WR450 Hard to start when hot
Posted October 05, 2005 - 06:51 AM
Temp:90 plus,sea level (houston)
Main-172,pilot-48,fuel screw-2.5 turns,needle-JD red-5 ,YZ cam
Posted October 05, 2005 - 07:12 AM
Posted October 05, 2005 - 08:02 AM
Try leaning out your pilot to a 45 or a 42.
Posted October 05, 2005 - 08:26 AM
Posted October 05, 2005 - 09:16 AM
BTW, if you're 2.5 turns out on the fuel screw, using a 48 pilot, then you shouldn't need to go leaner on the pilot (assuming it's running good like it is). If it runs better when you turn the screw in, maybe it's time for a leaner pj.
Posted October 05, 2005 - 09:46 AM
How have you guys been doing on dead engine start races?
Posted October 05, 2005 - 09:57 AM
Posted October 05, 2005 - 10:16 AM
But, I do beleive that the answer for gettting the "1-kick start" is in having your jetting dialed in perfectly.
Posted October 05, 2005 - 11:43 AM
I've experimented with trying to kick start off the line, but just can't get consistant, so I've stuck with my e-start method. I also have a bad habit getting excited and opening the throttle too soon and flooding it . I try to keep my right hand completely off the throttle when starting.
You really need to have the jetting perfect for this to work consistantly. At 90 degrees (2000 ft elevation with stock pipe, BMP insert, open airbox), I run a 45 pilot and a 65 starter jet. The starter jet seems to have the biggest effect on easy starting, but I could be wrong.
Posted October 05, 2005 - 12:38 PM
Posted October 05, 2005 - 03:53 PM
Posted October 05, 2005 - 04:03 PM
I had to go to a 50 pilot jet, but I use JD red #5, 168 main.
Don't go leaning out the pilot!
If your jetting is fine (it looks like it is), just practice your starts.
Don't twist the throttle when you start also.
Posted October 16, 2005 - 12:16 PM
May be worth just checking your shims before you do too much messing with jets etc, especially if it was starting ok from warm a little while back.