The new Arrow-Racing GTR-21-V2 engines are now in stock at Hobby Pro USA.

The changes to the newest Ver II GTR vs the original engine are:
1. New crankcase
2. New carb body
3. New carb o-rings
4. New crankshaft
5. 6.5mm & 7.0mm Venturi's
6. OS P3 Turbo Glow Plug
7. New back plate (required to fit new crankcase)

The new Crankshaft has been redesigned with a much smoother finish/cut for a smoother power band and increased fuel mileage. I modified the crankshaft on my 2nd Arrow GTR-21 last summer, and now Arrow Racing has incorporated this mod to their Ver II crankshaft.

The new back plate allow more fuel intake for increased power.
Note: some of the original back plates will not fit the new crankcase because it fits too far into the case which causes the crankshaft pin to rub or bind on the back plate. This will quickly damage your engine, so be sure to use the Ver 2 back plate with the Ver 2 crankcase.