Upside down motorcycle engine

[wxo]

Very interesting design...
http://thekneeslider.com/nembo-motocicl ... le-engine/

[Maverick]

As mentioned, not an uncommon design in airplane engines. Upside down makes the engine not so tall over the crank for better pilot visibility.

250 HP!!!! Holy crap!!

[wxo]

For a motorcycle, this configuration appears ideal for the location of the intake tract (air coming in from the top front and down into the engine) and the exhaust (flowing out the back of the engine).

[Racin'Jacin]

Gives new meaning to the phrase "drop a cylinder"