I have 1994 SP with less than 15 hours on rebuilt motor. Last year machine wouldn't stay running in lake (but it would start on the trailer) and carb was rebuilt by dealership but still didn't run. This year I replaced all grey fuel lines and fuel selector valve and drained and cleaned gas tank, and now it runs fine but starts hard. I'm concerned there still maybe some crap in carb. I want to avoid tearing apart carb. Can anyone recommend an additive besides stabil that would help clear/dissolve any remaining junk?