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King Cat Clutching Setup Comparisons

U

U turn

Banned
Nov 27, 2007
482
46
28
Ardrossan, AB
Lets see what everyone has tried, what works and what doesnt..

Mine is 2005 900 EFI with SLP Performance package(SLP head, pipe, porting, airbox kit, VF3 reeds)
Stock gearing and titannium clutch springs and stock helix.
162" Camo Extreme
Stock 19/43 gearing
Riding elevation 5000 to 8500 ft in Western Canada

I'm thinking of leaving the stock Ti primary spring. Dropping 1-2g of primary weight. Changing to straight 51 or 53 helix and trying cat yellow or sno pro green spring. I have a snopro green spring and straight 55 so that might be the first test run. I am thinking of changing to 20/43 on next chain swap out (start of every season or 500 miles. Cheap insurance)

List your sled setups, what you run that works, and what didn't work.:D
 
D

diggerdown

Well-known member
Apr 25, 2004
3,452
677
113
Deer Park Wi.
Leave the weights alone, put a straight 51* helix on, and run Bikemans black secondary spring. It is between cats R/W and Green. Yellow is too soft.
 
C
Nov 27, 2007
1,171
198
63
South Jordan, Utah
I have also went down to a 49* with the stock spring. I really like the 55*-52* Short 55*) as well, which would probably work well with the the black spring mentioned above. The stock 55* works the best, but gets hot and when the clutches get hot, the trackspeed drops in a hurry!!

Make sure you get some good rollers first off and ditch the stock junk. Stock rollers wear out easy and the stiffer springs only accelerate the wear.
 
Last edited:

scoop

Active member
Lifetime Membership
Nov 29, 2007
310
32
28
idaho
clutch setup

(900 efi setup) rkt head, boyseen reeds, air box gutted and scooped out the speedo hole, stock gearing, 162 camo track, sw y pipe and single,slp can. stock ti primary spring 69 gram ac weights, cutler r/w secondary w/sledjunkies hard rollers, 53 degree straight. Runs 7800 to 8000. all day...This is where it pulled the best.
 
U

U turn

Banned
Nov 27, 2007
482
46
28
Ardrossan, AB
Leave the weights alone, put a straight 51* helix on, and run Bikemans black secondary spring. It is between cats R/W and Green. Yellow is too soft.

Digger, were you running this on a stock 900? Curious about leaving the weights alone. I've actually had a few people suggest Polaris weights over Cat.
 
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diggerdown

Well-known member
Apr 25, 2004
3,452
677
113
Deer Park Wi.
Polaris weights have more weight in the tip and back shift a little slower. They do not have the set screws like the cat clutch uses now. The older clutches were interchangable and gave you a chance to try different profile weights. I got a 13/1 comp rkt head and speedwerx pipe. Does not hold 7800 to 8000 like scoop says his sled does, but I have not seen a 900 hold that many R's without twins and a 1 1/2* timing key. They are designed to run around 7500. I guess if you run a lower elevation you may be able to get that many R's, but I run between 8,000 and 11,000 feet, throw a 16 wide track and weigh 260 lbs. geared up, so I don't expect more!
 
C
Nov 27, 2007
1,171
198
63
South Jordan, Utah
Polaris weights have more weight in the tip and back shift a little slower.

Pretty sure you have this backwards. Polaris weights I have seen are lighter at the tip than the Cats weights and more heel heavy. This is why with Polaris weights you run helixes like 66-44 and with Cat weights you run helixes more like 55-52 or even straight. Need a big first angle to force the shift out when you don't have a heavy tipped weight.

Could be wrong though.
 
U

U turn

Banned
Nov 27, 2007
482
46
28
Ardrossan, AB
I have the 16" Camo and weigh about 280 geared up, so maybe I'm expecting to much for it to hold rpm. Maybe I'll just have to use the button more to get it back up to full rpm.:D

I think I will clean up the primary and leave it stock, play with the secondary first with a couple of helix's and springs. Anybody have some spare helix's (51 or 53) the want to sell?
 
