This may be because I´m stupid and I don´t know anything, but i came across something strange.
I checked the jetting thread last winter and jetted my bike after what i saw was the closest to what others had done who had done the same mods as I.
I also followed the carb tuning advice in the sticky.
The bike has been running Ok this summer, but a bit rich.
I also changed the exhaust from some European GYTR thingymajingy to a full YZ450F exhaust with a modded long original WR450F can.
Now i have to go down a size in pilot jet because i can screw the fuel screw all the way in?!
Earlier the fuel screw was about 1,5 turns out.
How can a pipe change have this effect?
Especially with a bigger higher flowing pipe?
When i reach the bottom of the fuel screw, the bike is nearly dying, so do i really need to re-jet?
I do not want to change the jetting each season, so if i can leave it as is, and adjust the fuel screw this winter, i would be really happy,
but what say the experts?
Is it bad to have the fuel screw in the bottom?
Can i go down a size in pilot jet and still have it run great this winter with only a fuel screw adjustment?
I´m going back in the carb anyway this fall to add a easy adjust fuel screw, so changing the jet is no problem, I just don´t want to to it again next summer.
In the summer we can reach 95F and in the winter -31F ~
Best regards, the newbie
Edited by Agazza, July 27, 2016 - 06:10 AM.