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General Category >> Rubber Side Down! >> What's your ideal air-fuel mixture?
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Message started by cl492 on 04/04/16 at 10:36:10

Title: What's your ideal air-fuel mixture?
Post by cl492 on 04/04/16 at 10:36:10

How many times do you turn that screw out?

Title: Re: What's your ideal air-fuel mixture?
Post by cl492 on 04/04/16 at 10:55:23

I usually hear 2.5-3 turns out.

Title: Re: What's your ideal air-fuel mixture?
Post by chzeckmate on 04/04/16 at 11:03:07

Lots of factors at play. Fuel, elevation, jets, intake, exhaust, ambient temperature, and humidity are all involved. You should set it according to your specific set of circumstances. Here's a simple video guide the guys around here recommend whenever this question comes up https://youtu.be/YxpQjDQzX7g

Title: Re: What's your ideal air-fuel mixture?
Post by verslagen1 on 04/04/16 at 11:24:17

start at 1 and a half turns and adjust from there.
any more than 3 turns out you're in danger of loosing the screw.

Title: Re: What's your ideal air-fuel mixture?
Post by Dave on 04/04/16 at 11:34:38

4748101D16240 wrote:

I usually hear 2.5-3 turns out.

Adjustments to your fuel/air ratio is not a universal setting - it must be adjusted by ear or meter. What works on one bike does not necessarily work on another bike. Elevation, float level, amount of ethanol in the fuel, humidity & temperature, type of air cleaner, etc. can all affect the setting.

As Verslagen indicated you can start at 1-1/2 turns out - which is in the middle of the adjustment range (At 3 turns out the screw is backed out to the maximum flow and additional turns out will have no affect. I have posted 2 videos below that show how you "listen" to find the point at which your engine runs smoothest - which is the point you are trying to find. You need to slow the engine idle speed down a bit to make this adjustment - as it is impossible to hear the change when the engine idle speed is up and the main/needle jet is supplying fuel to the engine. Your bike MUST be fully warmed up to do this adjustement - setting the mixture with a cold engine will get you a setting that is too rich for a warm engine.

https://www.youtube.com/watch?v=YxpQjDQzX7g

https://www.youtube.com/watch?v=zm5mB3R8Ucw

If you can turn the idle mixture screw all the way in and the engine still runs - your pilot jet is too big. If you have to turn the screw out more than 2.5 turns - the pilot jet is too small.

Title: Re: What's your ideal air-fuel mixture?
Post by justin_o_guy2 on 04/05/16 at 09:20:03

Be gentle with it. That's a fine point. When you screw it in to find the start spot, stop twisting as soon as you feel it touch.