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Max 8000 RPM with sled on the stand

4

429dhm

Active member
Sep 29, 2008
145
29
28
46
Edmonton, Alberta
I'm having a problem with my sled not revving past 8000 RPM (2012 PRO RMK 163).

I have the correct weights (Carls Clutch Kit) in for elevation, good compression (13.1 head), cleaned exhaust valves, injectors last season and changed the fuel filter.

Even if I put the sled on the stand it will not rev past 8000 rpm. I had the shop install a 280 track last season and never had a chance to ride it is the only thing that changed.

I would have thought it would over rev on the stand.

Thanks
 

Murph

Polaris Moderator/ Polaris Ambassador/ Klim Amb.
Staff member
Lifetime Membership
Miles on primary clutch? last time rebuilt? Weight bushings in good shape?

Because of the nature of torque sensing secondary clutch, sometimes you will not see full rpm because of lack of load.

Are you snapping throttle open or easing into the higher rpm load? Sometimes if you creep up on max rpm you will pull more when running on stand versus pinning the sled wide open.

With the current clutching setup that is installed, did you ever see 8200 rpm?
 
4

429dhm

Active member
Sep 29, 2008
145
29
28
46
Edmonton, Alberta
It has not been reaching past 8000 RPM since at rebuild around 1000 miles and that's about how many miles on the clutch as well.

I dived into the TPS and found the base voltage was very at 0.731V.

I adjusted it to 0.700V so will try again.
 

Scott

Scott Stiegler
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Nov 1, 1998
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W Mont
What was it running last time on the snow?

Areas to check:

old clutch springs
primary clutch bushings
track tension
tps
fuel quality deteriorates over the summer
plugged exhaust or air intake (mice love nooks and crannies in the sleds)
 
4

429dhm

Active member
Sep 29, 2008
145
29
28
46
Edmonton, Alberta
It didn’t run very well last season as well when it was on the snow. Clutches are off to Indy Speacialties for a rebuild, the last item I had to check was the TPS.
 

mtncat1

Well-known member
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Oct 19, 2008
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south jordan ut.
don't run your sled on a track stand at full throttle it is not safe !!!
you probably won't see max rpm on a stand because the clutches are up shifting to fast due to no load on the track , do you tuning on the snow ,you will get better results
 
W
Dec 25, 2008
40
1
8
I had a similar issue on my 600. Only had 800 miles on sled. Ended up being the belt. It looked ok, but I Instantly went from 7900 to 8300 rpm.
 

kanedog

Undefeated mountain clutching champ of the world.
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Oct 14, 2008
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If it won't rev up to 8000 on the stand, it won't do it on the snow.

Sent from my SM-G920W8 using Tapatalk
 

kanedog

Undefeated mountain clutching champ of the world.
Lifetime Membership
Oct 14, 2008
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I hope you get it figured it out. An old timer once said to me "if it won't fully shift out or get to 8000rpms on a stand at sea level, it definately won't do it at 5000ft with snow/track load."

Sent from my SM-G920W8 using Tapatalk
 
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