1994 SL750. New engine. Carbs sat a while, I cleaned them out, looked good except for replacing two needle valves/seats. Starts readily, but won't rev beyond maybe half throttle. Except, occasionally, usually as I've given up and I'm returning to the dock, it decides to run like a bat out of hell. This lasts 15-20 minutes, then it wants to stall and bog again. Is there anything in particular I should be looking at? I know the fuel is new, the filter looks good and it's getting oil. I don't, however, know the origin of the oil in that tank, just that it is nearly full. My first thought was bad gas, but, I've run a few tankfuls through and it hasn't improved. Any ideas not involving high explosives or Craigslist?
