Muzzy slip on And KN filter 525 irs

[mtgrizzlymn]

Guys are you jetting at all with this setup or just leaving it alone and riding. if rejetting i live at 3500ft and ride up and machine is a new 2008 polaris 525 irs left over. thankyou for any help on carb changes

[gen3usa]

seems like most guys have been saying that the main jet should be changed to a larger one, i think they come with 148, i bumped mine to a 155, im adding the HMF QRS slip on and a TPI air valve for the airbox to be able to adjust the air.

[mtgrizzlymn]

No needle changes though. 148 to 155 isnt to much. i havent even touched this thing yet and all my other machines have mikunis so im sure the kehin(if im correct) has different jets.

[gen3usa]

i may be going up on the pilot since the slip on flows so much more. maybe a 45 pilot, now im at sea level and ride from 0-2500' and dont need to worry, im not sure if your elevation is much to be concerned as the 4 stroke is not as temper mental with jetting.

[birdman7389]

I'm @ 165 with a muzzy's and uni-filter......plus the JD blue needle and big o-ring.

[mtgrizzlymn]

so a 155 would prob be ok then right for my altitude.

[birdman7389]

It's hard to "shotgun" tune the jetting, But If it were me I'd try a 160, for a couple reasons.

1. I'd rather be rich, than lean
2. The Outlaws are crazy lean from the factory, they should have been ~155 when stock, IMO

[sleddog66]

With a muzzy, uni-filter, and ehs lid, I am at 168main, red JD needle in 5th, Big o-ring mod, up to 48 on pilot, 1 turn out on screw. This is good for about 50-75 degrees, 900ft altitude. Also running E-10 fuel.:D

[mtgrizzlymn]

should i just order a jet kit for it? Looks like JD or dynojet which has the best instructions for setups?

[sleddog66]

The JD kit is a matter of opinion. I like mine, but some say it is a waste. The needle is the only difference, but you also pay for his expert advice if you are having problems. I bought it for the needle, and I think it is better IMO.

[mtgrizzlymn]

well i guess i will wait until monday when my slipon muzzy comes and see if it includes any instructions at all. Hopefully it will. Thanks for the help guys looks like jd if i go with a jet kit.

[birdman7389]

The Muzzy did not come with jetting instructions, IIRC.

polarisowners.com has a big section on jetting outlaws, lots of good info there.

also check out

ktmatvhq.com

and

ktmtalk.com


TONS of info on the KTM motor and its carb/tuning.