Thanks a ton. I'll do the basic carb "tune" before I install a new one. My problem is that when the engine is cold I have trouble keeping it from stalling without giving it gas until it's warmed up (with choke on of course). I'll try this and see how it goes.
--- In Honda-C70@yahoogroups.com, Mike Gladu <mgladu@...> wrote:
>
> At 2:09 AM +0000 5/31/12, huskerwr38 wrote:
> >I have a 1980 Honda Passport C70 that needs some carburetor work
> >done. I have a new carb from dratv.com that I was thinking of just
> >installing instead of trying to fix the original one. Here's my
> >question, is installing the new one just as easy as clamping down
> >some tubes, draining the fuel, unbolting the old one, removing the
> >choke and throttle cables, and then bolting on the new one and
> >re-connecting everything?
> >
> >Will I need to "tune" (besides adjusting the idle screw) the new one
> >or should it just work out of the box?
> >
> >Thanks
>
> I'll be the bad guy.
>
> There is no such thing as a "no-tune" carb.
>
> You could pre-set the screws, clips and such to known-good starting
> points and be better off than you were with a clogged OEM carb - but
> there's a more than equal chance that you'll be no better off until
> you set the basic adjustments that match a new carb to your engine.
>
> The basic needle and screw adjustments set the mixture of air and
> fuel that makes the engine idle, and support the transition between
> idle and medium throttle.
>
> Without the adjustments, the engine might not idle smoothly, could
> bog, surge, or not run well at all at full throttle.
>
> Use this little post in the C70 FAQ:
> http://autos.groups.yahoo.com/group/Honda-C70/files/C70%20FAQ/
>
> ...for basic carb adjustments:
> http://autos.groups.yahoo.com/group/Honda-C70/files/C70%20FAQ/Carburetor%20Adjustment%20SIDE%20DRAFT%20%281980-on%29
>
> 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
