Biesse Chassis fitted with an Animal engine. No modifications have been made to the chassis to fit the 4 cycle engine. This kart is in beautiful condition. It started out in a promotional race, I purchased it and have few race weekends on it. The Animal motor may not even be broken in yet as I am still in the routine of changing the oil after each 2 sessions. It is race ready (for a 150lb driver). I have the Blue coil as well. Riggetti pump & caliper, Micron 3, + Misc. parts. Tires good.