JD carb kit is coming along with the Powercore...
Posted January 07, 2005 - 06:32 AM
Posted January 07, 2005 - 10:13 AM
Posted January 07, 2005 - 12:11 PM
Posted January 07, 2005 - 01:14 PM
Dont forget mine has almost 12,000. miles on the engine, almost 3000 miles since the last valve adjustment, pinched (choking) and leaking fuel line and a small header leak to contend with when you rode it. Rebuild should make it run great again! I also found that my vacuum lines dont seat well anymore and I am replacing them with new tubing and clamps. I cant wait to run the new 490 kit (the stock spec is actually a 439)
Posted January 07, 2005 - 01:18 PM
Posted January 07, 2005 - 06:45 PM
NCMM, I'm still using the stock header. I'm not sure if I will change it. But who knows, after a taste of extra power from these existing mods, I may develop an appetite for much more! I'm considering the YZ camshaft still. But that (if it happens and it may not) will come when my first valve adjsut comes up. Thanks again you guys!
Posted January 07, 2005 - 07:19 PM
i just don't believe it s needed on the 04.
What about a 01. Indy just explained to me by PM how he would set a 426 with a PC4 and a JD jetting kit. I might not have the monney to afford a JD kit it in the next couple of months (I got to stop those bike expenses somehow). What would be the best settings with the stock needle? (300-2500 feet, 20-90 degrees)
Thanks to you guys
Posted January 08, 2005 - 04:36 AM
Posted January 08, 2005 - 07:20 AM
Posted January 23, 2005 - 05:25 PM
the 04 needle was upgraded from 03 i run mine at the 4th clip(stock) with 170 main 50 pilot i hate to say it (sorry dan) mine runs better than dans with the JD needle being the only difference in the setups. the coupla times i rode his bike it had a very noticeable hesatation /stumble at around 1/4 throttle(maybe it'll go away with the new 490 gorilla kit!!). now this is the same bike same jetting,same exhaust same powernow,twinair etc. the only difference was the JD kit. i believe the 03 had problems with the needle but i also believe that the change they made in 04 cured it. my 04 has run flawlessly with the stock needle(at the same altitudes you run). i would try the exhaust first,changing the pilot to 50(48 with the quiet core) and the main to 170. and if it runs great send the jet kit back. did you get the powerbomb also?? get the sx version if you do.
I have an Aussie 04 wr450 with the powercore iv s/a muffler and standard header. I have no idea what the jetting is as I bought the bike second hand. The bike has all the standard mods and it runs like a dream. I have acquired an SX powerbomb which I will install soon. From your experience, will I need to change the jetting once I install it.
p.s. Does mountainman like mountin' women?