On a c70 just the added volume of oil to fill the oil cooler would have some benefit . But it is a can of worms I see no need to open for me . Baby Huey
To: Honda-C70@yahoogroups.com
From: hotcomb@yahoo.com
Date: Mon, 18 Jun 2012 19:36:16 +0000
Subject: [Honda-C70] Re: Oil Cooler
Before you add the coil for cooling you should add the high volume oil pump. I added the 270% model to my 70 but I see now there is a 300% version out there too. The difference between the two pumps may be marketing ploy only as the prices are relatively the same. It's very easy to do and only requires an impact driver and a 2mm drill bit to install. Many make it way more difficult than it needs to be.
I understand the need vs. want but the only way the cooler could be bad is if ran too cool. There is an operating "range" for everything. Anytime you are over or under you risk premature failure.
--- In Honda-C70@yahoogroups.com, myron andrews <mvandrews13@...> wrote:
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> Using the correct W oil for the temp range you use the bike takes NO modification. The temp chart is in the manual section at the bottom of the page . 20w50 Valvoline has worked for my usage . I have had the head off twice with NO sign of carbon or coking . Next oil change I will need to decide between Valvoline 20W50 4T motor cycle oil ,& Shell 15W50 rottela diesel oil as the type I had a case of is no longer OK for wet clutches. Or I suppose I could get Honda oil . Decision decisions .Baby Huey
> To: Honda-C70@yahoogroups.com
> From: aboard_epsilon@...
> Date: Mon, 18 Jun 2012 06:14:36 -0700
> Subject: Re: [Honda-C70] RE: Oil Cooler
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> Yeah ..the oil when hot, also gets thinner ..
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> thinner oil means, that it gets past the rings more easily
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> thinner oil ..equals less wear protection
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> burns off.....cokes up your valves...
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> overheating of oil ruins its make-up
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> all rubber changes with many temperature extreams...cracks and fails ..valve seals fail.
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> An oil cooler will keep the engine at a more stable temperature ..help components and limit expanding and tightening up and galling .
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> BTW ...my posts seam to be taking sometimes over 24 hours to appear here
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> all the best...markj
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> ________________________________
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> From: Dallas Denny <aegis@...>
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> To: Honda-C70@yahoogroups.com
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> Sent: Monday, June 18, 2012 1:43 PM
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> Subject: [Honda-C70] RE: Oil Cooler
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> >Re: Oil Cooler?
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> >Posted by: "RICHARD RIPLEY" mailto:rlripley%40prodigy.net ip_95141_3
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> >Sun Jun 17, 2012 2:30 pm (PDT)
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> >Ok, why do you think you need an oil cooler?Â
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> >10s of millions of  C70s seem to be goin'  ok
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> >without one. My old Gunny said "If it ain't broke, don't fix it"
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> >What's your opinion, Mike?
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> >Richard
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> Air-cooled engines run hotter than water-cooled
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> engines, and so don't last as long. Motors run
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> hot when the bike is standing still or moving at
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> low speeds, especially on hot days. So yeah, it
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> is kinda broke, and why NOT fix it?
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> Lowering the oil temperature a bit would make for
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> longer engine life, so installation of a cooler
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> would ultimately be cost-efficient. (The new
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> Triumph Bonneville [I want one SO badly!] is
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> air-cooled, but with a stock oil-cooler, quite nifty).
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> In 1969 I bought a new CL70 (same engine as C70,
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> according to Wiki) for I think $430 and drove it
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> long distances daily at high speed (about 50
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> mph). It was my only transportation. I changed
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> the oil every 300 miles. Every 10,000 miles or so
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> the engine would lose compression and I would
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> rebuild the top end. It cost only about $30 back
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> then, and took only about an hour, since I didn't
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> have to remove the engine from the frame, but at
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> 43,000 miles the connecting rod broke and came
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> through the engine case. My Honda dealer told me
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> I could get a new engine for $200, but that was
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> all the money in the world back then, and that was the end of my CL70.
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> 43k is fabulous longevity for a 70cc bike, but
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> I'll bet if I had had an oil cooler I would have
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> gone the entire 43k without a rebuild-- and who
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> knows, maybe the rod wouldn't have broken.
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> When Honda introduced the CX500 and Gold Wings
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> with water cooling, shaft drives, and tubeless
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> tires, motorcycles became a lot more reliable,
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> going to and even beyond 100k without any engine
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> work. I don't expect my CL70 to reach that level
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> of reliability, but with the oil 20 or 40 degrees
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> F cooler, I would feel I was treating my engine more kindly.
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> My first bike was a 1967 Honda C100, the 50cc
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> Cub, which was a fabulous bike-- so I understand
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> why everyone on this group loves their C70s.
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> Dallas
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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
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