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Discussion Starter · #1 ·
I finally got my "83 to start, run, and idle...BUT... when I give it gas slowly, all is fine up to 2000 rpm, then as soon as I exceed 2000 rpm the motor will start to run poorly and backfire out the exhaust. It will also throw flame out the right side tailpipe. I have an idea what it is but I would like to hear from others on this.
 

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Just Winging It
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What have you done so far?
I finally got my "83 to start, run, and idle
Did you use the choke?

Is the fuel new? Or 5 years old?

Did you run till warm?

Have you changed the fuel filter lately?

Have you had the carbs off?

More info please. It should help to figure out what needs work.
 

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1985 GL1200 A
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I finally got my "83 to start, run, and idle...BUT... when I give it gas slowly, all is fine up to 2000 rpm, then as soon as I exceed 2000 rpm the motor will start to run poorly and backfire out the exhaust. It will also throw flame out the right side tailpipe. I have an idea what it is but I would like to hear from others on this.
What are you complaining about? Flames coming out of your exhaust is cool, right?:ROFL: I mean, most people have to PAINT flames on!

Reckon something is a bit rich or something else isn't burning fuel. Have those carbs been synchonized and the pilot screws set right? Confident all the floats are set right and the intake (needle) valves are doing they're job properly. The only good thing we've got going for us is that there are only SO many things that can be a problem, right?
 

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Besides all the possible carb problems there is another thing to check. Last year wehn i got my 83 out after the winter it did the same thing you are talking about. Now mind you I had completely gone through the carbs before putting it up and ran great, carbs were drained and clean before storing. Put my battery in and gas and she fired right up but backfired on one side like a cannon, never had that happen before. Well my battery was a few years old and kinda weak, checked the voltage after starting and it was way low and not coming back up, less than 10 volts and stator doesn't start raally charging till higher rpms on these. New battery, no backfire! These ignition systems don't work well below about 11 volts, a few misfires to load the muffler then fire and well pretty noisy and flame too possibly. before you tear into carbs and such check your battery voltage after start. Or you can hook up a jumper battery and see if that helps.
 

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Discussion Starter · #5 · (Edited)
Haven't done that much to the bike. Have confirmed that timing belts are properly timed and I have Sea Foam in the gas. New battery and starter solenoid have been installed.

Just ordered a synchronizer and valve cover gaskets. I'll see what that gets me then i'll post results.
 
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