mfi bud. It was last setup when running 15psi but since the rbuild i wound the bleed valve back as far as it would go. Have done 100 miles since and it seemed ok till now when i was out giving it some but started to slow down when i put my foot on the accel pedal. After it stopped i can't get it to start and the plugs are black but fine b4 i took it out for a spin.