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General Category >> Rubber Side Down! >> Idle mixture screw
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Message started by sidny4 on 09/22/08 at 14:39:59

Title: Idle mixture screw
Post by sidny4 on 09/22/08 at 14:39:59

How does the idle mixture screw work? More specifically, is it turning it in that leans it out, or turning it out that leans it out? When adjusting it, I get about 1.75-2 turns out before the engine starts slowing down but when all the way in it is still idling strong, no change. Any ideas as to what to change? I have the 55 pilot and 152.5 main jets from Lancer in. No white spacer mod yet.

Also, can the screw be replaced? I damaged it a little when I was drilling out the plug.

Title: Re: Idle mixture screw
Post by YonuhAdisi on 09/22/08 at 14:41:48

Turning it out richens it.

Screw can be replaced, it costs between 2 and 4 bucks.

Title: Re: Idle mixture screw
Post by serowbot on 09/22/08 at 15:50:51

Yep,...what he said....

There's a spring behind it, so watch out...

Title: Re: Idle mixture screw
Post by verslagen1 on 09/22/08 at 17:02:58

think of a faucet, same thing

Title: Re: Idle mixture screw
Post by T Mack 1 on 09/23/08 at 09:54:56

In theory, when adjusting the idle mixture screw, you should be able to get the idle to drop on both the rich side and the lean side. If you can't, then the jet may need to be replaced.

If you can't get it to drop on the rich side, you need a bigger jet. If you can't get it to drop on the lean side, smaller jet. BUT>>>>>>> the sprkplug color should be checked after running on the adjusted setting.

On mine, the 55 was too big. I could bottom out the screw and the idle didn't drop. With the stock jet (52.5), I'm real close to 3 turns out. ( I could use a 53 or 54 jet)

My bike: stock air box & filter, White spacer mod, Dyns Screaming Eagle turn-out (clone, w/ baffle added), elevation approx 500 ft above sea level. 152.5 main.