D

diggerdown

Well-known member
Apr 25, 2004
3,452
677
113
Deer Park Wi.
Pretty sure you have this backwards. Polaris weights I have seen are lighter at the tip than the Cats weights and more heel heavy. This is why with Polaris weights you run helixes like 66-44 and with Cat weights you run helixes more like 55-52 or even straight. Need a big first angle to force the shift out when you don't have a heavy tipped weight.

Could be wrong though.

We could both be right or wrong! I've got pol. and cat weights with a number of different profiles, but the pol. weights do not have the set screw for the newer cat clutch. As far as gearing goes, you're a pretty big boy and you should gear it down a little instead of up. 20/46 hyvo with a 74 pitch chain is the way to go, but it cost a bit and the chain runs real close to the case. Don't let it get loose. The 900 makes its best power and torque around 7500 and then falls off quick after that. You want to get it to rev up to 7600 to 7700 and then fall back around 7500 on a pull. If you want more R's you will need a timing key and then be carefull at mid throttle.
 
C
Nov 27, 2007
1,171
198
63
South Jordan, Utah
Remember, he has an SLP single, so he wants to run it at 7800-7900 RPM.

I would also get EGT's. When I had my SLP single with porting, my sled would pick up RPM's and run way stronger when I was above 1300 degrees.
 

scoop

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Nov 29, 2007
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idaho
kk clutching

Slp states 76-7900 rpm, speedwerx told me I was okay @ reving to 7900/8000rpm and pulling hard @7700/7800 rpm. By feel this is where my 900 liked to run, w/my combo...who knows how far my tach is off!!!!!!!!! Maybe my tach is 600 rpm off and really pulling 7400 or 8600 rpm who knows????
 
U

U turn

Banned
Nov 27, 2007
482
46
28
Ardrossan, AB
Remember, he has an SLP single, so he wants to run it at 7800-7900 RPM.

I would also get EGT's. When I had my SLP single with porting, my sled would pick up RPM's and run way stronger when I was above 1300 degrees.

I had Redline EGT's, but the gage quit working last year. I'll double check the wiring when I have the hood off, but probably a new Koso going on her.
 

1Mike900

Well-known member
Premium Member
Dec 5, 2007
996
169
43
Bellevue, Wa
Torque load this engine! Stock nothing higher than 7400 rpm. With aftermarket single keep it between 7600 - 7800 max. You guy's with twins I would guess 7900 to 8100 for starters. A stocker with opened airbox, Reeds and a Y pipe mod 7500-7600? Where does a RKT head come into play, Same RPM range?

Mike
 
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Going West

Well-known member
Nov 30, 2007
1,212
643
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Canada
Slp pipe and y pipe, thing can, v-force reeds, rkt head. 71 gram weights yellow primary red white secondary in middle hole and a 49 helix. If you are under 200 lbs a 51 helix. Compound helixs are for raceing not for mountain riding, stick to straing angles.
 

Rixster

Well-known member
Premium Member
Oct 20, 2005
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47
Springville, UT
V force reeds slp silencer gutted air box, running 8000-10500.
68g weights stock spring
53 helix red white (stock spring)
19 43 gearing
I am changing to 20 46 this year.
 
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knuts82

Well-known member
Dec 12, 2007
392
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Bismarck ND
I have also used the cat 48-44 helix with a cat redwhite in the center hole works great with twins or a single pipe. Back shifting is unreal and your not running a ton of spring pressure to wear out your rollers as fast. 6000to12000ft. Primary depends on your pipes but my best results with a single were with a cat yellowgreen and 70gram cat weights. I have also tried heavy tipped healclicker weights and a cat orangewhite but broke a few springs and it just did not run as well, more for drag racing not mountain riding. these primary setups were both with the secondary setup I gave.
 

mmsports

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Nov 27, 2007
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hubsperformance.com
Clutching

On the king cats we always recommend leave the secondary stock seams to work best for all around. Primary I would put a cat Orange white and cat weights for elevation.
Gearing we have a set up we do that is less prone to breaking we use a 46x13 X 20x15 with a 74P chain it gears it down just a bit from stock and usually do not break.

On EFI models the best mod on them is an RKT head and can works good.

And don't forget the drop bracket and taller arm.
 

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