well today I went to a local mower shop and they had a used Honda 5hp engine for $120.00 with a 30 day warranty.And my go cart engine is blowing blue smoke and probably time for a rebuild. I don't know if I should sell my go cart or put a used engine on it and sell it. And I need some suggestions
Before you replace the engine check its compression. It should give you a 50 psi reading.
I would run the kart some more perhaps the rings are stuck from sitting around so long. Running the kart will heat the engine & help free up the rings.
You can pour a little automatic transmission fluid down the spark plug hole & let it sit for a week. The automatic transmission fluid will 'work' its way down and around the rings & help loosen them.