Question about 2004 Honda CR 125 R

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Hi i wondering if i change my original pipe and muffler for a fmf tune pipe and a fmf muffler do i have to change some jet too.

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There is no need to change jets. Messing with them will do more harm than good.

Posted on Jul 14, 2010

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Posted on Jan 02, 2017

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Need 3000 ft elevation jetting for 2002 yz250 with fmf SST pipe and fmf spark arrestor


Hey Anon,
Proper and correct jetting is something that can only be achieved in person by a REAL MECHANIC that KNOWS how to "read" a spark plug,,,With the mods you mentioned.. you need to know the stock jet sizes..a close guess would be reduce the main jet by two or three steps and lower the needle one clip position... oil mix should be at least 32:1....or better yet 28:1.. KEEP the oil mixture and jet the carb for performance....( I see TOO MANY IDIOTS that instead of jetting a carb correctly just reduce the oil ..some as low as 50:1(INSANE) just to keep from fouling plugs.).. then WONDER why their engine doesn't last long... hahaha????
YOU > BE SMART!!

Aug 25, 2013 | 2005 Yamaha yZ 250 F

1 Answer

I was wondering what kind of jets and needles I should put in my 99 yamaha banshee after I just rebuilt it. It is bored 80 over, has fmf pipes. what would be a good jet to start with?


whatever a professional manual or pro sez-jets are a delicate thing cause you cud end up rebuildin again--the web n fixya has books or getta hold of a motocrosser

Aug 26, 2010 | 2003 Yamaha YZ 125

2 Answers

WHAT SIZE MAIN JET AND PILOT JET ARE STANDARD WITH THE BIKE


Hi and welcome to FixYa,

On a 2003 Kawasaki KLX125, these are standards:
  • main jet - 145
  • pilot jet - 17.5

Good luck and thank you for asking FixYa. Happy Holidays.

Dec 18, 2009 | 2003 kawasaki KLX 125

1 Answer

2008 KTM 200 EXC carburetor jetting/tuning


Hi, Leoniekitche if you have changed your engine size, fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" you're not getting enough fuel.
1. Close to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. A wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, the engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Carburator Theory and Tuning
How to Tune Adjust KTM 2 Stroke Carburetors
1999 2010 KTM 125 200 SX EXC Service Repair Manual pdf pdf https://www.partsfish.com/page/oem-parts-for-ktm
http://www.karlstrommotor.se/upload/PDF/KTM08/repman125-200.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Dec 17, 2017 | 2008 KTM 200 EXC

3 Answers

Exssive oil from tail pipe yz 125


Hi, when you change your pipe to the FMF you reduced the back pressure and gave it more flow. That causes it to run a little "rich". Look at your spark plug and check the color of it, it should be a nice tan color. If its a dark brown then you need to "lean" out your bike. The easiest way to do that is by taking the slide out of the carb and taking out the main jet, the lock washer is set to the middle position for a stock set-up. Move it down 2 notches and then run it and see what your plug looks like. The black "goo" is the unburned oil from not running lean enough. Another trick to try is run a NGK-EV plug. it burns hotter so it will help with the oil problem (and make it a little more snappy also). And as an added bonus it will be easier to start.

Aug 21, 2009 | 2003 Yamaha YZ 250

1 Answer

Just looking for general advice...on FMF Pipe Install


i changed my pipe on 07 dt125lc and did not rejet, seemed fine until i holed a piston. best to rejet me thinks, about £20 instead of £150 for piston rebore bearings and jets plus the time to re build.

Apr 25, 2009 | 2003 Yamaha YZ 125

2 Answers

Crf 150f backfire


change the jetting...youcan contact FMF for thier setup recommendations for running that pipe with the bike...very common problem and jetting will take care of alot of the issue

Mar 31, 2009 | 2003 Honda CRF 150 F

1 Answer

The best pipe/muffler 07' ec200


I am not sure as to where you wwant more power. I hear the JD needle makes the bike smoother. If you need more bottom end power a switch for 13:52 gearing will help LTR power valve cover a POWER NOW PLUS POWER NOW (carb divider plates), FMF Gnarly for bottom end, and a 2K2 igntion. As for your jetting it sounds like you could go down on the pilot one size and raise the clip up one position.,,,

Nov 10, 2008 | 2008 Gas Gas EC 200 Hobby

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