Sounds to me like either you have some obstruction in the carb, or you just arent getting enough flow to fill the bowl fast enough. this a problem i have a lot on my 2 stroke hondas, it alsmost always ends up being a bad petcock or a partially clogged inlet or float needle/seat. do make sure that cap is cleaned though, there are 2 vent holes and my c70 was completely gunked shut when i first got it.
Good luck, I also just got my first 10k+ c70, and live in ks. the 110+ temps dont bother me as much as the 110+ degree winds that were trying to blow me off my bike last night.
--- In Honda-C70@yahoogroups.com, "benadolphson" <benadolphson@...> wrote:
>
> I changed the oil when I bought it afew months ago and the idle speed is good. I do live in KS where we are experiencing 100 degree weather...over heating would cause it to die??? should I run with the leg sheild off to get more air flow around the engine?
>
> --- In Honda-C70@yahoogroups.com, "Jean Luc Picard" <atari2600a@> wrote:
> >
> > Wait hold on have you checked the oil & the idle speed? Could be overheating, could have a low idle, couldn't hurt to check :P
> >
> > --- In Honda-C70@yahoogroups.com, "benadolphson" <benadolphson@> wrote:
> > >
> > > Thanks, This morning I cleaned the the fuel filter and there were some flakes in it. I also checked the spark plug and it is a little on the rich side but not to bad. I took it for a ride this morning out to my grandmas and it did the same thing....bogging down noise and died. I waited a few minutes and I was good to go. On the way home it ran perfectly no issues, so I dont know.
> > >
> > > --- In Honda-C70@yahoogroups.com, myron andrews <mvandrews13@> wrote:
> > > >
> > > >
> > > > The answer to" could the megaphone exhaust have something to do with the issues" is yes if it leans out the mixture at high speed . Racers need to tune the jets to match the exhaust/intake of the bike. Try a little choke at high speed to richen the mixture & see if that helps it run better. A spark plug color check might also help determine if you are rich,lean or just right. Black is rich ,brown [coffee with cream ] good ,white is lean. If your vent cap were plugged & causing a vacuum the bike would likely die in 2or3 miles of slow riding. Test by turning the petcock off ,go for a slow ride until it dies ,compare to your high speed cut out. I almost forgot a high speed miss or cut out can also mean your points air gap has worn closed over time & the coil is not getting enough dwell time to recharge for the next plug fire. Does a full gas tank over less than 1/2 make a difference? That points to fuel lines or the pipes out of the tank . Good Luck ! Baby Huey
> > > >
> > > >
> > > >
> > > >
> > > > To: Honda-C70@yahoogroups.com
> > > > From: benadolphson@
> > > > Date: Wed, 17 Aug 2011 04:06:44 +0000
> > > > Subject: [Honda-C70] Issues at high speed
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Hey everyone, I have a few questions for you. I have an '80 passport. I bought it a few months ago with over 10k on it. I'm quite pleased with it even though it's showing its age. As I've been replacing old parts and restoring it the best I can; I noticed that the previous owner cut the end of the exhaust pipe off were it starts to taper back down...So I'm left with a megaphone type exhaust. At high speeds my C70 sometimes cuts out....it sounds like I'm not getting enough fuel. After I let it sit and loosen the gas cap (just in case its not venting) it starts right back up. So I'm thinking that
> > > > 1. I have crud in my fuel lines or fuel filters,
> > > > 2. I'm draining the fuel bowel @ high speeds or
> > > > 3. My vent cap is not venting and I'm creating a vacuum in my fuel tank
> > > >
> > > > My question as I research this problem is, Does my megaphone exhaust have something to do with the issues I'm experiencing at high speeds? Granted I don't think that having crud in my fuel lines or a vent cap thats not venting are related, but this is my first step into the world of valved engines and I didn't know if the exhaust would cause to much flow through the engine. Thanks!
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > [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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