05 Wr450

Just got it and ride between 3000-8000'. I have about 60 miles on it now and have installed an FMF Q pipe, skid plate and radiator guards. It really runs good at the upper rpm level but stumbles mid range (saw the jetting thread and will experiment). I have not cut the grey wire or performed any jetting thus far. Would like suggestions for improvements. This is a really nice bike; I was riding an 87 XR600 and the weight/suspension and acceleration are a lot nicer on the WR.

Try and disconnect your TPS on the left side of the carb and see if your midrange stutter goes away. It only takes a few seconds. If not then rejetting will be necessary to richen the midrange. :applause:

Hey Indy - Did you get 490cc by boring only, or did you also stroke? Who did you use. Thanks :applause:

I was going to stroke it with a Falicon heavy stroker crank to a 502 kit but they wanted 10 weeks to deliver it. I had to rebuild her with a standard new crank. :applause:

OK disconnected and ran fine but terrible backfire so I reconnected. I was at 8,000 ft plus. It runs OK but the way it ran with the TPS disconnected was great. Just need that backfire to go away.

Spend $65 for the JD jet kit and another $20 for the zip-tie fuel screw. If you like your bike now, you will LOVE it after these mods. Go to the jetting forum to get hints on the setup. :D:D

Todd

05 wr450

fmf Q, jd jet kit, zip-tie fuel screw

Also, remove the AIS. TT sells a plug kit.

I'm not sure what main jet you have in there now, but that or the needle position has got to be the culprit (I'm assuming the grey wire is pulled).

I'm not sure what main jet you have in there now, but that or the needle position has got to be the culprit, you've got to cut the grey wire too.

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