sxf 250 jetting

Hi everyone

i have an sxf 250 2007 model and when i up the throttle instantly i.e ticking over straight to redline it hesitates then picks straght up, what would be better for me to buy a jd jetting kit or an fmf ? it has a standard exhaust right now and just fitted a new vertex standard piston

all recomendations ans advice would be great

regards Alex

also i have heard somthing about a fuel pump jet or somthing like that that will make it run better ?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By Miles Holt
      So I picked up the YZ250X not that long ago. I live and ride between 4000-6000ft. I run Amsoil saber at 80:1 my current setting is 158 main, 48 pilot, 2nd clip, stock needle. It felt a little sloppy on bottom so I switched the pilot and it works great. It feels really good to me but last weekend at a race it bogged/cut out for a second a few times. And it’s doing similar things now. 
      The first time it did it was 3-4 gear chop/small whoop section where I was just keeping the throttle steady 3/4-full throttle and in the middle of the section it cut out like it was running out of gas. But I pulled the clutch in and revved it and it was ok. It’s done it twice out of a corner, once in a long Sandy whoop section, and it did it twice on the faces of jumps. 
      Each scenario the bike felt like it was running out of gas or fouling a plug in a way, it just sort of happened, and then went away. Obviously I wasn’t running out of gas, and not fouling a plug but it felt kinda like that. 
      The race was at about 5000-5500ft, fairly fast GP/desert race, the course was pretty rough in spots 
      It did it again on me today at 4000 feet, I tried switching the main jet to a 155 but it was too lean. Would switching the needle help? What about float height? Bike has maybe 20 hours on it 
    • By Rixter
      A tiny clear rubber tube on bottom of carb.  On bottom sort of on side, by floats, the other end just hanging down.  Was it always like this? Or does the other end go somewhere?  Today after multiple trys with kick, choke on/off ,,,fuel keeps pouring out the tube.  This bike has always been hard to start.   Thanx  guys!
    • By Doukis1
      New spark plug, new air filter. Went for a ride and all was good. Hadn't run it in a week and a half. Now it won't start. Getting spark. The plug is dry. Is it possible I over oiled the filter and it has somehow gummed up the carb/ float? Thanks
    • By mbennett95
      My 01' yz125 seems to be requiring a large amount of throttle to get off the line. I've ridden plenty of properly jetted 125's and none required quite so much throttle work from a dead stop. Even slipping the clutch it wont get going without a pretty healthy amount of throttle. Thinking it just needs a clutch rebuild kit and maybe a basket. Any info appreciated!
      If it helps any here is what it has done.
      FMF Fatty, VForce 3 reeds, and an iridium plug.
    • By Sam W.
      Hey all, I just bought a street legal 2005 WR250F. Took it out once three weeks ago. Did about 60 miles on the dirt and 15 on the road, bike ran great. I took it out this past Sunday and was about 75 miles into my ride when the battery died. The battery is cheap, but it is brand new and was on a battery maintainer the whole time while it sat in the garage. I kick started it, and it fired right up. I was on the road for about 5-10 miles in fifth gear when I felt the bike slow down a little bit, and I noticed the sound coming from the bike sounded a bit deeper than usual. About a half mile later the bike started to bog down like it was out of gas. I filled the tank back up and experienced the same problem. The bike began to bog down, then puttered out like it was out of gas. Eventually the battery completely died and I was not even able to kick start it. I trailored it home, hooked it up to the maintainer, waited a couple hours, and the bike fired right up with the electric starter and the choke out. However, it was still puttering a lot when it was idling at this time. If anyone knows whats up, I would appreciate any and all help. Thank you. #Yamaha#wr250f