2007 wr450 jetting question.
Posted June 09, 2008 - 02:19 PM
Posted June 09, 2008 - 02:47 PM
Dump the AIS. Not an issue here in BC anyways. Will never be able to get rid of the decel pop or jet it right otherwise. I personally feel it gives a bit of a preformance gain by cleaning the jetting up.
Install the jet kit ( have fun, the carbs a bitch ) and pipe and see how she goes. It should be close to right.
If you still have a bog when you wick the throttle you might want to look into the AP mod.
I have an 07 WR with a 08 YZ pipe, ride about the same altitude as you. The jetting that works for me is a 48 pilot, GYTR needle 4th clip and a 170 main.
Posted June 09, 2008 - 04:24 PM
Do the ORing mod
Get a smaller leak jet (55 or smaller - some go to a #40, depending on the type of riding you do mostly) or an adjustable one.
Jet kit will improve general running but has little effect on the bog. I know the James Dean kit comes with a smaller one (#70, I think), but it is not small enough for most
Posted June 09, 2008 - 07:12 PM
get a fuel screw. install the jd kit, use the recomended setting. tweek the fuel screw until you get crisp throtle. bike will run good.
Posted June 09, 2008 - 07:38 PM
Posted June 09, 2008 - 08:09 PM
Posted June 10, 2008 - 07:37 AM
The stock accelerator pump is lean and you have to use a richer pilot jet to cover for it so the bike isn't really crisp.
I use a 42 p-jet on my 08.