My old GS1000 has been running excellent for the past 2 years up until a few days ago. The bike is ridden regularly year round. I was riding along the other day and the bike started missing under load. I made it home...barely....then decided to take it around the block the next day to see if the bike still ran poorly...yup no change (don't know why there would be any change as I hadn't done anything to it yet, lol).
I decided to pull the carbs , cleaned the air cleaner, checked the airbox for blockages, checked the airbox for leaks, disassembled the carbs and cleaned all the orifices and passageways (the carbs were clean prior to cleaning but did it anyway) I pulled the valve cover off to ensure the camchain didn't jump a tooth but everything lined up perfectly, decided to check valve clearances, everything was perfect as well. Reassembled the carbs back to the way I found them, replaced the sparkplugs, points, condensers then synched the carbs and fired up the bike. Choke works the way it should, bike idles but with a very slight miss, no hangup of idle when blipping the throttle, takes off nicely at very low rpm but when fuel is administered, the bike misses like crazy all the way up the rev line. (I also pulled the tank and cleaned it out but it was clean as well). The petcock filter was also clean.
The electrical also checks out as there is spark at all sparkplugs, one coil shows 4.3k ohms the other 4.8k ohms.
I've noticed that the points on the 1-4 side has a much fatter spark than 2-3 side.
I've changed the rectifier to the sh775, new battery last year, stator appears good. (I just checked it out cuz I just changed starter clutch assembly).
Any other suggestions? I'm at a loss on this one.
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