Viper Running 105 at 9,000 RPM

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Tysonmatc2

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Jan 8, 2010
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Age
39
Location
SW Wisconsin
Does this sound right? I had it out yesterday, came upon a nice open stretch so I opened it up, I was running 9K RPM and hit 105 MPH, I think it there would have been more straight away I would have either gone faster or blown it up.... Thoughts? Also, after that I met up with a couple of guys, went for another ride, warning light and engine symbol were flashing, but we had just gone across a long concrete bridge with no snow which just makes me cringe my teeth, but I put it in the powder right away after and it stayed on, when I got home I called Viperking and he tole me to turn my thumb and handwarmers off, this worked but wondering if it was correct or if that just resets the code??
 
Tysonmatc2 said:
Does this sound right? I had it out yesterday, came upon a nice open stretch so I opened it up, I was running 9K RPM and hit 105 MPH, I think it there would have been more straight away I would have either gone faster or blown it up.... Thoughts?
Click to expand...

If your motor is stock the max rpm should be 8400. Pipes can be up to 9100. Top speed varies with alot of factors. Track, outside temp, snow conditions,rider weight,condition of sled, skid,bearings, hyfax, clutches,and so on.
 
9000 rpm is too high. Try a search for over rev there should be lots of reading. Sled should be pulling 8500. You need to add weight to the tips of your flyweights to bring down your rpm. Is the sled all stock?
 
Yes it is all stock, I am about 250lbs with my riding gear on. So do I just not give her all the throttle until I find a fix to the RPM? I did bypass the TPS sensor.
 
You won't blow up at 9000 rpm. Its just wasting rmp's. The Vipers stop making power after 8400 rpm. Clean up the clutches and add some weight to the tip . I believe they come with 3.5 in the tip. Get some 4.5. I buddy had the same over rev so I put a washer in along with the rivet.
 
I see what you mean by different conditions, last night I went out and the sled was running OK but I was running about 8900 RPM's and the sled was only going about 95 to 98 mph on a good straight away. I lined up with a 04' Ski Doo Rev twice and had him off the line both times but only for about 25 to 30 feet then he passed and left a good 4 to 5 sled lengths the rest of the way. How and where do you find the different weights for the clutches and what should I use to clean them, will carb cleaner or brake dust cleaner suffice? Or will that ruin the aluminum? Thanks all for the help!
 
Tysonmatc2 said:
Yes it is all stock, I am about 250lbs with my riding gear on. So do I just not give her all the throttle until I find a fix to the RPM? I did bypass the TPS sensor.
Click to expand...

I think you mean the TORS[Throttle Overide Sensor] it is situated right where the throttle cable attaches to the carb rack.

The TPS[throttle position sensor] is the black sensor that is at the PTO end of the carb rack. Don't bypass or unplug it.
 
I make a trip to the carwash and pressure wash the clutches. Then I blow them out with compressed air. A second wash of brake clean and compressed air makes them sparkling clean.

Your local Yamy dealer has rivets for the clutch.
 
When talking about top speed yes I was using the Dream Meter :) Another side note, our trails have a good layer of ice under about 2.5"s of packed snow so I could be spinning on the ice...? I will give that a shot for washing the secondary this weekend, I am also going to spray down the Power Valve bolts with some PJ-1 and hope I can take them out without breaking them off and clean those this weekend as well. Yes, the Throttle Override would probably be it... 2 wires on the pull cord side, unhooked them and plugged them into themselves basically.
 
My 2cents,
Rode in central WI, 300 miles the last few days.
just cleaned both clutches a week ago.
Ran WOT on lake, (on speedo)
Saturday ran 8600 rpm @ 95 mph (warmer, sunny, softer snow)
Today Ran 8900 rpm @105 mph (cloudy, cooler, hard snow,ice)
Snow conditions, temperature, etc, all have an impact on speed, rpms, etc.
My machines are bone stock.
I would clean clutches but if you are running a stock sled , I would not be in a big hurry to change out stock weights. MY 2c
 
Thanks for the replies, I think I will clean the clutches and see how it goes after that. I just wanted to check with people on here to be sure I wasn't going to blow it up running 9000 rpms down the stretch. I think a definet mod for next year will be some pipes and a clutch kit to go along with my 136" stretch I am doing this spring.
 
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