I have a 2008 Yamaha 50TLR that would fire but not stay running. Usually fired once and died but sometimes would run 4-5 seconds and even run 20 seconds or so occasionally. Fuel flow seems good so I cleaned the carbs. After reinstalling motor continued with same issue for awhile then wouldn’t fire at all. On the spark side of things all 3 plugs looked carbon fouled so replace them but no change. Next I’ll check ignition coils, etc., but any advice appreciated. No experience with this stuff, relying on a Seloc manual.