I hope that that was the entire problem. Rosy days ahead.
--- In Honda-C70@yahoogroups.com, Charles Schlosshan <cayman2653@...> wrote:
>
> Ron,
> After I replied to your message I went out to look at the points even though they were fairly new. Found the upper contact pitted and the points not matching together square. Set off trying to file them, just as well have tried to saw the legs even on a four legged stool. Anyway,gave up and ordered a new set of points and condenser from Beatrice Cycle. I'll post a message later this week or first of next week after they come in and let you know how it runs. That could have been the problem all along. It's hard to see the upper contact from the garage floor.
>
> From: rdwnj <rdwnj@...>
> To: Honda-C70@yahoogroups.com
> Sent: Wednesday, July 27, 2011 9:30 AM
> Subject: [Honda-C70] Re: Top Speed Issue
>
>
> Â
>
> Hello Charles
>
> You never mentioned the centrifugal advance mechanism? Is it working at all? Is it turning freely? Is it sticking? There is a nice chart in the C70 shop manual, page 70 -71. See my site for example,
> http://lostabout.com/c70_65_50_manual/
>
> Have you gapped your spark plug? Is it new?
>
> And usually you set the points gap down to 0.012" as you had it originally for more 'closed time'. You are making less time to charge with a wider gap! The condenser discharges 'instantly' as the points open, otherwise you would get a nasty spark across the points! Disconnect it and see :)
>
> Are you adjusting the points timing after adjusting the gap? They do affect each other, you know?
>
> Have you adjusted your valve tappets?
>
> Have you done a compression check?
>
> Ron in NJ
>
> --- In Honda-C70@yahoogroups.com, Charles Schlosshan <cayman2653@> wrote:
> >
> > A, Thanks for your suggestions and I will try and answer them.ÂÂ
> > - Tire pressure is 35psi
> > - Oil is 10W-40 motorcycle oil and the oil pump is operating.
> > - Brakes and chain are correct. Chain and sprokets are new. Gas is fresh this week.
> > - Carb is new and jets have been checked and cleaned. Air filter has been blown out and looks fine. A new filter should be here this week.
> > - Tuning has been done over and over. Ignition timing is advanced a little just because the bike runs better that way. Carb is perfect, no bogging at all.
> > - Cam timing is on the marks.
> > - Smooth level road, there are a few here, is where I can get 35-37mph. I usually set upright as do most scooter riders here. I come from the sport bike crowd so lying down on the bike is possible. CBR1000RR. One member suggested setting the point gap at the upper end of the adjustment span (.018mm) and give the condenser more time to recharge. I did this, was .012mm, and gained the additional 2mph I didn't get before.
> > - Throttle cable has a little more play then 5mm; visual inspection shows the slide completely opening the carb throat. I will adjust it when my parts arrive.
> > - Clutch is new and does not slip. The bike will almost do a wheelie when shifting to 2nd gear with the revs up.
> > - Since the previous owner apparently never changed the oil I don't think it has had any slippery crap in it.
> > ÂÂ
> > I and running out of things to check/replace/repair so any suggestion would be appreciated. I tried to check the muffler for flow just using my hand. Hardley anything comes out the end at idle and not much more rev'ed up a little. The muffler was rusted anyway so I ordered a new one from Beatrice Cycle along with a new cylinder head. I think one of my valves may have been leaking a little. I could detect a little puff sound around the head that I would have called a burnt valve if it was a car. Anyway that is the last item I can replace on the upper end. The engine feels like it is trying to rev on up in third gear, sorta like a surge for a second or so. (?) I would think that would be the ignition timing but I have moved it everywhere possible to move it. A little advanced is where it runs the best. With the timing set on the F mark it runs really sluggish. Any Comments?
> >
> > From: A <ak6666666@>
> > To: Honda-C70@yahoogroups.com
> > Sent: Tuesday, July 26, 2011 4:39 AM
> > Subject: [Honda-C70] Re: Top Speed Issue
> >
> >
> > ÂÂ
> >
> > Two more thing came to mind.
> > Throttle should not have more than 5mm play at grip flange.
> > Clutch should fully engage and not slip. At no point in the past should the bike have been subjected to EC slippery oils.
> >
> > --- In Honda-C70@yahoogroups.com, "A" <ak6666666@> wrote:
> > >
> > > I want to add that fresh air should hit engine to keep it cool.
> > >
> > > --- In Honda-C70@yahoogroups.com, "A" <ak6666666@> wrote:
> > > >
> > > > My two cents:
> > > >
> > > > Full tire pressure.
> > > > Not thick engine oil. Functioning oil pump.
> > > > Brakes and chain adjusted and proper sprockets.
> > > > Good petrol.
> > > > Clean air filter and carb.
> > > > Good tuning.
> > > > Smooth level road.
> > > > No head wind.
> > > > Tight sitting posture.
> > > > Removing anything which adds air drag.
> > > >
> > > > These should increase speed.
> > > >
> > > >
> > > > --- In Honda-C70@yahoogroups.com, "cayman2653" <cayman2653@> wrote:
> > > > >
> > > > > I am about to loose my mind trying to solve this problem and need some help. My bike has a new piston, rings, cylinder, carb, clutch, cam chain and most tensioner parts and it runs good at low speed. The carb is adjusted so there is no bogging at all and the idle is very slow and smooth. The cam timing is right, the ignition timing is slightly advanced ( it seems to run better like this )from the F mark and the point gap is correct. The valve clearance is set at 0.002in per the manuel. The bike feels like it has power in first and second gears and will accellerate to the shift marks on the speedometer. In third gear it runs right up to 32-35 mph and will go no higher. I have played with the timing until I am blue in the face and nothing seems to make much difference in the performance. When the new carb was installed I removed the fuel tank and cleaned it out good, replaced the fuel lines and adjusted the carb. Rechecked the carb for main
> > jet size yesterday. I could not find any numbers on the jet so I installed the stock Honda carbs main jet. This did seem to make the power level feel stronger but did not help the top speed any. Also checked the slide to confirm it does open all the way and the needle is set in the middle slot. Float level was checked and found to be about 1/8" low; reset to Honda spec's. Does anyone have a guess what could be the problem?
> > > > >
> > > >
> > >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
>
> [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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