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WTB 26 tooth Mpi supercharger pulley. Found steel alternative?

jgustman

Expert
Joined
Feb 25, 2005
Messages
202
Age
50
Location
Cottonwood, MN
Country
USA
Snowmobile
'10 Nytro RTX
LOCATION
Cottonwood, MN
Hope to spot a MPI 180 kit pulley, 26 tooth. I have found the steel alternative that gates makes, wondering if I can just use one of them instead.

 

Hope to spot a MPI 180 kit pulley, 26 tooth. I have found the steel alternative that gates makes, wondering if I can just use one of them instead.

Isn't the 180HP level 28/28?
 
No, the Yamaha Low altitude OEM had a 26 tooth lower for rtx/xtx. I just bought a different sled and already has the 28/28 for 3,500-6000 ft.

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What altitude are you using the machine at?
I used to have a dynotech subscription. The 26 drive and 28 driven was 170 @9200 at sea level.
The 28/28 was 180 @9200 at sea level.
 
Hp is irrelevant, looking at boost. We ride around 1100-1300 feet. My rtx is easily boosting over 7 psi on cold days with a 26 tooth lower. I don’t want to risk boosting more than 5 running 91 octane. So the 28 is out. It’s been bouncing off the rev limiter when I punch it seeing 9300+ briefly.. Running Ulmer‘s clutch kit. Added heel wt per his recommendation which helped but seems to want to under rev once shifted out. This is all going to change a bit on the 2013 xtx with 1.75 track I just bought. Any suggestions on clutching that?
 
Last edited:
That 26 tooth sprocket won't fit, the backside needs to be machined to gain clearance on the seal holder.
 


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