xcr 700 radar run setup - HCS Snowmobile Forums

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Old 02-18-2012, 09:40 PM   #1 (permalink)
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Angry xcr 700 radar run setup

Ran 95 in 1100 today Wtf these sleds are fast? I geared up to 25 39 main jets to 390 for some reason I.had an r8 helix when I bought the.sled. I'm running 192 studs now still has tons.of power will spin 20 feet then hook this thing should just fly pulls hard then falls on its face. I didn't clean my.exhaust valves and of course forgot my snap ring pliers at home today. I wasn't getting good rpm you could hear it start cranking up down towards the end. I need some ideA on where to start on my quest to put.this sled where it should be at the top. Should I scrap the progressive helix? What about other clutch setup.? I thought I knew this stuff guess I don't have a clue. It is a wicked trail sled should be faster at the radar runs.
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Old 02-18-2012, 10:31 PM   #2 (permalink)
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I just realized I'm supposed to have three washers under the helix snap ring. If I had a nickel for every time I passed that note over In the master repair manual thinkin it doesn't apply to me.
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Old 02-18-2012, 11:03 PM   #3 (permalink)
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3 washers? Seems way too many unless you are trying to tame the 50 degree start angle of the r-8 and move it down the ramp a bit farther. Polaris R series are good for speed runs. R11(45-36) or R12(50-36) are the ones I consistently use.

Instead of being down on the number you ran, compare that to the competition. Did you get blown out of the water in your class?

Also, trail setups more often than not do not work in radar runs...
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Old 02-19-2012, 02:11 AM   #4 (permalink)
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Yeah I think I answered my own question a bit there and yeah I got murdered I must've gLen my original helix out cuz I got a clutch from my buddy a while back and that helix was in better shape. I also learned tonight that even subtle helix change can be huge. They say in master manual all r series plus m and t helix have the slot cut deeper in back to allow for the wider storm and 600 700 twin belt. So if you have the narrower belt you have to add 2 extra shims. Pretty sure that helix change will be epic.

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Old 02-19-2012, 07:54 AM   #5 (permalink)
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Yeah, the 2 washer thing is only if you're using a helix that is cut deeper on the back for a wider belt, but you're using it with a narow belt, otherwise one THIN washer behind the snap ring.
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Old 02-19-2012, 09:23 AM   #6 (permalink)
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Originally Posted by 99xcr700 View Post
Yeah I think I answered my own question a bit there and yeah I got murdered I must've gLen my original helix out cuz I got a clutch from my buddy a while back and that helix was in better shape. I also learned tonight that even subtle helix change can be huge. They say in master manual all r series plus m and t helix have the slot cut deeper in back to allow for the wider storm and 600 700 twin belt. So if you have the narrower belt you have to add 2 extra shims. Pretty sure that helix change will be epic.

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You must use the wide belt if you expect it to work the way Polaris intended.

Then, do not use three shims under the helix snap ring as the wider belt will open the secondary farther and could bottom out the buttons on the helix ramps.
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Old 02-19-2012, 10:27 AM   #7 (permalink)
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Yes sir I can't wait to pick up my new helix today and with it my redemption..

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Old 02-19-2012, 10:35 AM   #8 (permalink)
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rpms were off, 192 trail studs, messed up secondary setup lots of spinning and still got 92 mph i would call that a good run.

do a search on radar runs or speed runs, i had some good articles for base setups in the thunder cat section.

for mph you have a lot of fine tuning on your chassis to do, dont have to spend much money at all, just getting the suspension dialed in and rolling nice.

for clutching some guys will tell you heavy weights and some say light weights. some say big helix's and stiff springs, big springs and soft springs or small helix's and small springs. start with what you have to work with.

mph takes time to get. you can put in the same setup that a guy has running 10 mph faster and you might not gain any speed.
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Old 02-19-2012, 10:39 AM   #9 (permalink)
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i wouldnt buy new helix's. i would check swap meets for the old polaris helixs. you get them cheap and they work great.

get a polaris black secondary spring, a silver blue is a nice starting point spring, but the black will pull more mph in the future. and polaris red spring,

you might end up going fast with 10-62 wieghts or with 47 gram weights. time will tell.

i always used the first hole in the helix's on the stockers,
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Old 02-19-2012, 10:58 AM   #10 (permalink)
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Current Sled(s): 99 xcr 700 97 XLT limited
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Location: The Iron Range Minnesota
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13-14 Mileage: 1000
12-13 Mileage: 500
11-12 Mileage: 100
10-11 Mileage: 300
Age: 38
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I'm gonna run to the local salvage and aftermarket dealer pretty sure goin to the r12 will be huge the reason I say thy is anytime I let off the throttle then pin it it'll straighten my arms out. The other thing is I weigh 290 pounds and I had the same speed as the two other buddies I had run it right after me and they are around 170 pounds. That tells me it wasn't shifting quick enough then I can go back to my stock gearing at 24 40. I'll keep you guys posted on this I have a gun so I can find out quick.

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