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08-25-2010, 05:39 PM
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Junior Member
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Member #6766
Join Date: Aug 2010
Location: maine
Posts: 2
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Predator 500 jetting question?
Hey i'm from maine and new to this forum i just sold my 1999 blaster an 400 bucks for an 03 preddy i love it so far and i've put a k&n drop in filter and a fmf power core 4 slip on i havent rejetted yet only a couple rides but it goes mint plenty of power i wanna know do i need to rejet? And to what size ? I don't wanta burn it up so what should i do? Any help please
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08-25-2010, 05:41 PM
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Super Moderator
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Member #193
Join Date: Feb 2009
Location: Port Angeles WA
Posts: 11,419
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Welcome to the board! 
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08-25-2010, 06:11 PM
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Junior Member
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Member #6766
Join Date: Aug 2010
Location: maine
Posts: 2
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well, thanx. no info though?
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08-25-2010, 07:50 PM
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Super Moderator
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Member #230
Join Date: Feb 2009
Location: The UP of Michigan
Posts: 5,566
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depends on a ton of variables. contact FMF and ask what they recommend for jetting. they should know. then take into account that the K&N flows more air, so you may need to go up one more size, you may not, just depends
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08-27-2010, 12:11 PM
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ATV Enthusiast
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Member #3702
Join Date: Mar 2010
Location: NH
Posts: 75
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A little rich is better than a little lean. You need to rejet. I ride a similar Pred and use a mikuni (not dynojet) 165 main, 45 pilot, 2 3/4 af and 2nd from the top slot on the needle jet. Assuming your not at a high altitude.
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2005 Predator
Stage 1 Hot Cams CFM oil tank UM nerf bars and heel guards
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1997 Trailboss
Jet Kit DG pipe
Modded cylinder fitted w/ 400 V-Force reed valve
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09-01-2010, 10:18 PM
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Junior Member
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Member #6932
Join Date: Sep 2010
Location: Plumas County, CA
Posts: 4
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How about Dial-a-jet? I put one on mine and I live at 5000'. Works pretty cool. At higher elevations, just turn it 1 click to lean out the mixture, opposite if you're at sea level. Beats tearing apart the carb each time. So far, so good and less than $100.
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09-02-2010, 02:32 AM
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Polaris ATV Junkie!
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Member #3177
Join Date: Feb 2010
Location: West Virginia
Posts: 814
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I have a Yoshi pipe and a aluminum airbox w/ a K&N. I just jetted to a 170 Main, 3 turn on the A/F screw, and 2 groove from the top. My Pred is running 100% perfect, zero hesitation and no backfiring or other issues.
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07 Polaris Predator 500
Yoshimura RS3 slip-on
UM Racing aluminum airbox w/K&N filter
ITP Holeshot HDs
Pro Aluminum skids, nerfs, and bumper
Powermadd handguards
Shockwears shock covers
PRM radiator scoops
PD 13T front sprocket & X-ring chain
Amsoil oil w/ K&N filter
Engine Ice coolant
ODI Rogue Grips
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09-02-2010, 10:58 AM
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Supporting Vendor
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Member #1219
Join Date: Aug 2009
Location: McHenry IL
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Welcome! Cool name BTW! 
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03-15-2011, 05:35 PM
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Junior Member
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Member #6962
Join Date: Sep 2010
Posts: 19
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?air fuel screw pred 500 04
Which screw is this a/f screw,,Im looking at the diagram on bikebandit but its vague just saying screw...
Thanks 727
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03-26-2011, 06:34 PM
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Junior Member
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Member #10816
Join Date: Jan 2011
Posts: 7
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I have a problem I just put a hmf full exhaust rejetted put in a 165 and needle jet on 2nd slot cfm airbox with 2 k&n air filters bug my predator is really sluggish what does that mean?
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