Power valve & servo motor - HCS Snowmobile Forums

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Old 12-30-2008, 10:05 PM   #1 (permalink)
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I just converted my 06 Snopro to a 700 EFI. For some reason the engine is running real rich, the inner electrodes are black on both plugs. Checked my servo motor (with the cables disconnected from it) and it does not cycle when started. I can't seem to get it to do anything at any RPM, not sure what the deal is.

I would expect this to be part of my problem with the engine running bad, but I want to get this working first before I continue diagnosing the engine. Any thoughts on what to look for with this servo motor problem?

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Old 12-30-2008, 10:09 PM   #2 (permalink)
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Try Blocking off your Oil Injection and running a Pre-Mix through it. Power Valves are over-rated, all they do is make the bottom end more torquey by obviously changing the exhaust port size. Bet you a beer it's your oil injection!
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Old 12-30-2008, 10:31 PM   #3 (permalink)
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Quote:
Try Blocking off your Oil Injection and running a Pre-Mix through it. Power Valves are over-rated, all they do is make the bottom end more torquey by obviously changing the exhaust port size. Bet you a beer it's your oil injection![/b]

Not a bad idea regarding using a premix gas to solve the black plug problem.

Anyone have ideas on the servo motor for the powervalves? This is on an 06 700 EFI motor, it doesn't cycle when started, it doesn't cycle when I'm on the gas ~half throttle on the track stand. Am I missing something? Did is there some other connection in the wiring loom that is critical to the functioning of the servo motor?


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Old 12-31-2008, 06:28 AM   #4 (permalink)
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I would start with checking all grounds. I have had problems there before.
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Old 12-31-2008, 07:09 AM   #5 (permalink)
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Are you using the 440 voltageregulator or one from a f7?
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Old 12-31-2008, 11:39 AM   #6 (permalink)
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Quote:
Are you using the 440 voltageregulator or one from a f7?[/b]

I am running a brand new voltage regular from an F7.
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Old 12-31-2008, 04:17 PM   #7 (permalink)
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i think if the cables aren't adjust properly the servo wont work.
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Old 01-01-2009, 07:57 AM   #8 (permalink)
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On my sled there was a problem with the heaters on the handelbar, I had to disconnect them otherwise the sled would not run ok and also there was no light at all... Try put the sled on a stand and then rev it up to over 7200rpm and have a friend to see if the apv motor turns. If it does but the sled goes into limpmode adjust the cables and if that does not work move the cables to the other side of the servo and try again. Dont block the oil injection cause it lubricates the waterpump also!!
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Old 01-02-2009, 11:25 PM   #9 (permalink)
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on my snopro the servo motor crapped out and i swapped it with one off ebay out of a f7 or something. sometimes it just happens, they get dirty and get rusted on the inside and just stop working. my sled it would cycle then only open the first time i hammered the gas on a stand. you can go on ebay and get one for like $50 bucks "buy it now" all of the servos from like 01 and even through the firecat models are interchangable. if you have a buddy with a cat with powervalves swap it quick and run it on the stand and see what happens. takes like 10 minutes.
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