Very Good directions. It started first kick and was very easy to tune
Thanks
--- In Honda-C70@yahoogroups.com, Mike Gladu <mgladu@...> wrote:
>
> At 3:23 AM +0000 7/19/11, GregH wrote:
> >I just put a new carb on a c70 I'm fixing for a neighbor and I'm
> >wondering what to set the different screws to ?
> >Thanks in advance Greg
>
> http://autos.groups.yahoo.com/group/Honda-C70/files/C70%2080-81%20Passport%20Shop%20Manual%20%28JPEG%29/042.jpg
>
> The one to the left (with the little flag on the head) is the pilot
> (air) screw, and on the right (center) is the throttle stop (idle)
> screw.
>
> Make sure there is some free play at the throttle grip first. With
> the idle screw backed out counterclockwise (CCW) until there is no
> resistance, make sure the throttle grip will turn about 1/8 to 1/4
> inch without resistance. That's the slack in the cable you need for
> the throttle slide to fall freely against the throttle stop screw
> (which allow the bike to return to idle easily). Adjust at the
> handlebar and of the cable if needed.
>
> http://autos.groups.yahoo.com/group/Honda-C70/files/C70%2080-81%20Passport%20Shop%20Manual%20%28JPEG%29/050.jpg
>
> Turn the pilot screw all the way in clockwise (CW) GENTLY until it
> stops. Turn it back out counterclockwise (CCW) 2 (1980) or 2-1/2
> (1981-1983) times. This is a good starting point, but you will be
> setting it precisely later.
>
> Shift into neutral, turn the ignition, fuel and choke ON - then start
> and warm the engine up.
>
> Once warm, turn off the choke.
>
> Set the throttle stop screw to mimic holding the throttle open a
> little (1800-2000rpm). This is to raise the throttle slide a little
> and engage both the main and idle jets for fine adjustment of the
> carb.
>
> With the idle fast and the choke off, you turn the pilot screw in and
> out until you make the engine run at the highest rpm for the throttle
> stop screw setting.
>
> Once you find the fastest idle setting by pilot screw tweaking, you
> can dial the throttle stop screw out CCW until you reach a nice, slow
> idle speed. You can do it by feel and hearing. No need for a
> tachometer
>
> Rule of thumb #1: You can never adjust the pilot or idle screw too
> much. Check it often. Set the idle high, adjust the pilot for fastest
> rpm and set the idle back down. No Big Deal. As a matter of fact, the
> pilot screw affecting the idle is a good sign of a clean slow jet in
> the carb - probably the most common carb problem of all. Tickle it
> every now and then just for good measure.
>
> Rule of thumb #2: There is no such thing as too slow an idle. Go as
> low as you can as long as the bike stays running and doesn't stall.
> Adjust for the weather if necessary (cold weather might require a
> bump up, hot a bump down). Slow is quiet, slow is good.
>
> Rule of thumb #3: If the bike pulls forward in 1st gear without
> turning up the throttle - the problem is not with your clutch. Your
> idle is too high. Turn it down.
>
> There you go.
>
> 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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