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2007 Honda TRX500 FOREMAN 4X4 ES

FMF Power Up Jet Kit

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FITS: 2007 Honda TRX500 FOREMAN 4X4 ES change
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Product Description

  • Power-Up jet kit makes jetting your carb simple.
  • FMF teamed up with Dynojet to produce a kit that offers a selection of jets and/or needles to get maximum horsepower out of ATV fitted with an FMF exhaust.
  • Easy to use instructions have diagrams and step-by-step procedures to help you get your jetting where it needs to be, no matter the elevation.
  • No more driving back and forth to the dealer with a handful of jets and needles with a million questions running around in your head on where to start.
  • Customer Reviews
  • Ask an Expert
  • Also Offered For
3.9 out of 5 stars
5 star   21
4 star   16
3 star   1
2 star   3
1 star   7
Great product.
bigloghauler99 Location: Arkansas, USA
1-10 of 48
Ease of Installation
Verified Purchaser
Location: Arkansas, USA
Nice kit

Great product. Everything needed to rejet after k&n and big gun eco install.Could have used two sets of instructions instead of combining pre and post '06 trx450r in the same instructions. Got a little confusing but nothing a little common sense couldn't take care of.

Ease of Installation
Location: Ohio
Clean Power Delivery

Performs exactly as advertised. Aside from accessing the carb pretty simple to install. The instruction were clear an easy to follow. Followed the carb setting from instructions and bike started with just 2 kicks after install. Removed dead spot in throttle and can definitely feel the difference. No bog anywhere. Great an improvement in the bottom end.

Ease of Installation
Verified Purchaser
Location: Medina, OH
Jet Kit

This is a fantastic kit my FMF. It was fairly easy to install myself and the gains in power were felt instantly. The instructions are easy to follow.

Ease of Installation
Verified Purchaser
Location: Wenatchee, wa
Don't waste your money

Directions are difficult to follow, doesn't contain the jets you need. It only calls to replace the needle, and spacers. I spent days trying to get it to work then bought a JDM kit and was running in an hour...

Ease of Installation
Location: Tennesee

FMF Customer service is a little weak, waited forever to speak with a tech, then his information was like he was reading from a book. Called back and actually spoke with somone who knew what they were talking about and suggested a fix for the bog I was getting, it worked.

Location: San Jose, CA
Great Purchase

I am very pleased with the extra power!

Location: Kenai, Alaska
Easy power

installed the jet kit after installing a fmf powercore full exhaust system and K&N filter. it really helped with low and top end power while increasing throttle response and acceleration. directions were fairly easy to understand. they should add more tuning tips in instructions because it is very vague on what to do after installed. with these additions my crf 250 rips!

Location: Santa Rosa, GU
Useful kit....?

I own a 350 Warrior with a K&N filter, FMF Q4 exhuast w/power bomb header. My quad was ripping so I was hesitant to change the jet. But, FMF recommended to run the kit, so I did. After reading the informative yet slightly complicated trouble shooting and jet selection page. I installed the needle, main jet, and fuel mix adjustment screw which was very easy(installation directions was great). I notice my stock jet is #145, so I install the recommended jet #148, slightly larger. But when I ran it, at mid throttle it bogged and couldn't run great. I was very surprise, so I changed the jet to a larger #150, and it still bogged. I then decided to install the stock jet back in just to see what would happen and it started to ripp again. The needle setting was the only thing that I found useful in the kit. I did compare the needles and the FMF was slighter more tapered. If you are planning to continue your build or mod, this kit would be great because it comes with many jet sizes for your mod needs. The kit does include #146 which is a size in between the stock and recommended #148(didn't work) that i haven't tried yet, but the stock jet runs SUPER, so I'm gonna leave it until I feel like taking out the carb again. Also, I'm gonna get a CDI with higher RPM to see if that would make a difference. But, I will say that with the jet changes.. my quad does redline a little faster, because I do notice that I have to shift 1st and 2nd gear faster, so acceleration did improve. I also can easily wheelie my quad now, low end seems more responseful. That why I'm giving it a 4 star.


Not even going to leave a monster review story for you guys to read, SAVE YOURSELF THE TROUBLE AND BUY THE JD JET KIT!!!!!

