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  #1  
Old 25-09-2008, 10:00 PM
BlackEagleS BlackEagleS is offline
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air/fuel mixture screw - sportster

i am right in saying the air/fuel mixture screw goes in to reduce the air and increase the fuel....or am i going a little mad (sounds like a song) cos the plugs seem to be even blacker than before
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  #2  
Old 25-09-2008, 10:12 PM
Rodders
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Re: air/fuel mixture screw - sportster

The idol screw is out for more fuel (Blacker plugs) In for less (White plugs)

Aim on the rich side.
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  #3  
Old 25-09-2008, 11:37 PM
BlackEagleS BlackEagleS is offline
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Re: air/fuel mixture screw - sportster

thanks a job for tomorrow
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  #4  
Old 26-09-2008, 02:03 AM
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Hawgste Hawgste is offline
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Re: air/fuel mixture screw - sportster

Suggest you start at 1and 1/2 out,Then a 1/4 turn either way depending on which way you need to go
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  #5  
Old 26-09-2008, 08:48 AM
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Re: air/fuel mixture screw - sportster

thats a good starting point. I need a larger one really but ended up nearly 4 turns out. Still it runs sweet so if it aint broke.
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  #6  
Old 26-09-2008, 04:29 PM
BlackEagleS BlackEagleS is offline
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Re: air/fuel mixture screw - sportster

urrell sent me a paper that discusses the carb setting and it suggests that over 3 turns out may mean the screw spring has insufficient tension and the screw may vibrate out. may need to be checked occasionally.
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  #7  
Old 26-09-2008, 04:57 PM
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Re: air/fuel mixture screw - sportster

I have heard this but the thread is so tight due to a little corrosion I doubt it.
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  #8  
Old 28-09-2008, 03:53 PM
BlackEagleS BlackEagleS is offline
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Re: air/fuel mixture screw - sportster

fiddled about with it - thank god i fitted an ezjust (i know hog, it was not that easy) but at least i can adjust it and see how much i am turning it. dropped the revs, started at about 2, still quite difficult to measure ( i will have to take up the suggestion of a 45 jet at some point) 11/2 turns revs drop slightly but the other way and i can go to about 41/2 with little difference in the revs so anyway its now 21/4 out and seems the plugs are a reasonable grey/black but occasionally backfires via carb when i 'blip' the throttle at the lights/junctions - dont know if that means it too weak or too rich -but otherwise seems fine.
just a matter of checking the mpg later next week.
now all i have to do is come to terms with using almost a pint of oil every 500 ish miles and all will be fine (see other thread)
and the suns still out so im going out, occasional backfire and all.

Last edited by BlackEagleS; 28-09-2008 at 03:56 PM.
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  #9  
Old 06-10-2008, 10:37 PM
b0nio b0nio is offline
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Re: air/fuel mixture screw - sportster

BlackEagles, where did you get your ezjust? Or anyone else know how to do it without burning their fingers?
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  #10  
Old 06-10-2008, 10:48 PM
Rodders
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Re: air/fuel mixture screw - sportster

I only burnt mine the once. Use a small socket set and screwdriver bit. Wear a glove or lay something heatproof over the exhaust.
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