Briggs and Stratton Intek 310000 and 330000 Series 4 and 5 Engine Spare PartsThis engine is most often seen on Ride on lawnmowers, Garden tractors and other fairly large items of equipment and ranges in HP from 10HP to 13HP depending upon model and is most often branded as - Intek, I/C, Power Built, 3120, 3125 or 3130. It has a plastic top cover which gives it a rounded traingle type shape when viewed from above. Its Model, Type and Code numbers are stamped into the top edge of the rocker cover and the model will begin with 31 or 33 e.g. 310707, 31A507, 31E677, 31Q777, 331777, 33M977 etc.