Hi I have a 2000 50 hp jonson it was just rebuilt before I bought it, we took it out on the water, it idels real rough but once you get above an idel it runs great. we took the carbs off spotless. so we have had for about 4 months and tried just about everything we can think of new plugs, cleaned carbs, had all the linkages adjusted, and still will not run good, we had it out to today and it keep stalling on us the only way to keep it runing was to pump up the bulb oh and the oil injection has been disconnected