The Iame built Komet Piston Valve spec engine is the best 100cc air cooled kart engine on the market! Straight out of the box the engine is competitive with blueprinted versions within its class. Try that with a KT-100!
It has a no-nonsense shoe-style dry clutch. With its low RPM engagement, you don't need to constantly fiddle with it to stay in the engine's powerband sweet spot. Once the clutch engages it doesn't let go until you stop, allowing a tremendous amount of drive time before servicing or parts replacement.
The simple two needle carb can be set without much adjustment needed while racing.