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'07 wr450 fmf pipe/jetting

By kevinwr450f,
in WR400F/426F/450F

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PROWLER 58

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Has anyone with an '07 wr450 had any luck with one brand or kit over another? I have a FMF TI Powercore slip-on with all free mods, Please advise.?

Thanks

I just ordered (after talking to several here that helped my decision) an FMF Speed slip-on that requires no jetting. Its a new pipe, Just recently developed. Bob

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JSanfilippo

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I just ordered (after talking to several here that helped my decision) an FMF Speed slip-on that requires no jetting. Its a new pipe, Just recently developed. Bob

The stock pipe with the pro moto billet insert and the airbox opened up requires re-jetting jeez. :bonk:

I have no idea what FMF was thinking recommending that a wide open pipe not require re-jetting:crazy:

What elevation? What temps? What other mods?

Start with 48 pj and a 168 main. The stock jets are going to be lean for a pipe like that

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kenny1234

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i have 07 with fmf powerbomb and q4 silencer i too have done all free mods bought a jd jetting kit and followed instructions to a t just knew something was not right so took bike on dyno rather than jds recommended 148pj and 168 mj i m down to a 145pj and a 160mj and still could go leaner on both dont know if jd kit is aimed at bike with ais on but i ve removed mine bike runs good at min though so i m leavin it for time bein

just my 2 cents

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PROWLER 58

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Ive already installed the GYTR ais kit(with jets) and all free mods. When I put on this FMF Speed I hope thats enough. FMF didnt recommend no jetting, several guys here on the forumdid, they didnt change their jetting , and their bikes ran fine. Im hoping for the same results, if not Ill have to deal with jetting.

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Just_a_trail_rider

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Ive already installed the GYTR ais kit(with jets) and all free mods. When I put on this FMF Speed I hope thats enough. FMF didnt recommend no jetting, several guys here on the forumdid, they didnt change their jetting , and their bikes ran fine. Im hoping for the same results, if not Ill have to deal with jetting.

I have the fmf factory 4 with the 96db insert. I run 48 pj, jd red #4 and 168 mj. Before I put in the 96db insert, I ran a 170 main and it was great.

I get just a little popping at about 2500 feet. But as I climb higher, its perfect. Starts every time, runs like a champ.

Dealing with the jetting is not so bad. it takes 20 mins at most to change your jetting.

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KennyMc

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I have the exact same setup. FMF TI Powercorp slip-on with the AIS removed, grey wire removed and the air box snorkel removed. I installed the JDJetting kit per the instructions. Main 168, pilot 48 and red needle on the 4th clip. I would look at his recommendations when applying them to your riding climate. The bike works great.

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KennyMc

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Kenshaw720,

Whats the AIS? Do the OZ models have them? Also this is the loudest exhaust ever. I put the96db insert in and it is still loud. I guess its the price you pay for bling...:ride:

The AIS is the Air Induction System (smog pump). It probably is only a US or California contraption (POS).:foul:

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Sycamore

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Hey Gang,

I'm new to the 4 stroke gig as I just got mine last Monday. I've been doing some homework but I'm running out of time. I've got an out of town school to attend and not long after I have a Grand Canyon trip planned:ride:

So far I've got the stock silencer mod done and the air box mod done. I just recieved the AIS kit and before doing the mod I wanted to make sure of a few things.

Jetting: The AIS kit comes with some jets to put in but how do they know the conditions I ride in? Are 4 strokes different in this regard? Do I jut put them in per the instructions and call it good?

My typical riding elevation is from 1200-4000 feet 80-95+ degrees in the summer and 50-80 degrees in the winter. My Canyon trip will put me at about 8000 feet do I need to adjust for this temporary trip?

While I have the carb apart I want to make sure I have everything I need.

As far as I know:

ZipTy fuel screw part FMS01

Anything else?

Thanks!

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KennyMc

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I put the JDJetting kit in my 07 and it has run great. I have riden from 1300' to 8400' without making any adjustments and have had no problems. I installed the 168 main and 48 pilot with the red needle on the 4th clip. I also installed the Zip-Ty fuel screw but like I said, I have not had to adjust it.

My GYTR AIS removal kit came with a 175 main but I have read that that was a bit rich. I never tried it, I went with JD's recommendations.

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Sycamore

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I put the JDJetting kit in my 07 and it has run great. I have riden from 1300' to 8400' without making any adjustments and have had no problems. I installed the 168 main and 48 pilot with the red needle on the 4th clip. I also installed the Zip-Ty fuel screw but like I said, I have not had to adjust it.

My GYTR AIS removal kit came with a 175 main but I have read that that was a bit rich. I never tried it, I went with JD's recommendations.

Good info THANKS!

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  • 7 months later...
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Idaho450

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I put the JDJetting kit in my 07 and it has run great. I have riden from 1300' to 8400' without making any adjustments and have had no problems. I installed the 168 main and 48 pilot with the red needle on the 4th clip. I also installed the Zip-Ty fuel screw but like I said, I have not had to adjust it.

My GYTR AIS removal kit came with a 175 main but I have read that that was a bit rich. I never tried it, I went with JD's recommendations.

I've got my '07 jetted the same way and saw a big drop in mileage from stock. Did you notice that?

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