500 VES Carb Settings - HCS Snowmobile Forums

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Old 11-03-2011, 01:09 PM   #1 (permalink)
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Default 500 VES Carb Settings

What are you guys all running for carb settings? Mains, pilots, needle position, fuel screw, and air screw? thanks

Right now I'm running 47.5 pilots, 400 mains, needle in pos. 3 fuel and air screw at 2 turns out. It falls flat on its face when i give it gas. I will be changing the 47.5 pilots out for the stock 45's, and possibly going down to 390 mains. Thinking about trying needle in pos. 2, air screw at 1.5, fuel screw at 1.75
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Old 11-03-2011, 01:18 PM   #2 (permalink)
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why did you go up on pilots in the first place?

And, do 1 change at a time, changing all 5 circuits at once without knowing what you want to accomplish...
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05 Classic Touring 600 - in need of a track and some skid parts
02 XC800 - slightly stock, 136" - 15000 miles, still on original crank (knock on wood) - ready for retirement
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Old 11-03-2011, 01:34 PM   #3 (permalink)
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Years ago the guys pretty much left these sleds stock except for 390 mains and a tweak of the fuel screws. If your riding in warm temps above 10f degrees you can raise the needles a clip to the 2nd notch... otherwise best left stock.
Make sure your air jets are not clogged....they can collect belt dust.
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Old 11-03-2011, 04:27 PM   #4 (permalink)
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I changed the pilots just to see if it would fix the "clicking" noise I kept hearing. Haven't gotten to the bottom of that yet. It's pretty normal from what I hear, I just want it gone though...
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Old 11-03-2011, 06:41 PM   #5 (permalink)
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pilots back to 45, mains at 390, needle clip on 3, fuel screws 1/2 turn out, air screw 1.5 turns out runs great now!!!
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Old 11-03-2011, 10:26 PM   #6 (permalink)
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thats great
not sure what you mean with the 'clicking noise' though
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'11 Assault Switchback
05 Classic Touring 600 - in need of a track and some skid parts
02 XC800 - slightly stock, 136" - 15000 miles, still on original crank (knock on wood) - ready for retirement
00 XCR800 - Pro-X rear skid w/lowered front arm, otherwise stock. My trail rocket
99 XC700SP - 12000 miles - needs work
97 XLT SKS 2up got it for free - 13000 miles and still runs good
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Old 11-03-2011, 11:24 PM   #7 (permalink)
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Quote:
Originally Posted by ivar View Post
not sure what you mean with the 'clicking noise' though
It's a knock/click noise while the engine is revving down somewhere between 3-4k rpms. I've been told the following that it could be: Sway bar, carb slides, primary clutch, powervalves, detonation. And most people say it's completly normal. There's guys out there that have ridden on sleds that sounded like this since new. I believe there is something causing this, and I want to know what. I don't care if "yours ran 10,000 miles like this without a problem" I want to know what causes this since not all of them do it. Not so much for the sleds sake, but I HATE the noise. When it makes the knock noise, you can really feel it in the top end/powervalve area when you put your hand over them. At first it led me to believe it was the powervalves. I did everything to them I could possibly think of, and I know it's not the valves. I cleaned them, added more spring pressure by putting washers inside the ves housing, put new springs, new bellows, etc. I know its something motor related. Someone suggested adjusting timing, they said that fixed theirs. He has an 05 600, I forget his username. That is probably what I will try next. I've looked at the pistons through the exhaust and intake side, taken the head off, NOTHING looks damaged or out of place. It has 120 psi both sides. If anybody has any input it'd be greatly appreciated!

p.s. I got this sled last march, put 100 miles on it, hit 90 mph, its not that it's not "running right" just want to know what the sound is

Last edited by Indy-500; 11-03-2011 at 11:27 PM.
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Old 11-04-2011, 03:39 PM   #8 (permalink)
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I've experienced a rattle from day one on my 05 600 which is the sway bar. Last year i was getting buzzing like chatter....traced it to a broken rod that inserts from the footrest into the outer rolled edge of the tunnel for support. As far as the motor itself....nothing abnormal i can hear coming from my engine. Check your tps voltage....maybe its on the high side causing some deto. Have read other 500 liberty ves owners here complaining about the same thing so your not alone.
Years ago we swapped a 600 cdi unit out with one from a 500 for tests and it made the 600 motor ping like no tomorrow so maybe thats the culprit with the 500 just not as noticeable or to be worried about.
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Old 11-12-2011, 02:39 PM   #9 (permalink)
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On my 06 500.
stock 45 pilot, clip in #2(stock), 400 mains(410's are stock), air screws at 1.25 turns(stock), and the fuel screws are at 2.75 turns out(3 is stock).
I ride at a 900-1100' elevation, and above 0 F.
The sled runs strong.
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Old 11-13-2011, 05:32 PM   #10 (permalink)
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unplug the tps and run it. if the noise goes away your base timing is to far advanced.
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