My goodness, this is still going on.

The TT .42 GP is a much closer equivalent (often cheaper) in price to the the OS .40 LA than is the TT .46 Pro, and the .42 GP still offers a very big advantage in power over the .40 LA. Both the LA & the TT were compared in a side-by-side test (along with a number of other 40-sized motors) in the March 2001 issue of MAN. The OS .40 LA is advertised at 1.0 HP (no advertised torque rating) & it actually developed 0.78 HP & 63 oz-in of torque. The TT .42 GP is advertised at 1.1 HP (no torque figure advertised) & it developed 1.11 HP & 70 oz-in of torque. The TT turned a 10-6 APC @ 13,000 RPM & the OS turned the same prop @ 12,100 RPM.

Additionally, the TT has its metal needle valve in the carb (where it should be), while the OS has its plastic needle valve bracketed onto its plastic back-plate. The TT is also 0.1 oz lighter, & has no history of peeling its cylinder liner.

The TT .42 GP actually makes more power than the OS .46 LA (1.2 HP advertised, 0.96 actual) & is a fair bit cheaper than that.

Not much of a contest.