Air/Fuel screw - Polaris Riders


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Old 04-22-2008, 11:05 PM   #1 (permalink)
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Default Air/Fuel screw

So my stock air screw fell out with the spring, washer, o-ring, alll if it.... I had an aftermarker adjustable screw that I bought from KTMHutt.com but ever since I put that in, I had the off-idle stumble that I never had. So, that being said, I stopped at the KTM dealer since it is closer that Polaris and picked up a stock screw for the 07 525. I put it in toninight and found that it is much longer and actually sticks out of the carb about 1/4" to where it could be adjusted, maybe.... I got it started after putting it back together and it fired right up, rode it around the yard, and no issues. The screw seemed to be correct, just longer to where it is not tucked up inside. I will let you know if it takes care of the stumble when I have the chance to get it nice and warmed up.
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Old 04-23-2008, 02:48 AM   #2 (permalink)
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ive never had that one happen before or even heard of it, you get 10 points lol
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Old 04-23-2008, 09:21 AM   #3 (permalink)
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Yeah, the guy at the shop where I dyno'ed it and the KTM dealer said they have both seen it. I need to put something over the new screw so that I can guarantee it doesn't happen again!
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Outlaw 525 - B.O.D. of 12/08/06

-AC Blackline Propegs,
Pro Taper Contour bars w/ Protaper grips,
PRM Grab Bar,
PurePolaris Front Bumper,
JD Jetting,
Clear Guard red headlight kit,
20x11x10 Haulers on Douglas .160's for Silver Lake
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Old 04-23-2008, 09:28 AM   #4 (permalink)
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I have had adj screws come out before, just not on this bike.
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Old 04-23-2008, 09:57 AM   #5 (permalink)
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My adjuster made mine run like CRAP. Stumble down low was unreal, and adjusting it never got rid of the miss. I put the stocker back in, at 2 turns out, and stumble was 100% gone. Its amazing how much that screwed me up.....I was changing the needle and everything all because of that stupid adjuster.
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41mm Carb with Transition Ring, Ceramic Coated Header, HMF Competition Series Pipe, Custom Full Intake, Polaris Bob Oil Cooler Adapter with Custom Cooler, Rath +3 A-arms, ALBA Anit-Vibe kit, 15 Tooth sprocket, Pure Polaris Nerfs, Pure Polaris Handguards, Pure Polaris Front Bumper, Fox Float Evol X Shocks (front), Fox Podium X Shocks (rear), PRM 6 pack rack, PRM Rear A-Arm Guards, Pit Posse Shifter, Daytona Digital Tach, G-Force Wheel Spacers, IRazr Radials, Thumper Racing crankcase vent, LM1 A/F Meter. 48.6 WHP, 37.53 Torque.
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Old 04-23-2008, 10:49 AM   #6 (permalink)
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True story

I was loading my hybrid quad on my trailer forits much anticipated first trip to the dunes when it all of a sudden it dies as the front tires hit the trailer ramp. I had been warming it up in the back yard and the freaking aftermarket fuel screw I had bought from JD jetting fell out. And I did not have the stocker!!!! I thought I was done for. Called my local well stocked KTM dealer and low and behold not only did he have two of them on the shelve but he stayed open for an extra hour so I could get up there on my way up north to pick it up. They get all of my business now!!



And on my bike, the factory fuel screw made the bike run better down low too! [img]/CFIDE/scripts/ajax/FCKeditor/editor/images/smiley/msn/thumbs_up.gif[/img]
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570 Thumper Racing kit w/ 12.5 - 1 CP piston.
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Old 06-11-2008, 11:13 PM   #7 (permalink)
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So aftermarket fuel screws are bad news?
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'07 Predator 500 LE (resto in progress)
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Old 06-12-2008, 12:43 AM   #8 (permalink)
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so far they are..........
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2009 OUTLAW 525 IRS.

41mm Carb with Transition Ring, Ceramic Coated Header, HMF Competition Series Pipe, Custom Full Intake, Polaris Bob Oil Cooler Adapter with Custom Cooler, Rath +3 A-arms, ALBA Anit-Vibe kit, 15 Tooth sprocket, Pure Polaris Nerfs, Pure Polaris Handguards, Pure Polaris Front Bumper, Fox Float Evol X Shocks (front), Fox Podium X Shocks (rear), PRM 6 pack rack, PRM Rear A-Arm Guards, Pit Posse Shifter, Daytona Digital Tach, G-Force Wheel Spacers, IRazr Radials, Thumper Racing crankcase vent, LM1 A/F Meter. 48.6 WHP, 37.53 Torque.
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Old 06-12-2008, 12:59 AM   #9 (permalink)
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As much as I hate to say it, but yes, they suck! If you have the chance, take a close look at a factory fuel screw and any aftermarket one under a magnifying glass and you will see that the tips are not even close to being the same shape between the two. There is a big difference!

There are a few vendors out there that sell an add on tip, that is knurled, that is glued on to the factory fuel screw that will allow you to make on the fly adjustments if you feel you need to. But I have yet run into a situation where I have ever needed to adjust my fuel screw in the fieldafter setting it the first time.
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2003 Polaris Predator / 2004 KTM 525 exc 6 speed motor.

570 Thumper Racing kit w/ 12.5 - 1 CP piston.
Head ported by Thumper Racing w/ new intake seats done by Pro-1 racing.
Stage 5 cam ( Custom design by Thumper Racing )
AC bearing mod.
Oil system mod by DJH.
KW valves ( stock size )
* #100 CDI dirt bike CDI.
42 mm FCR carb by Walt/ Fast64ranchero. ( SX carb = No TPS )
Trail Tech -10 oz flywheel. ( Stock is 30 oz/ trail tech = 21 ozs )
Mino water pump. Full flow set up, no T-stat.
PB Oil cooler.
Custom modded intake. Uni filter/ D2 moto adapter on a modded Predator intake tube.
KTM dirt bike header connected to a modded PP/ White broes muffler w/ turn down tip.
( Soon to have a KTM Bill modded CT racing full exhaust system. )
Tusk Clutch kit.
Honda thumb throttle.
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Old 06-12-2008, 09:35 AM   #10 (permalink)
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Bob- can you point me to where I can get the add on tip?
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'08 Outlaw 450 MXR
-UNI vent filter and clamp-on w/ Outerwears
-JD jet kit
-F2racing FastCap
-Spark arrester removed
-Odi Oury grips
-TMD aluminum oil sight plug
-Mino water pump
-PermaCool oil cooler

'07 Predator 500 LE (resto in progress)
- Twin Air clamp-on, NC modded carb, HMF Sport slipon, 558 BB kit, TrailTech X bars, Spider M1 grips, deep offset rear rims, Dura Blue front wheel spacers, and an assload of powdercoating
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