I am about to build a Tiger 60 kit, and I need some help on picking an engine.
I am thinking about fabricating a cowl for the kit, so i will probably have to invert the engine or turn it sideways.

I am looking at 4 strokes:

Magnum XL-91RFS 4-Stroke - $200
O.S. FS-91 II Surpass - $250
Saito 91 Special AAC w/Muffler: K - $265
Saito 100 FA-AAC w/Muffler: QQ - $280
(any reason to go with golden knight other than looks?)

This will be my first 4 stroke. I am looking for durability, reliability, and user friendliness.

Any reason to go 2 stroke?