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Old 07-01-2013, 09:24 AM   #1
Olliew72 OP
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Location: Portland, OR
Oddometer: 34
Overheated, now it wont run.

Hey all,

This is all pertaining to my 71 R75/5.

So Portland hit 90+ on Friday. I had to ride home in bumper to bumper traffic for 2 hours. It was brutal. I tried turning off the bike whenever it looked like I'd be in the same spot for a while. However, about 1.5 hours in, it died at a stop.

I let it sit in the shade for 15 minutes and then I was able to get it to start. I made it a few more miles. Then it died again and I did the same thing. I got the bike home.

Over the weekend, I rechecked the head bolt torques, and reset the valves just in case. I run Redline synthetic oil and it doesn't smell burnt and looks fine.

Then, I tried to start it up this morning and it, but it just cranks over. It almost caught once, but that was it. I'm wondering if I fried the points or condenser?

Thanks for any thoughts,
Chris
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Old 07-01-2013, 09:54 AM   #2
Mista Vern
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I'd sure check for spark. Pull the plugs, hook them back up to the plug wires, lay them on the cylinders and turn the bike over and you should be able to see them sparking or not. Good luck!
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Old 07-01-2013, 10:10 AM   #3
England-Kev
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condenser or coil, or both. change the condenser first, as it is cheapest
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Old 07-01-2013, 10:46 AM   #4
Olliew72 OP
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Got it, thanks! I'll let you all know what I find.
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Old 07-01-2013, 10:58 AM   #5
Beater
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I'll bet the coils are cooked. Are they original coils?

Either way, check for spark. I'll bet it's either non-existent or a weak orange color.
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Old 07-01-2013, 01:09 PM   #6
Olliew72 OP
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Yeah, they're the original bosch 6 volt coils. You might be right. I'm hoping it's the points or condenser as I have a set of those spare. Otherwise, they'll be no riding for a week.
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Old 07-01-2013, 04:33 PM   #7
PaulRS
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Points, no, they don't react to heat.
Condersor, possible, but an easy swap.

My money would be on the coils, overheat and they are done for.
If they are the original coils, they are 40-ish years old, might put them in retirement and fit some new.

Paul.
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Old 07-01-2013, 05:35 PM   #8
kbasa
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Hey Ollie, How about posting airhead topics in the actual AIRHEADS forum we built for that purpose?

Thanks.

Please read the rules and stickies in this forum before posting further.

Thanks.

Kbasa
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Old 07-01-2013, 07:44 PM   #9
Kai Ju
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any possibility you might be out of gas ?

Kai Ju screwed with this post 07-01-2013 at 09:58 PM
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Old 07-01-2013, 08:05 PM   #10
Bill Harris
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May be coils, may be condenser. How did the plugs look?

It takes a lot to kill these engines. One inmate's brother let his airhead idle for 45 minutes to charge up the battery on a riding lawn mower (or something inane) and that bike was repairable. I recall there were "other issues" not related to the overheating that gave him fits.

Like they said, check for spark, check for fuel.

--Bill
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Old 07-01-2013, 08:47 PM   #11
Olliew72 OP
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Quote:
Originally Posted by kbasa View Post
Hey Ollie, How about posting airhead topics in the actual AIRHEADS forum we built for that purpose?

Thanks.

Please read the rules and stickies in this forum before posting further.

Thanks.

Kbasa
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I'm confused, my browser trail shows that I am posting in the Airhead forum???

Anyways, I found the problem. The condenser got really hot and melted through the wire to the points. I replaced them both, gapped the points and did the timing. Now, she purrs like a kitten, or maybe a typewriter.
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Old 07-01-2013, 09:46 PM   #12
Bill Harris
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KBasa prolly moved the original msg to Airheads. He has magickal powers.

Good news of the /5. They are like tractors.

--Bill
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Old 07-02-2013, 02:22 AM   #13
disston
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Quote:
Originally Posted by Olliew72 View Post
I'm confused, my browser trail shows that I am posting in the Airhead forum???
Notice post #8 right above in your thread. The Mod, Kbasa, moved your thread to Airheads. This is done so the Airhead people will see it. No idea where you originally posted this. If you read the "Rules" it will explain.
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Old 07-02-2013, 04:27 AM   #14
MaraBiker
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I had similar issue with my bike last weekend. Road a tour on the coast and the heat was unbearable. Couple of border crossings and he was toasted. It took whole night to cool off. I changed spark plugs and he run great.
So start with the spark plugs.
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