Shown left is the first ball bearing version.

Sizes .40 and .45

Bump boost port

Full fin diameter on the crankcase casting
Full, as cast head diameter, unmachined OD.

Tumbled polished finish

Butterfly throttle barrel

Narrow exhaust flange, hole spacing 0.937"

Second ball bearing version.

Sizes .40 and .45

Bump boost port

Full fin diameter on the crankcase casting

Full, as cast head diameter,
2 grooves machined on head

Tumbled polished finish

Butterfly throttle barrel

Narrow exhaust flange, hole spacing 0.937"

Now we loose track.
There may be models not shown
before and after this one.

Ball bearing version shown.

Sizes .40 and .45

Bump boost port changed to full bypass port.

Fin diameter on the crankcase and head casting machined.

Round throttle barrel

Narrow exhaust flange, hole spacing 0.937"

There may be models not shown
before and after this one.

Ball bearing Quickie version shown.

Added pad for size identification.

Fin diameter on the crankcase fins and head machined.

Wide exhaust flange, hole spacing 1.100"

There may be models not shown
before and after this one.

Ball bearing version shown.

Sizes .40 and .46

Added two bars in casting below exhaust.

Added pad for size identification.

Fin diameter on the crankcase machined.
Added head band and machined.

Wide exhaust flange, hole spacing 1.100"