Sprocket size for a little guy w/ a 70cc HT

Just found out boygofast gave me more metal then he said. I received a 50tooth with the kit instead of the 44 tooth like the description said.

This means I can go
27 mph with a 50T
30 mph with a 44T
almost 34 mph with a 40T
37.5 mph with a 36T
39.7 mph with a 34T
42.2 mph with a 32T
45 mph with a 30T
50 mph with a 27T

These numbers are based upon me having a 27mph top speed on a 50T with the engine screaming, ready to blow a part.

Now I'm looking at getting a 32T to keep top speed around 40mph.

Would cruising at 32 mph be too much for the Kulana Moon Dog to handle? I know it will have good brakes, but will I beat the crap out of the bike riding it this fast?