ORIGINAL: scottywilkes

your obviously runnin very rich then, as the .50 should get about 10 to 15 mins out of a tank of fuel.

Why? Well its true it is a larger displacement motor, BUT, it only revs about half the revs of a good 28 etc, so it uses, average about the same ammount of fuel as a good 28.

During break in u will go through fuel FAST, if your doin the rich breakin, i heat cylce my motors, so during break in i get between 10 to 20 mins anyway.

Once u tune the motor to peak, u will get about 15 mins runtime give or take