Ease of Installation
Location: Lima, oh

Bought for a 05 trx450 that was a basketcase. I installed a new Hot Rods stroker crank and the quad would start making a weird noise as it approached mid throttle and stalled out if you gave it any more gas. This jet kit is very simple and easy to install for anyone that knows their way around a carb and it really bought the engine to life. HOWEVER! i did not feel like the engine was powerful enough compared to my crf450r's but this is also my first quad every so maybe im not use to the weight difference or still need to change the jets a little for the right set up.. Either way, this kit got the quad moving on its own power and im more then happy

1-10 of 48
Total Questions (29)
Questions with answers:
Questions without answers:
KBen20 Location: Page, AZ, USA
1-10 of 29
123773 1 month 2 days ago
On a crf250r does this work with a stock/oem exhaust?
Expert MotoSport Staff
1 month 2 days ago Location: Portland, OR, USA
Yes, really this kit would help you tune your jetting regardless of what exhaust you are running on your bike.
jebgood 4 months 9 days ago
What jet sizes come with this kit?
MotoSport Staff Expert
4 months 1 day ago
This kit for the 2005 Raptor 660 would come with a range of 5 main jets, 2 smaller than stock and 3 larger than stock. Also included are 2 needles with clips and adjusting washers, as well as, new slide springs and needle springs. There will also be instructions and a troubleshooting guide from FMF with this jet kit.
mike Over 7 months ago Location: Ephrata, PA, USA
270 jet can it be too lean?
MotoSport Staff
Over 7 months ago Location: Portland, OR, USA
A set of 270 main jets in a banshee can be too lean depending on what is done to it and what elevation you ride at. If you have aftermarket pipes on it, I would contact the manufacturer of the pipes for their jetting specifications based on modifications done to the ATV and what elevation you ride at.
KBen20 Over 10 months ago Location: Page, AZ, USA
KX 250F 2004 need jets or what?
Today I bought a 250f and it doesn't start up the recent owner said it only starts when you push start it. It won't start up when kick starting and I was wondering does anyone know what's wrong ? Do I need to get new jets or valves or something to do to the carb? Please help again thank you
MotoSport Staff
Over 10 months ago Location: Portland, OR, USA
Without seeing the bike it is very hard to say what you may have going on. Typically when the bikes get very hard start, it is not a jetting issue. You may have a plugged carb but that depends on how long the bike sat with fuel, and all the circumstances surrounding the issue of it not starting. Did it sit for a while and then not start easily? Did it all of the sudden just start to become hard to start? The 2004 KX250f's were known to have engine valve issues. This is where i am leaning. More than likely the valves will need to be adjusted and possibly, depending on their condition, replaced. If you are not familiar with checking valves, take your bike to the local dealer and have them checked before doing anything else. I assume this is the issue and if not, they will be able to help diagnose the bike better with it in front of them.
j07voysey Over 4 years ago Location: fl clearwater
Does the jet kit tell u witch jets u need to install for each mod?
ti have a 04 suzuki ltz400 with a yoshi pipe and a k$n fillter and i also live in fl does it tell u witch jet u need for that also or is there a jet that does bolth mods to gether thanks
MotoSport Staff
Over 4 years ago Location: P+RTLAND
Since jetting depends on what you've done to your bike and where you are located, it's not going to tell you to run a specific jet because there are too many variables to take into consideration. The jet kit should cover the jets you would need in order to dial it in, but as far as which one to run you can either contact a local shop and they will tell you, or you can contact FMF and they will recommend some jetting specs.
Top 1000 Contributor
Over 3 years ago Location: seneca new jersey
yess it covers everything
bigchad93 Over 4 years ago
I have an 04 yfz 450 with a big gun slip on and a quick shot 2 accelerator pump, will this kit accomidate those accessories?
Expert MotoSport Staff
Over 4 years ago
yes it will. it will include an elevation chart and everything you need for installation
Top 1000 Contributor
Over 3 years ago Location: seneca new jersey
yehh it covers everything
Zacky Over 4 years ago
Is It Hard To Install?
How hard is this to put on a CRF 250R (2004)
MotoSport Staff Expert
Over 4 years ago Location: Tualatin, Or
It is very easy to jet the bike. Just pull the carb off and take it apart
mecasey Over 4 years ago
Will it worrk on an 03 crf450r not shown on the list, i thought they were the same from 02 - 04?
MotoSport Staff
Over 4 years ago Location: P+RTLAND
2003-2004 are the same, if you profile your bike as a 2004 it should be available. Just make sure you switch your year back if you have more shopping to do, I'm having the listing updated as we speak to offer the kit for a 2003.
suzuki121 Over 4 years ago
What jet kit do i need for the Yoshimura TRC pro series exhaust?
i have a 2004 RM-Z250 with a Yoshimura TRC pro series exhaust and i need to re-jet my bike and i dont know what jet kit to get.
MotoSport Staff Expert
Over 4 years ago Location: USA
All jet kits, for the most part, are the same. Some include custom needles, but carburetor jet will be the same whether its a jd or FMF, or OEM kit. I'd suggest the JD jet kit, but that's my preference.
tsamp Over 4 years ago Location: maxwell IA
I have a 2001 blaster wil this jet kit work good on my quad i changed up the gears also?
MotoSport Staff
Over 4 years ago Location: P+RTLAND
Yes this will work on your quad, gearing doesn't effect the jetting at all.
1-10 of 29

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