190HP NYTRO Turbo Kit Clutching

[Clode]

So guys what is the hot clutch setup for a 190hp turbo Nytro running at 2500ft to 6500ft? There is a great thread for the higher HP Nytro so lets see what works for the low boost sleds.

 

[towerrigger]

I'l be running this setup. Ran it on a Ulmer kit so I'm thinking it should be as good with the 190 MCX

8BU weights, fully loaded with steel rivets
Orange-Pink-Orange primary spring
14.5mm rollers

Shockwave helix, 1/2 turn out
EPI purple secondary spring 1-0

20-40 gearing

 

[Clode]

Thanks for the info, not to many people out there share clutching secrets.

 

[mewassin]

I have the same primary setup but 43 helix and green cat secondary spring 1-0. What does 1/2 turn on shockwave equal. 19/40 gearing

 

[DaveB]

I have the same primary setup but 43 helix and green cat secondary spring 1-0. What does 1/2 turn on shockwave equal. 19/40 gearing

From the Shockwave page:

The ramp angles can be adjusted anywhere from 42° to 58°. The Adjustable-Ramp Helix fits Yamaha snowmobiles (1995-2012, most models).

Each full rotation of the adjuster ring is approximately 4 degrees. Thus, each 1/4 rotation is approximately 1 degree. Turn the adjuster ring clockwise to raise RPM; turn the adjuster ring counter clockwise to lower RPM.

So 1/2 turn out would be about 44 degrees...

 

[JMS]

I have the 190 mcx installed on my 2008 MTX 153". I'm running the EPI purple, 8bu loaded, and I'm hitting the Rev limiter ALOT.
Any other options or input?

 

[nytro turbo]

Just call Tom Hartman he rocks !!! He will get you dialed in with your set-up. Strongly recommend that you call him. He got my sled clutched perfectly with a mpi kit at 6 psi turbo.

 

[sled obsessed]

would like the details on that mpi setup at 6psi, right now mine is primary G-W-G, secondary P-P, 41 deg helix @ 60 twist and hitting rev limiter pretty good at low elevation, not sure how that would change going up in elevation.
If anyone has thier mpi turbo dialed in for 7-8psi at 6500ft elevation I would sure love to hear the clutch setup

 

[sleslie]

Primary - blue/white/blue
14.5 Rollers
MCX weights - 77.8 grams
Secondary - Arctic Cat Purple wound to 0-1
39* Helix
18-40 Gearing
162" Camo Extreme Track
I'm a big guy, probably close to 300lbs with all gear on.

This setup seems to run pretty strong for me, good belt life as well. One thing i haven't tried is changing the helix, does anyone think there would be a benefit of switching to a 43* helix. I do rev a bit high, around 9000rpm usually, would changing that helix bring my rpm's down just a bit?