Engine bogging down

[bigal74848]

Hi,
I have a 06 YFZ 450 SE. I've had it about a month. Went riding yesterday as the day progressed I seemed to devolpe a pretty serve engine bog. Yesterday it was especially noticeable when I give it full throttle after an upshift. Today I was checking everything and you can litterly kill it at idle if you "blip" the throttle. No mods completely stock. Air temp has been cool (cold) 40's late in the day low 50-s.
I'm assuming this is probaly related to jetting but I want to make sure there isn't anything else possibly going on.

tks
Big Al

[bsjoe]

does it pop when decelerating?


I dont belive it really if its stock, but it sounds like your pilot jet is too lean... I'd install a leak jet too, thats normal when your in like a gear and hit it and it bogs for half a second, a leak jet fixes that, but if you say it almost stalls when you do that, It sounds like the jetting.

[bigal74848]

We just pulled the main jet - 155. From what I've read that seems to be off by some degree. I'm not real sure what to move up to anyone have suggestions.

tks
Big Al

[jjm400ex]

should've bought a honda

[250r4life]

Originally posted by jjm400ex
should've bought a honda

ha ha ha... yah- you dont have to rejet those :huh