Polaris Shift- Fuel Screw setting and Jetting - HCS Snowmobile Forums

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Old 01-11-2008, 08:06 AM   #1 (permalink)
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I will be changing my jets and Valve pistons this weekend on my 06-600 ho- to reflect the current jetting on the 08 IQ Shift- Does anyone have the fuel screw settings for the Iq Shift? Has anyone made any other jetting adjustments to stock with good results?

New jetting for my 600 ho includes- 400 Mains- 1.0 Air Pilot- #45 Pilots - 3131206 Valve Pistons - Notched 2.0
Fuel screws ??



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Old 01-11-2008, 10:35 AM   #2 (permalink)
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I will be changing my jets and Valve pistons this weekend on my 06-600 ho- to reflect the current jetting on the 08 IQ Shift- Does anyone have the fuel screw settings for the Iq Shift? Has anyone made any other jetting adjustments to stock with good results?

New jetting for my 600 ho includes- 400 Mains- 1.0 Air Pilot- #45 Pilots - 3131206 Valve Pistons - Notched 2.0
Fuel screws ??[/b]
My brother usually re-jets his customers 06 600 Fusions to 390 to 400 mains & 50 pilot jets.
Sets the fuel screws so the engine revs up a bit at idle, when warmed up, if req'd choke to drop rpms.
Usually have to just slightly touch the throttle to start when warm.
If fuel screws are set too rich, poor MPG, engine will not rev up much at idle when warmed up.
Take several spark plug reading, the 10% ethanol runs leaner!

Our Polaris dealer usually re-jets his customers 06 600 Fusions to 380 to 390 mains & 50 pilot jets.

Then most likely your 600 will be faster, start better, run better then my 07 Dragon "Dog" 700 CFI, Poo's CFI IS BAD NEWS!!!
If I ever purchase a Polaris again (most likely not) it would be a carb version, as Poo can not get their CSI HEAD OUT OF THEIR ASSSSSSSSSSS!!!
Good Luck; Rich
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Old 01-11-2008, 10:40 AM   #3 (permalink)
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Thanks Rich, Because the fuel screws are so hard to get at I would like to get close the first time when I have the carbs off for rejetting- With my current jetting the fuel screw spec is 1 1/4" turn, Is it the same for the shift as that is the jetting I am using.
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Old 01-11-2008, 10:59 AM   #4 (permalink)
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Quote:
Thanks Rich, Because the fuel screws are so hard to get at I would like to get close the first time when I have the carbs off for rejetting- With my current jetting the fuel screw spec is 1 1/4" turn, Is it the same for the shift as that is the jetting I am using.[/b]
I usually start with the fuel screws at a 1 1/4 turn also.
I know it is a real pain in the ariss to remove & install the air box, make sure the carbs air fully into the air box.
I usually spray the carbs & air box rubber flanges with WD40, a little easier to re-install.
I think that the Shift has slightly different needles then the 06 600 Fusions?
Check spark plugs, at mid & top speeds!!!
Good Luck; Rich
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Old 01-11-2008, 11:04 AM   #5 (permalink)
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Rich, the needles are the same on the 06 fusion and shift PN 3131438- I was carefull in ordering the complete jetting package.
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Old 01-11-2008, 12:45 PM   #6 (permalink)
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I tried the Shift setup in my 06 and it was way too lean, I needed to put the 50 pilots back in, but I also have an SLP airbox mod. Currently I have 410mains and 50 pilots with the 1.0PAJ fuel screws at 1.25 needle in the stock position with the 08 shift throttle slides. Seems to work pretty good like this but it doesnt seem as good as it could/should be. I chose the 410 mains because I want to be safe in the event of a big temp difference when I am on a trip and I HATE working on those carbs!! I may try changing the needles again once, but I am afraid this is the best it is going to get.....pretty disappointing! You would think these engines would run better than like say the old sleds from the mid 90's but as far as run quality, I am not a fan.
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Old 01-11-2008, 02:27 PM   #7 (permalink)
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I tried the SLP air box mod and was not happy with it- My sled was way less responsive and boggy- I reinstalled the horns and shelf- the airbox does need to respond to engine pulse and is tuned that way from the factory- If polaris sent the shift out with this jetting I am assuming that it is safe to - 18 f- at least as their chart suggests? What could be different on the 600 ho fusion?

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Old 01-11-2008, 02:54 PM   #8 (permalink)
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I checked all of the part #s for the stator, cdi, pipe head, cylinder, ex. can and even checked the timing specs. Its all the same except the cdi and cyl. head. My thinking on the head is that its different because of the coolant input but I cant confirm that. As far as the CDI I cant get anyone, not even the Techs at Polaris Ind. to tell me one way or another.
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Old 01-11-2008, 03:21 PM   #9 (permalink)
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In terms of run quality at lower speeds is it improved with the shift jetting? Gas mileage ?
I think I will stick with the 410 mains to be safe- That gives me the option of adding a tempa flow safely at a later date.
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Old 01-11-2008, 03:30 PM   #10 (permalink)
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I would say the low speed run quality is far better than stock, I couldnt believe how bad it was from the factory. But like I said before, it is far from perfect. Give me back my 98 xc600!!
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