Wow, it's really hard to find engine parts for an '83. I kind find the right piston anywhere other than honda dealers
--- In Honda-C70@yahoogroups.com, william belleau <wjbelleau@...> wrote:
>
> I am afraid you have the wrong parts for your engine.
> I thought www.Dratv.com had a note section talking about the different
> engines. The part about 12V vs 6V has to do with the design of the engines
> used in the C70. Some have a short conecting rod and some have a longer rod.
> The cylinder, head and piston all have to match your engine. A dome piston
> into an engine that originally had a flat piston means the piston is hitting the
> cylinder head.
> Sounds like you need to start over. Sorry
> Bill
> Portland OR
>
> --- On Mon, 6/6/11, Jill <jillvee@...> wrote:
>
>
> From: Jill <jillvee@...>
> Subject: [Honda-C70] Re: piston hiting on valve's
> To: Honda-C70@yahoogroups.com
> Date: Monday, June 6, 2011, 12:50 PM
>
>
> Â
>
>
>
> Well, I compared both pistons and the first one is really flat while my new one is domed.
>
> --- In Honda-C70@yahoogroups.com, myron andrews <mvandrews13@> wrote:
> >
> >
> > Mike : Correct me if I am wrong but could Jill determine if the piston is hitting a valve or the head by checking tappet clearance on both valves? The valves should be closed with the piston up & tappets would be open. That might indicate if the cam chain is on the wrong tooth of the crank shaft or if the piston [if it is not the original ] is too tall & hits the head. Baby Huey
> >
> >
> >
> > To: Honda-C70@yahoogroups.com
> > From: mgladu@
> > Date: Mon, 6 Jun 2011 12:33:29 -0500
> > Subject: Re: [Honda-C70] piston hiting on valve's
> >
> >
> >
> >
> >
> >
> > At 5:16 PM +0000 6/6/11, Jill wrote:
> > >I got my timing all set up and stuff after swapping cylinders, but
> > >now the piston is hitting on the valve's. I can't even get close to
> > >being able to turn it all the way over. I swear i have all the
> > >gaskets and stuff. Any ideas on what to do next?
> >
> > You must have either the crank or the cam in the wrong place when
> > setting the cam chain on the cam sprocket.
> >
> > TDC happens twice, once is 'false' (180 degrees off), the other is
> > 'true' (zero or 360 degrees).
> >
> > I'm guessing you used the wrong mark on the flywheel ("T" mark is
> > correct) or indexed it to the wrong place on the case.
> >
> > http://autos.groups.yahoo.com/group/Honda-C70/files/C70%2080-81%20Passport%20Shop%20Manual%20%28JPEG%29/185.jpg
> >
> > It could also be that the wrong place on the head was used for the
> > cam sprocket (something other than 9 o'clock), but that's less likely.
> >
> > http://autos.groups.yahoo.com/group/Honda-C70/files/C70%2080-81%20Passport%20Shop%20Manual%20%28JPEG%29/188.jpg
> >
> > Only thing left would be if you used a 6 volt head or cylinder in the
> > rebuild. If so, the higher-domed 12 volt piston could be hitting the
> > HEAD - not the valves.
> >
> > Mike G.
> > -
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
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> [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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