Thanks. I researched the group web sit on this. I am new so I might not know where to look. But I seem to get conflicting advice on the gasket between the head and the fange. Some say I just need the two piece gasket so I ordered them from Dr ATV yesterday. You have given me different advice. I just got the bike and it runs pretty well. I am afraid to drive it much with the exhaust open as it is for fear of damaging a value or the piston. I guess this might be too simple of a problem to bring to the group's attention but since I have to order the parts online I want to make sure I am ordering the correct parts so I fix the problem (and the vibration rattle!). Jeff PS This is a 1981 Passport with I believe a stock exhaust system.
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From: myron andrews <mvandrews13@hotmail.com>
To: honda-c70@yahoogroups.com
Sent: Tuesday, June 19, 2012 7:40 AM
Subject: RE: [Honda-C70] exhaust system
Jeff : I hope you are able to get the broken stud out . When I had a broken exhaust stud ,it would not drill out . So I had to remove the head & beg a machine shop to mill out the broken piece . The machine shop forman said he would "try" under 1 condition ,that we both agreed that the head was junk & had no value" as is "so that if his work went wrong he was not at fault. It worked & I now have an over size american thread cap screw with a nut replacing the exhaust stud . There are 2 types of exhaust gaskets . First is a crush gasket that sits in a groove in the head around the exhaust port . Like its name it is crushed by the end of the exhaust pipe to form a seal against the aluminum head. You are supposed to replace it with a new 1 when ever you loosen the pipe ,& it is thin metal & rots out in the heat & exhaust. The other is a solid copper gasket that fits in the groove in the head in place of the crush gasket & is permanent forming a copper
surface for the pipe to seal against instead of the softer aluminum head . If things don`t work out with replacing the broken stud ,you might want to consider DRATV `s ready to go head . It is supposed to be complete ready to bolt on . But like any ready to go you would need to check that every thing is tight & correct before bolting it on . I hope your luck is better than mine ,but my bike is still "alive " after head surgery. Baby Huey PS I did the head surgery before I knew about this group so it was cross my fingers & hope with no one to ask advice.To: Honda-C70@yahoogroups.com
From: wjbyers@rocketmail.com
Date: Mon, 18 Jun 2012 22:23:44 +0000
Subject: [Honda-C70] exhaust system
I am new to this group. I have a Passport (1981) and the exhaust assembly is loose from the cylinder head. One stud is broken off in the head. I will have to tap with out, I guess. I am wanting to know what parts (gaskets) belong between the head and the flange. Also, I imagine there are nuts for the studs that secure the fange. Would any one know the size of these nuts? I am wondering if, after tapping out the broken stud, I will be able to use a stock size stud (I believe I saw these offered from one of the online parts stores) and, again, what size the nuts would be. Also, does anyone have an opinion as to whether the Hayes c-50 c70 c90 book is worth the $36 dollar cost. Thanks, Jeff
[Non-text portions of this message have been removed]
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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]
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
