how do i know how many degrees to retard when i spray people say 2-4 but which one???????????

 

I have sprayed the 125 shot several times on stock timing. I would say 2 deg would be fine but 4 deg would be very safe. They say 2 deg. for every 50 hp. That would be 6 deg for 150 which I think is a bit much, but better safe than sorry!

 

You can get away with 2, but I'd go with 3 just to be safe. Motors vary, so what might be fine on one car might be different on another