This is a side exhaust ABC pumped long stroke engine designed to run on a tuned pipe and power F3A aerobatic models in the 1980's and early 90's for the Turnaround schedule.

It can run on larger propellers sized between 12 x 8 - 12 x 12 or 13 x 8 - 13 x 10

YS engines respond better than most engines to nitro and it likes about 20 % nitro in the fuel on a high volume tuned pipe like the Hatori 650 or OS Hanno pipe.

Shipped free Royal Mail 2nd Class signed for.