i have a 2006 switchback 600ho and want to get a clutch kit and possible gearing this year. was wondering what everyone has tried and what is a good combo. looking for a good setup for the aggressive riding.
thanks

I would run the team 420719 helix, set timing to 28 degrees, gut the airbox and run 390-400 mains. I have been told by a reputable dealer that erlandson maroon with 10-64 in the primary.

thanks pockets

420719LW 66-44-42-E (.46/.25/.25) 70-46-42-E (.46/.25/.25)
420719 Helix, S, 66-44-42-E (.46/.25/.25) 70-46-42-E (.46/.25/.25)

pockets which one of these do i want?

The 420719 is for the clutch as your 06 has, the LW is for the lightweight team as the 07's have. 4 screws holding the helix on the 07, as opposed to 8 on yours.

Best clutch kit for a 600 switchback:

56-42-.36 cam, 11-64 weights (ground down to 60 grams, or if you have a hot 600 62 grams may be light enough) and an Almond-Red drive clutch spring. Almond-red is very close to EPI's maroon spring, but it is more durable.

66-44 is too much of a drag racing cam for a 600 switchback. You will not like it in the off trail deep snow or for climbing hills. Your back shift will be dramatically degraded with a 66-44. If back shifting is important to you its always a good practice to adjust your drive clutch calibration to improve your acceleration. Use your cam to give you the back shift you need.

You need to grind the 11-64 weights because 11-58, 11-60, 11-62's are not out yet. My dealer has told me that Polaris will have these available next year.

My recommended setup out accelerates the EPI kit and it has better back shift. I used my buddies radar gun to test both and I returned the EPI kit.

What technique do you use to grind the weights and what location do you remove weight?

I used the following with excellent results:


28 degree timing
62 gram weights (exact)
23/42 gears-78 pitch
stock helix and springs.

The lower gears allow excellent deep snow running and backshift. The belt ran several degrees cooler pushing deep, wet Keweenaw snow. I strongly recommend that you start with 410 or 420 main jets with the 28 timing bump. I ran 390 mains and stock air box. The pistons came out badly black spoted on the underside and very lean. The pin boss area had light colored blueing from heat. It was on the verge of burn down. The timing increase requires a bit more fuel for good motor longevity.

how does that setup work on groomed trails? what is the top speed with those gears? thanks

Top speed on ice is a registered 105. Hardpack, 102. Keweenaw's Michigan lake snow, 98-99.

Joe,

Whats the range of peak HP engine speeds, seen on the engine dyno, for a 600 HO? I.E. are some engines peaking at 8200, some at 8300 etc?

Also, what is the range of peak HP on the 600 HO engines?

The reason why I ask is that I have a couple of buddies with new sleds in which I had to put in 10-60 weights to get to 8250 RPM. Temperature was 5 degrees F @ 1000 ft above sea level.

On a long stretch under ideal conditions my tach will hit 8250. HP has been recorded anywhere between 117-124. It seems that compression on some motors was down. Mine registered a little higher than most at 129. The majority of the 600HO's I tested using my gauge were in the 123-125 range. The biggest issues I've found with the HO's was timing and overweight clutch weights. Polaris must of had a run of fat weights. The weights in my sled were just shy of 64 grams. I cut the side down to 62 grams and reset the timing. It runs like it should've from the factory. The timing bump will help with the rpm sag issue using 62 gram weights. I never messed with primary springs with higher initial rates because of the off trail riding I do. I also dislike the belt burning issue when PERC is used with higher engagement speeds.

Hello Guys,
It sounds like you know what you are talking about, so I have a few questions. I just bought a 2006 600 HO Fusion. I am taking a trip to the mountains in March. British Columbia is where I will be heading. The altitude will be between 3000 - 6000 feet. I will be installing a 136" x 2" kit on it for the trip. My question is, what kind of clutch set up do you recommend and will I have to change the gearing too or will the stock setup be okay? One other thing, how do you change the timmimg to 28 and what is it stock?

Thanks.

crt103

Hi Joe,
Your post got me thinking. your comment about some of the Ho motors with their low compression, and bad timing and fat weights out of the factory. I think I may have one of those sleds. My 06 switch 600 has been a real dog, I can't seem to get it over 95mph even on a smooth flat county rd.Off trail isn't a problems runs, and back shifts good. Would you say that your recommendation would be a good start for me. Timing bump, bigger mains, re-gear? Any recommendation would be helpful. I Need Help!!! this sleds motor hasn't lived up to my expectation.

TTT

You can't just blindly start making changes. You need to take the weights out and weigh them to the 1/10 of a gram, and grind if necessary. Then, the timing needs to be checked. Mine ran very well with the stock 26* and dead on 62 gm weights. What have you seen for cranking compression numbers? All gauges are different, but still curious.

AFJ Where did you find the 78 pitch chain?

I've got the service manual for 2006 and the chart jumps from 76P to 90P, 3/4W

TTT

I really want to run AFJ set up but also thinking about getting a BMP pipe mod and hyperlite clutch

Anyone master tuning the hyperlite clutch on one of these sleds? (600HO or Switchbacks). Are they even worth the money? Its about that time I start prepping the sled for the season.

This is my second year with the sled (2006 switchback 600HO) and I left it stock last year (bought as leftover) but the thing really pissed me off it would bog out and not come out of it. It wasn't plugs either because we would put new ones in and it would still do the same thing. The motor would flop back and forth about 500 RPMS or more the gauge would just whiplash its self back and forth the two RPMs I just hope I can figure out whats wrong with this thing. No one else can figure it out as of now.

Any of you guys got ideas?

Also anything new and good for these motors?

How is the timing checked and advanced on these sleds. Does the recoil, etc have to come off or can the dealer check this and adjust easily?

Are the weights a 10 - 62 or are they a 11 - 62? Recently picked up the sled and haven't dug into it yet!

I'd also like to know about the timing. The weights are 10-62's

ttt