Can someone explain O-Ring mod? - Polaris Riders
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post #1 of 13 (permalink) Old 03-10-2009, 07:44 PM Thread Starter
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Can someone explain O-Ring mod?

After searching around quite a bit, I decided to give the O-Ring mod a try. I honestly felt like the quad ran so much better today with it on. The only problem is, I'm not fully understanding the function of the O-Ring. Can someone clear it up for me, or send me to a link that describes it a bit better? Everything I have found simply shows how to install the O-Ring.

Thanks for all of the help guys, my quad is running SO much better now with the few things I've done.

2007 Polaris Outlaw 525 IRS
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post #2 of 13 (permalink) Old 03-10-2009, 08:06 PM
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The only thing I can suggest so you really understand what it does is to take off the side plate and press the throttle a little. Don't do this too many times or you will get a lot of fuel in your intake.

The accelerator pump is spring loaded, and when the throttle is opened, it allows the spring to expand slowly. With the o-ring mod, it pulls the on the accelerator pump which throws more fuel into the intake charge. It doesn't put more fuel in overall, it just puts more fuel in the intake in a shorter amount of time. The o-ring is designed to give the pump some give, but yet speed it up a bit. Hope this helps out.

Nick

2009 Outlaw 690S
2008 YFZ450
2012 Sportsman 850HO EPS
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post #3 of 13 (permalink) Old 03-10-2009, 08:23 PM
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Yeah, watching it really makes it clear, as to what it does.
It made mine alot more responsive.

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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post #4 of 13 (permalink) Old 03-10-2009, 09:00 PM
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It makes the AP pump every time the throttle moves basically, with a little give. From my experiance, if the rest of the tuning is not right, you will not notice it as much.

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2009CUSTOM OUTLAW525XCR8/06 CAM
2009 OUTLAW525IRS 8/33 CAM
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post #5 of 13 (permalink) Old 03-10-2009, 11:19 PM Thread Starter
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Well, at this point I'm not certain that my tuning is accurate. I haven't personally been inside of my carb, so I'm uncertain which jets are in there. I bought the bike used, so who knows if the previous owner even touched it. I definitely was noticing more hesitation on quick throttle snaps before the O-Ring mod, and I didn't feel it very much at all today. I'm just really stoked about how well the quad rides now that I set the idle up higher and put the O-Ring in... I'm certain it will just get better as I dial it in this summer.

I'm definitely not the fastest guy around, as I'm still getting used to this machine. However, on the few drags that we did, my buddy on his YZF450 with intake, full exhaust, and correct jetting could not put any distance on me. I really didn't expect the 525IRS to hold with him with the tuning as it is right now, and the fact that my quad is completely stock... I don't mean to turn this into a "my quad is better than yours" thread, but today was a good day for me.

2007 Polaris Outlaw 525 IRS
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post #6 of 13 (permalink) Old 03-11-2009, 01:39 AM
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I was sold on the 525 IRS at Silver lake in Oct of 07. A guy had one that had 10 hours bone stock and was keeping up with everything there in drag racing and was pulling from my Modded 500 outlaw. They are fast for a stock quad. Problem is that they do not see really huge gains from pipes and intakes like the rest of the quads out there.

Point being, the Outlaw is the best bang for your buck out there!!

Visit the new Polaris Tech Site www.POLARISPROS.com Established Sept 2010

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2009CUSTOM OUTLAW525XCR8/06 CAM
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post #7 of 13 (permalink) Old 03-11-2009, 06:31 AM
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Taking the lid off, is by far the best mod for the 525!

From there, the gains get smaller and smaller, but a pipe did help mine out.

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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post #8 of 13 (permalink) Old 03-11-2009, 12:24 PM Thread Starter
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deadman... I'm confused. I read another post from you that stated the rear spacers were by far the best mod for the 525! haha

Either way, I have an Outerwears prefilter on the way, and I'll be going no lid once I get it on. I also have my eyes on some rear spacers, as I'm interested to see how it slides with them on.

Thanks for the tips you guys.

2007 Polaris Outlaw 525 IRS
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post #9 of 13 (permalink) Old 03-11-2009, 01:36 PM
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I had more offset rims on my outlaw for a little while which basically imitated spacers. Did not like it at all. just my .02

07 Outlaw 525LE B.O.D. 3/21/07 -42mm carb by sredrum, JD Kit, Big O-Ring, No lid, K&N, Custom intake, CT Racing Sonic Full System, 15 tooth sprocket, 20x11x9 shedders, 20x11x10 8 paddle haulers.

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post #10 of 13 (permalink) Old 03-12-2009, 07:09 AM
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Gablett, why did you dislike it wider? Just asking, I have not tried it wider, but was considering it. Just currios what was the dislike? Thanks.

Oh ya, and how much wider were you??

2007 525--JD jet kit+Titanium screw,PP Nerfs(Pro Armor)+Heel pocket(REM), EHS lid,UNI Filter, BRAP Bolts,Vapor computer,PP Hand Guards,GPS Tab,12 volt accessory outlet, rear fender braces,PP Frt.+ Rear grab bar, 15 tooth sprocket,(updated rear suspension),I-razr's on 10" Douglas, KTM slave/case saver, Case vent (Thumper Racing), Muzzy full S.S. system
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