Lean?
Seasoned HDF Member
Joined: Aug 2008
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From: Ohio
Joe Minton kit works, ran it for several years, I also tune with a AFR wide band reader, it works too. The Mikuni tuning manual is a good one, owners can become familiar with tuning with it.
It is really hard to read by a plug now a days with color except pig rich readings, plug does look lean but conflicting because a Mikuni is known to be rich out of the box to cover a wide variety of engines but fuel mileage is weak and the reason Joe M who wrote the tuning manual for Mikuni created the mileage kit. Anytime it pops out the intake is a lean condition, lean can also pop out the exhaust on de-accelleration, rich can lag when rolling on the throttle.
Attaching a paragraph from a Evo member
The idle mixture screw is actually called the pilot air screw, it's purpose is to adjust the idle mixture. It only affects idleto about 1/8 throttle. If you are under one turn out you are too lean and should go one size larger. Conversly if you are more than two and a half turns out you are too rich and should go down one size.
It is really hard to read by a plug now a days with color except pig rich readings, plug does look lean but conflicting because a Mikuni is known to be rich out of the box to cover a wide variety of engines but fuel mileage is weak and the reason Joe M who wrote the tuning manual for Mikuni created the mileage kit. Anytime it pops out the intake is a lean condition, lean can also pop out the exhaust on de-accelleration, rich can lag when rolling on the throttle.
Attaching a paragraph from a Evo member
The idle mixture screw is actually called the pilot air screw, it's purpose is to adjust the idle mixture. It only affects idleto about 1/8 throttle. If you are under one turn out you are too lean and should go one size larger. Conversly if you are more than two and a half turns out you are too rich and should go down one size.
Last edited by 1997bagger; May 27, 2018 at 07:47 AM.
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Road Master
Joined: May 2012
Posts: 1,001
Likes: 107
From: Houston
Attaching a paragraph from a Evo member
The idle mixture screw is actually called the pilot air screw, it's purpose is to adjust the idle mixture. It only affects idleto about 1/8 throttle. If you are under one turn out you are too lean and should go one size larger. Conversly if you are more than two and a half turns out you are too rich and should go down one size.
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Road Master
Joined: May 2012
Posts: 1,001
Likes: 107
From: Houston
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,082
Likes: 2,159
From: Ohio
Put baffles in it.
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Road Master
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From: Houston
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Road Master
Joined: May 2012
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From: Houston
Idle for a few seconds after a ride. Didn’t have a chance to do a full load shutdown. When I have my days off in a couple days I’ll get to that. Just trying to get the most out of what I have. Not really worried about big numbers, just want efficient.