That third screw is very useful for me.
After a rainy spell, water collects in my carb (for some strange reason). If I unscrew this screw, first that collected water drains out and then fuel starts coming. Then I tighten it and engine starts without a problem.
The second screw, air fuel mixture, is important at all speeds I think. Someone said that tighten it in fully, unscrew it 1.5 turns and that sets the correct mixture. With less air and more fuel, I guess there are greater chances of carbon monoxide forming.
--- In Honda-C70@yahoogroups.com, "rogueeve" <rogueeve@...> wrote:
>
>
> Ok, so there's 3 screws on the carb.
>
> The philips head screw which is located sort of in the middle is the "Pilot stop screw". It's used for adjusting the idle speed. It doesn't adjust the mixture or anything like that, all it does is hold the throttle open more or less when you're not otherwise touching it yourself. The more you turn it in (clockwise) the higher your idle will be.
>
> The flathead screw, which sometimes has an infuriating grey cap over it with a ridge which only lets you turn it so far for "emissions" reasons, is the idle air screw. It adjusts the mixture at idle. I think it's more air the further out (counter-clockwise) you turn it. I don't think it has much of an effect except at idle.
>
> And the last one is the philips head screw at the bottom, the drain screw. Turn that and all your gas will spill out all over the floor. Yippee :)
>
>
>
> --- In Honda-C70@yahoogroups.com, Liz <veap29@> wrote:
> >
> > Hello everyone.
> >
> > I just had the carb cleaned and it kept dying with the choke half open, closed and fully open.
> > So I read the manual and saw there are two screws I can adjust. So tonight I adjusted one of the screws, but not sure which? when I did turn the screw slowly clockwise the idling got higher....this is a good thing right? because now the bike doesn't die? I didn't go crazy with that screw, just a slight turn clockwise. So now the other screw, do I want to turn that one counterclockwise? I looked at the diagram, but can't tell which screw is which and at what position they should be in?
> > Thanks.
> > Liz
> >
> > Motivation is what gets you started. Habit is what keeps you going.
> >
> > [Non-text portions of this message have been removed]
> >
>
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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