Air fuel mixture screws

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Air fuel mixture screws

Post  gus on Mon 13 Nov 2017, 4:43 pm

The manual says 1.75  -+  turns out . At that a my 1200 spits flames out the exhaust . Entertaining  , but that's about all going for it . Laughing
I normally go for 3  turns out but cannot remember why .
I went back to 3 turns and its fine , if anything still a little rich .(buy the plug colour ) 
Why does the manual  give me its setting 
While i'm at it 
Gen 1 carb balance , very easy .
Gen 2  carb balance ,TERRIBLE , no space . Someone should invent a curved pair of long nose pliers .Pig of a set up .
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Re: Air fuel mixture screws

Post  paul on Mon 13 Nov 2017, 5:19 pm

I bought a pair of curved pointy nose pliers , for just this purpose .............supercheap I think . I also found with an aftermarket muffler , 3 turns was about right  as well , on my and my sons 1200.

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Re: Air fuel mixture screws

Post  mtbeerwah on Mon 13 Nov 2017, 8:46 pm

Bingo on the 3 turns at being close ...
I do know my gen1's carbs are extremely sensitive.
Mine at 3 turns is too rich, stumbles on take off, and stalls, or slip the clutch. 
To fix mine, and get it perfect, I kid you not, I only have to turn the needles in ,a 32nd of a turn on the screws.
I've got a stubby flat blade screw driver, that I've marked,  16th of a turn markings, and it's half of a 16th=32nd, to stop the stumble, and give it perfect fuelling. If I turn it in a 16th too far,  it starves for fuel,  and bogs down.
It is sooooo god damn sensitive. Then with the changes in the seasons, I have to tweek them again.
Don't get me wrong,  I love it's quirky nature, and now I know the bike,  it's an easy fix,  and I always take the flatblade with me,  on every ride, to fine tune if need be. 
I basically make it as rich as possible on the pilot circuit, just so there's no adverse reactions. 
My gen2 never goes out, although it's got a jet kit in it, with a richer tune in general 
Speaking of carb ballaning, mine never go out, even after 30 000km intervals.

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07 DRZ 400e. Lot of fun with no power. 25 km/L
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Re: Air fuel mixture screws

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