[Honda-C70] Re: carb re dial

 

I learned this very useful procedure by closely watching a mechanic and listening to engine sound.

--- In Honda-C70@yahoogroups.com, "A" <ak6666666@...> wrote:
>
> yes i read them too and Mike has given very good directions.
>
> --- In Honda-C70@yahoogroups.com, "GregH" <youcanfindgreg@> wrote:
> >
> > 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.
> > > -
> > >
> >
>

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C70 Passport Not Running Right?
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

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