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Old 04-07-2014, 07:09 PM   #1
beezerjoe OP
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Location: Salinas,California
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1977 R100RS overheating.

My '77 RS came down with a serious overheating problem the other night. Got out on the highway ran it up about75 or 80 where it likes to run. Got about two miles and I notice both pipes are cherry red all the way past the balance tube. Figuring it leaned out I put both taps on reserve, no change. I back out of it and get on to a city street pipes cease being cherry red. Ride the rest of the way home at 35 and opened The throttles back up on a long stretch and found that at speeds over 45 or 50 the pipes start glowing again. The bike has a Dyna ignition Bing carbs that get I sync every so often. Cleaned the carbs once and never messed with the jetting. I cleaned tried to clean some surface rust out of the tank a few years ago and it took forever to get the fine rust out of it as plugged filters for a while. I haven't got into it to diagnose the problem but I'm suspecting fuel starvation from the tank or badly retarded timing. I having a hard time buying that both carbs are plugged at the same time. I was just curious to see if anyone else ever ran into a problem like this and what they found was the cause. I'm fishing for suggestions. Thanks Joe.
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Old 04-07-2014, 08:23 PM   #2
lucky6600
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If exhaust got blocked for some reason, this might happen.



Have you checked the exhaust flow?
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Old 04-07-2014, 08:33 PM   #3
Kai Ju
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Check your timing. At idle and fully advanced.
Both mufflers clogging at the same time is unlikely. The Dyna failing or the base plate slipping on the other hand is a much more likely scenario.

Kai Ju screwed with this post 04-07-2014 at 08:39 PM
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Old 04-07-2014, 08:47 PM   #4
supershaft
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My first guess is that the chokes are stuck on. Rich makes pipes do that, not lean.
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Old 04-07-2014, 08:57 PM   #5
Wirespokes
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Quote:
Originally Posted by supershaft View Post
My first guess is that the chokes are stuck on. Rich makes pipes do that, not lean.
This makes the most sense to me too.
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Old 04-08-2014, 12:21 PM   #6
beezerjoe OP
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Thank you all. The choke appear to be close at least as far as the linkage is concerned. That doesn't mean there isn't any leak past the valves. I'll check the timing before I get too heavy into the carbs. Thanks for all the advice. I'll let you know what happens.
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