How do you know if your power valves are working ?

NB-NYTRO

NB-NYTRO

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Joined
Oct 30, 2004
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Location
Moncton
Like it says.. Is there an easy way to tell if my power vavles are working? I'm sure they worked last season. I had it in for service and now it seems that I have no top end at all and the sled won't run at the right rpm. It also seems to be burning a alot of gas as well. I noticed that its not running the power valve cleaning cycle at start up either. Is there and easy way to tell if they are working or not?
 

You could pull the cover off the power valve motor, put it on a stand and run it, see if the motor turns the cables. If that works and you still have trouble, then you would have to unbolt the power valves from the motor and see if the cables pulled through or if the valves are gummed up. This is very easy do do either.
 
The dealership just had them apart and cleaned them. They never said there was anything wrong with them. I have put 90kms on the sled since having it serviced. I made an appointment with them tomorrow. I will have to see what they say.
 
If your not acheiving top rpm's it could be simple things like a primary clutch that needs to be rebuilt.
Or even dirty carbs.
I once had dirt in my cards on my polaris xc 700 and it would run fine till 7000rpm's i could not get to the peak of 7900 on that machine. After a complete cleaning of the carbs i was back up to 7900 rpm's.
 
I am only getting like 8,000 and then it climbs to 8,200 after a long run. The sled was just serviced from A-Z. I installed the green spring and 54/43 helix. It could be a clutch problem. I will find out tomorrow.
 
You should get 8600 on top, Ive seen someone else on this bord complain about that clutch set up. You might be better of going back to stock and see what rpm's you pull.
 
I am considering it at this point. I'm debating. The labour is going get expensive if I keep playing with this. What do you guys think? Go back with the stock 47 helix and red spring? anyone on here get the 54/43 helix and green spring to work good?
 
if you sell it, sell it to me ;) and then maybe I can get it to work, or be in the same spot as you in a few weeks after installing lol!
 
NB-VIPER said:
I am considering it at this point. I'm debating. The labour is going get expensive if I keep playing with this. What do you guys think? Go back with the stock 47 helix and red spring? anyone on here get the 54/43 helix and green spring to work good?
Click to expand...

I ran the 53/43 green spring last year with no low rev issues. Top on a lake run was 85-8600 RPMs no issues. Added the original Heelclickers this year. So far so good!! :WayCool:
 
I 'am runing the 53/43 with the green spring at a 60 wrap and everything else stock. I did several runs with no over rev issues. So far I'am very happy with the setup. 8400 @ 72 mph, 8500 @ 82 mph and 8600 @ 92 mph. I could run it WOT, not enough straight trail for safe run. It made the sled very zippy with lots of smooth powerband and great top end for me. I bought this helix setup from blueblooded, works for me? I will taking up to Muni in a couple weeks. nb-viper your under rev maybe somthing else? Ask Turk.
 
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Thanks for the replys. I think it might be the power valves not working. I taking it in the morning to the dealer. Could it be a carb problem as well?
 
they just cleaned the carbs and now it eats alot of fuel and won't rev??? Take the cap off the float bowls and see if theres a main jet in one that fell out cuz someone forgot to tighten them...................
 
I took it to dealer today.. I told them I don't think my power valves are working. They swore up and down and down no way.. They looked at them anyway. The power valve on the pto side came apart they said. I took it for a little spin around their yard. It seems run and sound better. I will let you guys know how she works after my run on Sunday.
 
Well I did 240kms yesterday. The sled pulls hard off the line and rips all the way to top end. It revs to about 8,400-8,500. I have spring wrapped at 70 degrees and I had the 4.5g weight added last year. I also have engine tourque limiter. Its definetly accelerates a hell of alot faster all the way to about 176kms on the dash. Now If I could just get some traction (need a hacksaw or something) and do some thing with my suspension. Oh my back hurts today. Ha-ha. Its real smooth coming down after a huge jump. I know that now. I was going down this old rail bed doing about 165kms and for some reason there was good sized hump in the trail. I was in the air to the point where I was looking at the sky for a good while. I must of been in air about storey and a half and landed good distance from the jump. That scared the shit of myself. I wasn't expecting it. My buddy saw me go from behind. All he I could do was hold on tight. Lucky for him he had some prior warning as he saw me launch in the air. Its the moguls and the stutter bumps that suspension doesn't goble up. I would love to race a stock Viper and see how bad I beat him. I am going to try and go to the midnight drags this season in March and see how she works against some other sleds.
 
If you havent already done so, revalve the shocks to your weight with pioneer perf. they did mine, and what a difference :) was real quick turnaround as well. about one week from the day I shipped to having it back in my hands. well worth the $$ :) sounds like the clutching is worht the $$ :) did you need the weight to get teh r's down? mine is spot on now and is stock. just wondering if I will need to add weight or not
 
My sled originally reved to like 8,700+ out of the box. I added the 4.5gram rivet and it brought the rpms down where it should be. If yours already runs at the right rpm then you should be good to go. Now if I only had a track like yours I would be all set.
 
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