Thanks a lot.
So screwing in makes fuel leaner, out, richer. Got it. Thanks.
--- In Honda-C70@yahoogroups.com, Mike Gladu <mgladu@...> wrote:
>
> At 5:26 AM +0000 7/27/11, A wrote:
> >I don't know what happens when we screw in the mixture screw. Does
> >it increase the gas or air content? Makes it richer or leaner?
>
> The pilot screw on a Keihin side-draft carb changes the amount of air
> that passes through the internal carb passages to mix with fuel in
> the "slow" circuit.
>
> The result may be counter-intuitive to some, but bear with me while I explain.
>
> The pilot circuit in the carb is there to make the idle and
> low-to-mid throttle opening mixture (air and fuel) fine-tuneable
> beyond what you get with just a fixed jet size and the throttle stop
> (idle) screw setting.
>
> By turning the screw 'in' (clockwise), you decrease the amount of air
> in the pilot passages which makes the mixture leaner.
>
> The opposite is true when adjusting the pilot screw 'out' (CCW).
>
> The adjustment has to be done with the throttle slide slightly raised
> (idle elevated) in order to balance the extra fuel and air delivery
> across the transition between idle (slide closed) and open throttle.
>
> Mike G.
> -
>
1970-73 C70 Honda Service Manual: http://tinyurl.com/6ebwtw
1970-73 C70 Troubleshooting Guide:
http://tinyurl.com/6ebwtw (scroll to sec.7.1 page 101.jpg)
1980-83 C70 Honda Service Manual: http://tinyurl.com/hu42c
1980-81 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec.18-1 page 170.jpg)
1982-83 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec. 20-28 page 205.jpg)
1980-81 C70 Maintenance Schedule: http://tinyurl.com/z4zn6
1982-83 C70 Maintenance Schedule: http://tinyurl.com/hw35c
More resources for C70 Passports and Cubs:
http://www.shlaes.com/Vehicles/Scooter.htm
http://www.velodrome.com/HondaC70/HondaC70.html
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