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Just finished a re-install of carbs that have been rebuilt. They have been twice checked on a test motor and are fine. Bike was still not smooth. Today I noticed the exhaust on right side was not warm. Started feeling the pipes moving toward the motor--pipes not warm at all. Left side is hot as normal. Evidently right side is not firing---has NEW coils. I am at a loss for ideas. Anybody else ever encounter this kind of issue??
 

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Since each coil fires a plug on each side it is not likely. Have you checked for spark? Are you certain of the plug wire position? If you spray carb cleaner into the carb throats in the plenum does it change?
 

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Hmm, it should be fairly NOTICEABLE if she's only running on two cylinders. Did you feel the exhaust all the way up to the head? While it's running, pull one of the right side spark plug wires off (don't get zapped) and see if the engine stumbles. If the engine's running attitude does not change when you unplug the spark plug, then that cylinder is probably not firing. FYI: whilst unplugging the wire, you ought to hear the spark jumping the gap from plug wire to spark plug. If you notice a change, but perhaps not a very big change, plug it back in and try a plug on the left side, notice the difference...
 

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First I would check for spark on those cylinders, put a known good plug into the caps and ground them to the crash bar. If you have spark check compression. If no spark check the wires and caps. Then check for 12V at the coils.
 

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I had a similar problem on an 1100 many years ago. 1100 miles from home my gas mileage went to about 10 mpg and the exhaust from one clyinder was ice cold. When I got to a Honda dealership they took the carbs apart and found that the seat in the jug with the cold exhauset had vibrates out and raw gas was running out like a water faucet. If I were in your place I would ride it and see if the mileage goes very bad.
 

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You gotta give the year model because it matters,,You said that you went through the carbs and cleaned them up, if it's a 80 model or 81 model the chances of you pulling the idle jets is very slim as they are pressed in but the 82, 83 are unscrewable and easy to check..Having a clogged idle jet will cause no fuel to get through thus no warm exhaust pipe at idle like the others,,,if the idle jets are clean and you are positive they are then I'd check the ohm's at the PG plugin, wires ect. it's fuel delivery I betcha...
 

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Cold Exhaust

Hello all, I have the same problem that namsgt1946 has but when I give it throttle my exhaust heats up fast. the bike pops a lot. could this just be a mixture problem that is taken care of with an adjustment?
 

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Increase the rpm's to 3000 do the cylinders pick up??= idle jet issues. if not move on.

Easiest test pull the filter and spray starter fluid at the 1/3 cylinders if she perks up you have a fuel issue if not an electrical issue..
 

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Hello all, I have the same problem that namsgt1946 has but when I give it throttle my exhaust heats up fast. the bike pops a lot. could this just be a mixture problem that is taken care of with an adjustment?
No, an adjustment will not fix it. The low speed jets are plugged.
 

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Your low speed/ idle jets are plugged. Yank the carburetors back off and remove and clean the jets. We need to know your year of bike. The 81 jets were pressed in but the 82 and 83 were screwed in.
 

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81 Idle jet removal

I saw a video somewhere that used a small easy out to remove the idle jets. The easy out does not go deep enough to damage the orifice. I used this technique on my 81 and it worked perfectly. Tap the easy out to set the reverse screw (threads cutters??) and turn the easy out until the jet pops loose. My easy out set is numbered 1 thru 5. I used the #1. If you were drilling a hole to use the #1 it would be a 5/64". That should give you an idea of the size.

You can then remove the jets and clean them using a size 9 (high E) guitar string. The string does not measure .009 like you would think, but it works great.

To reinstall them I used a piece of brass rod and tapped them into place.

Rayjoe

P.S. When I first read the thread title. I though it was about a good looking after market exhaust system. Cold might have been a better term.
 

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1+ on the plugged idle jets! I had to clean mine several times before I got them right. If yours is popping back through the carbs that is the sign of a very lean condition in 1 or more cylinders caused by plugged idle jets. Trust me when you think they are clean they may really not be. Took me four times before mine were right. Cured the popping, evened out the idle , huge difference.
 

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I could be mistaken but I know it's a wasted spark ignition and I thought that one pulse coil fired one side and one fired the other side. Firing order of 1324 means one side (1 and 3)fires first then the other side (2 and 4), because of this is it not true that each pulse coil is responsible for a side, (1-3) or (2-4) and if you have a bad pulse coil you could have a cold side as he describes.
I bring this up because he says that the carbs were run on another engine and worked
 

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My bike is a 1980 GL1100 Interstate. Carbs are out again. With the press in idle jets can they be cleaned without removing them? I am not super experienced in this area and dont want to ruin them. Thanks for the info.
 

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I could be mistaken but I know it's a wasted spark ignition and I thought that one pulse coil fired one side and one fired the other side. Firing order of 1324 means one side (1 and 3)fires first then the other side (2 and 4), because of this is it not true that each pulse coil is responsible for a side, (1-3) or (2-4) and if you have a bad pulse coil you could have a cold side as he describes.
I bring this up because he says that the carbs were run on another engine and worked
No, 1 coil fires the front cylinders and the other coil fires the rear.
 

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My bike is a 1980 GL1100 Interstate. Carbs are out again. With the press in idle jets can they be cleaned without removing them? I am not super experienced in this area and dont want to ruin them. Thanks for the info.
If you do a search there are hundreds of threads concerning this. I have tried many times and never have been able to clean those jets in the carb. I use a small drywall screw, run it in tight and pull the jet out with it. Others use a small easy out.
 
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