Studdy,
I agree OS engine are very good values for the money, but there are better engines out there

If you want a good solid basher motor and your not racing I'd get the basic OS CV .12 or .15
Plenty fast and cheep, under $100 ($80 @ tower right now)
I think bashing is harder on engines than racing, Why spend the money on something you're just out there trashing?

I run MT12 standard shaft. slide carb in my mst1,(only for racing)
Around $140-$150 on the auction site I'm not alowed to name
Do a search Great engine for the money

Pretty sure the Losi takes a standard shaft