Hi. Tonight I again realized how complex yet simple an engine can be... I have (had) this problem with the NSR MC18 where one cylinder would completely stop running and then the other. Started with basics e.g. spark on plugs, fuel in carbs etc. etc. I was finding and 'fixing' potential problems everywhere e.g. compression checks, value checks, replaced plugs, set float levels, polishing the float needle seats, adjusting, re-routing fuel lines etc etc. Instead of doing all of this in one go, I ended up doing something and test, doing something and test. This resulted in weeks of stripping, 'fixing', testing, stripping, fixing testing... Tonight I again adjusted the float levels a little and when done, the one side was still dead. Removed the plug, cleaned and dried the electrodes and replaced. Kicked it once and boy we had stereo, both sides smoked like a charm! Moral of this long story, there is no shortcuts here boy, check and fix EVERYTHING at once and spare yourself the agony or stripping, replacing, testing, stripping, replacing, testing...