'01 Snopro 440 servo motor/exhaust cable help - ArcticChat.com - Arctic Cat Forum

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post #1 of 11 Old 03-31-2007, 05:54 PM Thread Starter
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I'm asking this question for someone else. He has a '01 sno pro 440, he said the servo motor was screwed up. Got a brand new motor. The new motor has places for 3 cables instead of two? Are all the motors pretty much interchangable? Right now we believe the free play is correct, but try to hook it up to the cables and it pulls the valves quite a bit even when cables are in place.

What should the free play be in the cables? Where do you measure it at? After you set the cables and put them into the servo motor it shouldn't be pull much if any correct?
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post #2 of 11 Old 03-31-2007, 10:07 PM
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ZRT 600 01/02 had place for three apv cables I believe

As its a 3cyl with APV

should be no free play

[b]SUMMER SUX
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post #3 of 11 Old 03-31-2007, 11:09 PM Thread Starter
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What should the measurement be to tell if they need adjusting? Where do you take the measurement from?
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post #4 of 11 Old 04-01-2007, 10:36 AM
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Strange, my 01 SM has no listing for a 440 with APV ...
"There are two styles of power valves in use in the 2001
Arctic Cat engines. The “flat style” valve is on the 500
cc and 800 cc twin engines, and the “round style” valve
is on all 600 cc engines."

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post #5 of 11 Old 04-01-2007, 03:10 PM
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ya but the Snopro is not in your manual neither,its not in my CD

[b]SUMMER SUX
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post #6 of 11 Old 04-01-2007, 08:14 PM
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Good point, never noticed that.

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post #7 of 11 Old 04-08-2007, 07:19 PM Thread Starter
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When we hook up the cables it seems like its pulling the valves open quite a ways even when its in its stopped position. Whats the measurement to know if you need adjusting? Where do you take the measurement from? Thanks.
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post #8 of 11 Old 04-12-2007, 12:21 AM
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Sled: 95 ZR580 97 ZRT600 99+2x00 ZR440 SNO-PRO
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<div class='quotetop'>QUOTE (hrc200x @ Apr 8 2007, 08:19 PM) <{POST_SNAPBACK}></div>
Quote:
When we hook up the cables it seems like its pulling the valves open quite a ways even when its in its stopped position. Whats the measurement to know if you need adjusting? Where do you take the measurement from? Thanks.[/b]
Have both a 1999 and 2000 ZR 440 Sno-Pro. The 1999 uses "automatic" APV's, the 2000 uses servo controlled APV's. To adjust, you essentially take up all slack from the cables using the cable adjusters. The valves should not bottom out on the pistons; if they do, something is badly worn and possibly shims would help out. If you have slack in the cables, the valves will stay closed too long and will cause "bog" and "stumble". Now for the three position servo... man, sounds like the wrong part to me. Good luck.

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1995 ZR 580
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2000 ZR 440 Sno Pro (VForce reeds)
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post #9 of 11 Old 04-12-2007, 04:41 PM
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Sled: 2001 sno pro mod with a 136"
As taken directly from my 2001 sno pro performance manual - APV cables specs = 1.24" Min to 1.32" Max - to do this you disconnect the cable from the server, remove any slack on the cable and measure the exposed cable. As far as I know the valves pretty much opan all the way once you hit the target RPM. At idle the vavles should be closed. I usually twist the server to this position while the motor is off and cables disconnected. Once you fire it up and blip the thottle the servo should test itself and the cables by opening the valves at least once.
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post #10 of 11 Old 04-12-2007, 04:49 PM
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<div class='quotetop'>QUOTE (sysanalyst @ Apr 12 2007, 12:21 AM) <{POST_SNAPBACK}></div>
Quote:
<div class='quotetop'>QUOTE (hrc200x @ Apr 8 2007, 08:19 PM) <{POST_SNAPBACK}>
Quote:
When we hook up the cables it seems like its pulling the valves open quite a ways even when its in its stopped position. Whats the measurement to know if you need adjusting? Where do you take the measurement from? Thanks.[/b]
Have both a 1999 and 2000 ZR 440 Sno-Pro. The 1999 uses "automatic" APV's, the 2000 uses servo controlled APV's. To adjust, you essentially take up all slack from the cables using the cable adjusters. The valves should not bottom out on the pistons; if they do, something is badly worn and possibly shims would help out. If you have slack in the cables, the valves will stay closed too long and will cause "bog" and "stumble". Now for the three position servo... man, sounds like the wrong part to me. Good luck.
[/b][/quote]

If I remember correctly the 99 sno pro's had an update kit to the valves. Do you know if this has been done?
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