RE: [Honda-C70] After market carb

I am not sure but 35 mph probably is high speed as far as being on the main jet rather than slide needle controlling fuel out of the main jet for mid range. Have you ever done a spark plug color check for high speed mixture ? New plug ,run it up to high speed ,hold the shifter to declutch & hit the kill switch . Coast to a stop ,check plug color. I have never tried it for high speed so I don`t know if you just get up to speed or need to cruse a bit before chopping throttle. Make sure you don`t have a resistor plug cap & a resistor plug. My plug cap went bad last year . Early symptoms were harder to start & acted like the carb wasn`t right. Yes I blamed the carb like everyone does. The Honda mechanic I finally took it to replaced the plug cap cleaned the points & it started 2nd kick. $50 labor $3 for the cap. So a plug cap is cheaper than a new plug if you skip the mechanic. Also have you ever done a cam chain tension adjustment ? It is supposed to self adjust when you loosen the pinch bolt on the lower side of the left cover directly opposite the cap that covers the tensioner rod . It is done with the motor running . I can`t think of any thing else right now . Good Luck! Baby Huey PS I am retired so most folks would call me an old fart rather than a young buck.

To: Honda-C70@yahoogroups.com
From: cayman2653@yahoo.com
Date: Tue, 4 Oct 2011 05:23:02 -0700
Subject: Re: [Honda-C70] After market carb


Myron,
Thanks for your reply. I had the points gapped wide when I replaced them during the overhaul but they may have worn down some since then. I will check and regap. My memory is not as good as you young bucks, the front sproket is 14 tooth and not 15. The bike would barely run at low speed and would miss badly at wide open throttle on the Honda carb, after two cleanings. I pulled the slow jet out and it was corroded up really bad and I was not able to clean it. The main jet was clear. With the dratv carb the bike idles very good, accellerates smoothly and only faults at high (?) speed; above 33-35 mph on this bike. I no longer thing it is the bike just doing all it can do because it sounds like an ignition issue or just running out of fuel in the bowl. Hence the question what to set the after market float level at? The cam is timed as best I can set it. It never exactly lines up with the mark on the head, seems to be a little off but not
a whole tooth. I have tried moving it one tooth each direction but it ran worse either way. The timing is set slightly past the F mark because it seems to run better there. I don't have anyway to check the spark advance but it seems to work easily by hand. Do you have any other suggestions?

________________________________
From: myron andrews <mvandrews13@hotmail.com>
To: honda-c70@yahoogroups.com
Sent: Monday, October 3, 2011 7:58 PM
Subject: RE: [Honda-C70] After market carb

Cayman : Did you set the points air gap on the wide side of the spec ? My 81 loses top speed & acts as you describe around 35 when the gap wears slowly closed. Did you ever get a 14t front sprocket & get rid of the 15t overdrive you keep saying is stock ? 14-36 is stock 15-36 is overdrive . I hope you are not blaming the carb for something else that is not right . If the old carb didn`t work right & the new one doesn`t either doesn`t it make sense that it is NOT the carb. Good Luck ! Baby Huey

To: Honda-C70@yahoogroups.com
From: cayman2653@yahoo.com
Date: Mon, 3 Oct 2011 11:59:27 +0000
Subject: [Honda-C70] After market carb

Earlier this summer I replaced the Honda Carb on my 81 Passport with a after market carb from dratv. It runs good but is not completely right. The bike runs right up to 33-35 mph and seems to studder (?), like its running out of gas or out of time maybe. There are lots of instructions on how to set up a Honda carb on this site and they work very well. But I don't think the settings are the same for the dratv carb. Does anyone know what groove the needle should be set in? What should the main jet size be? The bike idles very smooth and slow; it will rev right up in first and second gear but seems to run out of power in third gear. Gearing is stock, 15-36, and the engine has about 200 miles on a upper end rebuild.

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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

More resources for C70 Passports and Cubs:
http://www.shlaes.com/Vehicles/Scooter.htm
http://www.velodrome.com/HondaC70/HondaC70.htmlYahoo! Groups Links

[Non-text portions of this message have been removed]


[Non-text portions of this message have been removed]

------------------------------------

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

More resources for C70 Passports and Cubs:
http://www.shlaes.com/Vehicles/Scooter.htm
http://www.velodrome.com/HondaC70/HondaC70.htmlYahoo! Groups Links

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