss what you lose on the top. Mine and the wifes are 19/43 and the boys is 19/41 I think. But then again, he is only 140lbs and is only running a 136 track. Kid spends more time in the air than on the snow anyway lol.

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