9.5 h.p.
Seems to be 6 hp.
1hp=42cc thus 8.5hp=357cc..
250cc= about 15.25ci. For conversions you can google "cubic centimeters to cubic inches conversion" and you should get a few links to conversion calculators.
Most lawn and garden equipment motors run about 1 HP for every 25CC ... so a 357 would be somewhere around 12-14 HP.
141cc = 5hp
1HP = 16cc [approx] therefore, 357cc/16 = 22.3125
on the blower most bearings are flange mount, and will have a Allen set screw locking the shaft to the bearing,
Look at the snow thrower as if you were walking behind it. About an inch or two above and to the left of where the drive speed control arm goes into the engine, there is a 3 inch pipe that comes out of the engine. On the end of that pipe is the drain plug. Make sure to tip the entire snow thrower back a bit at the end of emptying to get all the oil out.
5 or a 5.5 horsepower engine
6.5 hp
Snow Leopard (Uncia uncia)