Kyosho Shelby Daytona Bycmo Chassis

Hi, first run test for my freshly restored chassis bycmo with a Kyosho Shelby Daytona nostalgic. Engine is a CXP15, this engine were blocked when i had it ( in a lot of RC cars ). But the cylinder and piston are not damage, still looks in good condition with good compression. The spark is a R3 and i run it in factory settings, it runs great but a lot of unburned fuel comes out of the exhaust ! with a R4 spark it is worse ! because of the bad carburetion, the engine is too hot after 10 minutes and cuts . Even with a poor carburation, a lot of fuel comes out of the exhaust ? Maybe this engine is really used. Thanks for looking