2003 zr 900 - HCS Snowmobile Forums

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Old 11-01-2011, 11:21 PM   #1 (permalink)
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Default 2003 zr 900

Hey guys, i'm looking for information on what i need to bring my stock Zr 900 from 3500 rpm to 4500 rpm engagement
thanks!
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Old 11-02-2011, 07:12 AM   #2 (permalink)
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There are many variables at play when it comes to set up. Depends on the weights you are running - at idle and the entire combination when underway.

I like the AC orange white primary spring, should be close for engagement RPM however you need to consider things after engagement.
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Old 11-02-2011, 07:36 AM   #3 (permalink)
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x2 what Scott stated. you can't jump up 1000R's without effecting the shift pattern elsewhere. you will need to change your weights as well. is the machine running the original clutching now?
gdmorning guys
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Old 11-02-2011, 08:24 AM   #4 (permalink)
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yes its all original clutching, purple spring and 71.5 gram weights in the drive, 55/53 cam, red/white in the driven, i want to put the engagement up as i made this into a 144"
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Old 11-03-2011, 06:15 PM   #5 (permalink)
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You'd prob be ok with a Yellow/white, me personally, I prefer a low engage, that motor is made for it. If you're going to race all day its fine but for better trail manners lower is better.
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Old 11-13-2011, 06:57 PM   #6 (permalink)
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try the maroon epi spring, mine engages at 4100 in my opinion thats more that you will ever need with this stump puller engine
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Old 11-13-2011, 09:31 PM   #7 (permalink)
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4500 is pretty high for that torque monster..there is always notched weight option too..your weights are close to mine.. i'm at 4000 so a orange/white should get you close without effecting to much...R2R
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