400ex carb hop-up
Mar 8, 2000 | 03:56 PM
#1
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Weekend Warrior
Joined: Dec 1999
Posts: 24
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Hey Ya'll, got a question for ya...
I've got a '99 400ex and went up to a 40 on the pilot jet, no problem. I hear now the hot set-up is a 160 main jet,White Bros CDI box(or a XR-250) and 3 turns out,from the seated position,on the air screw. Question is-what does the air screw have to do with the main jet? I thought it worked with the idle circuit,and the main worked with the venturi.
I've got a '99 400ex and went up to a 40 on the pilot jet, no problem. I hear now the hot set-up is a 160 main jet,White Bros CDI box(or a XR-250) and 3 turns out,from the seated position,on the air screw. Question is-what does the air screw have to do with the main jet? I thought it worked with the idle circuit,and the main worked with the venturi.
Mar 8, 2000 | 11:05 PM
#3
Weekend Warrior
Joined: Mar 2000
Posts: 8
Likes: 0
listen to your brother-in-law! go out 2 1/2 with
a 160 main jet. check the plug. if that does not
work,....sell it and buy a banshee. I heard you
were a yamaha man anyway! if you would ride the
400ex and quit saying its your wife's you might
like it!
a 160 main jet. check the plug. if that does not
work,....sell it and buy a banshee. I heard you
were a yamaha man anyway! if you would ride the
400ex and quit saying its your wife's you might
like it!
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