First and foremost, That is one PHAT CAT :drool:
One thing I read was that Tecumseh stated the engine could be run up to a certain angle without issue or warranty voids so mini bike manufacturers took advantage of that. by tilting the engine the oil is actually going to stay in more of a "correct" location in the block when it matters the most. Hard runs uphill, abrupt takeoff, etc. instead of sloshing to the back and drowning the cam and all that. thing I don't like about the setup on bikes like your cat is all that stuff under the frame and vulnerable.