Replace the [SMOKE SYSTEM] entry in your AIRCRAFT.CFG file with any of these:

[SMOKESYSTEM]

smoke.0=0.00, -0.70, 0.00, fx_redssmoke_blue

[SMOKESYSTEM]

smoke.0=0.00, -0.70, 0.00, fx_redssmoke_white

[SMOKESYSTEM]

smoke.0=0.00, -0.70, 0.00, fx_redssmoke_red


Note: the additional settings below are for wingtip smoke, if desired

smoke.1=0.00, -0.20, 15.00, fx_redssmoke_white
smoke.2=0.00, -0.20, -15.00, fx_redssmoke_white