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Guaire
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Arlington, VA
Joined: 08/16/2016
Posts: 33

Yesterday I took a ride. It was 81 degrees, in a fair amount of urban riding. That's stop lights. My idle went up to 2000 rpm. I revved it and let it settle down. Eventually, it didn't want to settle down. Why would my '83 R80RT do that in the heat?

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1983 R80RT, 2014 Royal Enfield Continental GT, 1986 Honda VF500F

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6622
A couple of reasons. Have

A couple of reasons. Have you recently worked no the carbs? Made any adjustments? Carb adjustments should only be made after they've been warmed up after a 20-30 minute ride. If not, then, when they do get warm up, they will act differently for the settings made while cold.

You could have a sticking advance mechanism. This is an '83 so the mechanism is in a small container at the front of the engine. Somewhat fiddly to get in there, but I think people have found a small opening and tried spraying carb cleaner.

Another reason could be leaks in the black rubber tubes that connect the carb to the head. Try idling the engine and spray carb cleaner around these connections...if the idle speed changes as a result, you have a leak.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

Guaire
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Arlington, VA
Joined: 08/16/2016
Posts: 33
Spraying

"Another reason could be leaks in the black rubber tubes that connect the carb to the head. Try idling the engine and spray carb cleaner around these connections...if the idle speed changes as a result, you have a leak."

Good idea. Those boots are old. I haven't done adjustments on them. I think the tubes should be replaced.

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1983 R80RT, 2014 Royal Enfield Continental GT, 1986 Honda VF500F

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