JD Jetting CRF450R 06 Problems


47 degrees

Problem is that from idle to fast open throttle, it bogs.


Stock bike - fine (no jd kit yet)

Added boysen quickshot - fine

Added PC Ti4 GP system - Bog begins

Added JD Kit

- Blue needle clip position 5 from top (instructions said position 4 but I miss counted, oops)

- 180 MJ

- Fuel screw 1 3/4 out - still bogging - turned fuel screw gradually until fully in with no change.

Repeated these steps with 175, 172, 170, 168, 165 MJ's with no change.

With 165 MJ left in I moved the needle clip one higher (pos 4) and no change.

Moved two clips higher (pos 2), no change.

Changed MJ to 175 and clip to position 6. Again turning the fuel scew in, no change. Turned fuel scew out and started popping.

Stopped here so I don't piss off the neighbours, hopefully start tomorrow if the guru's help in time. I have no idea where to go next because I don't feel like the bike is giving me any feedback.

your are riding while testing right?


I take it i should be? :thumbsup:

yes,go back to the suggested setting.then take it out for a test.

what it does in nuetral on the stand is not a real indicator of the jetting.

Ok, will do, thanks.

Thing is I don't remember it doing this on the stand before but this bike is pretty new and I am new to the 4 strokes.

Thanks for you quick response by the way, you are good man :thumbsup:

Burned, please can you help me again. Its seems I have been really messing up here.

I tried to follow your sticky for the pilot jet circuit and mistook it for the MJ's in my JD kit so I need to start again.

I am going to go back to the 180 MJ and blue needle in clip 4. Then bike on stand I am going to determine my pilot circuit, starting by turning the fuel screw 1 3/4 turns out.

Ok, I have been turning the screw in to lean out the circuit and nothing has happened. Should I have turned it out to find the peak if I could not notice any change by turning it in? Therefore if I find a peak when going past 2 turns out I would need a bigger pilot jet?

Is this correct? If so, what size pilot jet would you recomend? My PJ is stock at the moment.

Sorry to be a pain in the butt!

if you turn the fuel screw full in with no change you need a smaller pilot jet.

Waiting for pilot #40

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 Rick Mcqueen Art
      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 
    • By Ndh87
      I’ve got an old barn find ‘83 CR80R that needs either a new carb or a rebuild kit. I haven’t been able to find either anywhere. 
      Does anyone know where I can find either?
      housing, bowl and all the hard parts seem fine, if I can find a rebuild kit with a new float I think I’ll be ok. Right now it runs but only when I leave the choke on, smokes heavily and likes to bog down on takeoff