Guys I recently got a 3port race with about a gallon through it and was in storage for about 6 months. Prior to storage after run oil was applied but the engine was not cleaned out.

When I ran it on my buggy (Hyper 7), it fired up and idled ok but would sputter and die if I gave it gas. I took the engine apart and gave it a thorough clean and lube before putting it back together, unfortunately that did not solve the problem. Changing to an OS carb (from an old VSPEC not the J type carb with the red OS restrictor) helped some but it would only run decently after running it down our local track's straight 4x WOT with it sputtering away. Sputter goes away midtrack on the 4th run. It would run smoothly after that but once it cools down I have to do the same thing again.

The fuel and air filter systems are ok. Am not sure about the type of GO carb installed but it looks like the one with the long LSN. Any suggestions would be greatly appreciated.

Cheers