05 rich or lean question
Posted September 11, 2005 - 04:53 PM
Posted September 11, 2005 - 05:00 PM
Did your bike come with the ais smog crap ?? if it did , get the smog removal kit . you also may have the wrong needle in there, I had a big studder until I put the jd red needle in the bike..what is your fuel screw set at ??
G'Day Guys, I'm having a few hassles getting my jetting perfect. I have looked at the jetting database and done a lot of jetting in the past but I reckon this may be better answered by someone who has been there before. It's an 05 WR450, needle from the spares kit supplied (not the single clip position needle), standard exhaust with the restrictor and spark arrestor removed and a larger diameter tail pipe replacing the standard pea shooter, 170 main, 48 pilot and the rest standard jets. I have the YZ throttle stop, done the air cut mod blocking the vacuum port, disconnected the grey wire and removed the intake snorkel. I've done a full throttle plug check and it looks perfect, the bike starts easily, warms up on the choke, then idles a little roughly without the choke about 2 - 3 minutes after starting. When it's fully warmed up, pulling the hot start raises the idle slightly (suggesting the pilot is rich). When hot it starts without the hot start (suggesting the pilot is lean). It backfires when I back off at medium to high speed (suggesting lean pilot), I need to adjust the fuel screw and idle speed often to get a stable idle and when at higher altitudes the idle is more unstable often hanging up high (suggesting the pilot is rich). The biggest problem is climbing slow, twisty, slippery, not so steep hills where you need constant but small (1/4 to 1/2) throttle openings. The bike surges making it tiresome to keep on track. It has no problem blasting up really steep hills at larger throttle openings. It feels lean to me but I was wondering if you guys have experienced this and how you fixed it. Usually surging and popping like this happens when a bike is lean but the higher idle when the hot start is pulled in and getting worse at higher altitudes stomped me. Wodyareckon?
Posted September 11, 2005 - 06:05 PM
Posted September 11, 2005 - 06:21 PM
I need to get a 50 pilot jet cause my fuel screw is way out.
Make sure your header is perfectly lined up and you may even need new exhaust
gasket.This can cause some wicked backfiring.
Us in Australia don't have to deal with that AIS crap.
The surges are probably your accelerator pump working with an unsteady hand.
I am on the 5th clip using a JD red needle, If you are on the 3rd clip, go to the 4th.
If you are rich, it will run rough, coughing and farting. Lean it will bog. I have changed
my needle position many a time, It doesn't take long at all.
I see you have done the air cut mod, I would put it back to standard as this richens it
when you back off so you don't get the lean effect.
Get a fuel screw off ballards if you don't have one, it is well worth the $50. This could
be your problem.
Posted September 11, 2005 - 06:42 PM
Posted September 11, 2005 - 10:58 PM
Posted September 17, 2005 - 09:44 PM
Posted September 18, 2005 - 04:24 PM
Posted September 28, 2005 - 04:19 PM