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Author: Subject: how do I adjust the fuel mix?
MemberKafer Lover
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posted on April 12th, 2003 at 02:30 PM
how do I adjust the fuel mix?


I have carbon coated spark plugs, which means I am running rich, correct?
I have a 34 pict 4 carby, how do I adjust the mix to correct this? I only have manuals for earlier carbies, I think I know which is the fuel mix screw (higher up than the earlier models on the side just below the auto choke?). But which way and how much do I turn it?
I guess I should replace the plugs too right?
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posted on April 12th, 2003 at 08:46 PM


In a word.....not really...
what was once a simple analysis now is complicated by the " Crap Fuel " available.
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One suggestion is to ensure the tank is completely (purely ) filled with Premium Unleaded and run this for some time before doing the Plug Cut. (checking the plug colour ).
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The problem is that Lead Replacement fuel leaves soot on the plugs now matter how lean it is.
Add to this the possiblity that you could be being fed a mixture ethanol with your fuel which means " I dont know what " for plug colour.




Regards,Glenn>
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posted on April 12th, 2003 at 08:50 PM


do a search for Rob (Aussie bugs site)

he has a wonderful site on tuning




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posted on April 12th, 2003 at 08:55 PM


OK, thanks,
I don't use LRP though, only unleaded and every now and then premium (when I'm feeling richer than usual:()

I may not have located the fuel mix screw correctly, any one be able to help me, which side of the carby, what is it near?
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posted on April 14th, 2003 at 12:04 AM


should be the one with the spring set it about 1 1/2 turns out from fully in then tweak it from there



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