Geez, it seems like every one w/ newer YZ 250's are having carburetor problems. Well I'm too. Mine is a 2001 YZ250. EVERY SINGLE WEEK when I go to start it up it will foul about 60 seconds later. I just realized from reading somewhere that I have rich jetting (even though I don't have bogging-EVER) since my bike starts first kick w/out the choke.
MY STATUS:
Elevation- 1025 ft.
Temperature- 70's (missouri)
Main: Stock(178) just bought a 175 though and havn't tested it out yet
Pilot: 48
Jet needle: N3EJ and 2nd clip position
Air screw: 1.5 turns out (stock is 1 turn out)
I think my throttle reponse is near perfect everywhere w/ no bogging. But then again this is my first bike 5 months in. I heard I could have a crankcase (transmission side) seal that has gone bad so tranny oil is getting to my plug making it appear oily every time.
Question : How do you want your idle to be. Do you want to play w/ your air screw until it reaches highest idle. What about the idle screw.
MY STATUS:
Elevation- 1025 ft.
Temperature- 70's (missouri)
Main: Stock(178) just bought a 175 though and havn't tested it out yet
Pilot: 48
Jet needle: N3EJ and 2nd clip position
Air screw: 1.5 turns out (stock is 1 turn out)
I think my throttle reponse is near perfect everywhere w/ no bogging. But then again this is my first bike 5 months in. I heard I could have a crankcase (transmission side) seal that has gone bad so tranny oil is getting to my plug making it appear oily every time.
Question : How do you want your idle to be. Do you want to play w/ your air screw until it reaches highest idle. What about the idle screw.