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Hi,first of all worm the car up to running tempriture,put your hand on the water pipe that is coming from the fermastate is it hot if so try the one at the bottom of the radiater to see if that is hot if that is hot then the radiater is fine,nexst turn engine off,then undo the oil cap to see if your oil has a musterd colour for oil if oil is ok,then you will have to do a compresion test to see if there is one of your cylinders has low compresion.
some times you can have a broken head gasket which can couse uneven running due to water going into the cylinder.
I hope its not bad and a easy fix this is just to give you food for thought,best of luck.
Check the pipe right where they come out of the heads. It depends on what type of exhaust system you have on your Road King. If the stock exhaust is on the bike, the rear cylinder exhaust is directed to both mufflers. With the exhaust from the front and part of the exhaust from the rear cylinders going to the right side muffler, it gets more exhaust than the left side and runs hotter. Like I said, check the temp of the exhaust pipes at the cylinder heads. If one of them is cold, that cylinder is not firing. As long as both of the pipes are hot there, you're fine. Just ride the bike and have fun.
I am not sure if the bike is a 650 or 1100 but in either case it sounds like a fuel issue or and air leak. When the carbs were off for re-jetting did they get cleaned? The slow circuit controls to about 2000 rpm and it sounds similar to your problem.
The first thing to look at is the carb synchronization. If the front cylinder is lagging, it can give the same symptoms. I do not think that the exhaust is a factor because the front is cold when running.
Spray some WD 40 at all the intake manifold area when the bike is running and see if the idle changes. the idle will change and push some smoke out of the exhast if the intake is leaking.
If both of these check good I would pull the carbs back off and clean the slow circuits out completely. This is delicate work and shoud be done by and experienced tech.
Establish which is the 'lazy' cylinder (touch the exhaust pipe header with a WET finger). There will be a marked difference in temperature. Change the plug on the 'lazy' side. If no better, check for a good spark - with engine running on the good cylinder, connect the other plug lead to a spare plug and grund the plug body. A weak/internittant spark will be readily apparant.
If there is a spark problem, replace the coil on the dud side. If not, check for equal compresion on both cylinders.
there is exhaust that runs from head to head under carburetor . there should be a damper that opens when cold and closes when hot . when it stays open after motor reaches operating temperature gas in bowl boils and gas is a vapor instead of a mist and causes motor to run lean .