Engine Piston Kit Compatible with Briggs & Stratton Model 384445, 384447, 385442, 385445, 385447, 385777, 386442, 386447, 386777, 389445, 389447 38 Cubic Inch Standard Vanguard Engines 75.5mm #843805

One Standard Size Piston Kit Compatible With Briggs and Stratton Replaces Part Number 843805 Compatible With Briggs & Stratton Twin Cylinder Vanguard Engines With A 75.5mm Bore That Have These Model Numbers and Used After Date Code 07062900 384445, 384447, 385442, 385445, 385447, 385777, 386442, 386447, 386777, 389445, 389447, 389575, 38e347 Please Look Up Your Model Type And Code To Ensure Piston Rings Are A Proper Fit For Your Briggs And Stratton Vanguard V Twin Engine

• This small engine piston is Compatible with Briggs and Stratton 38 cubic inch Vanguard engines.
• MEASURE THE BORE BEFORE ORDERING - A caliper across the old piston crown settles which version of the engine you have, and it is the only test that does. Ordering by horsepower or by year is how the wrong part ends up on the bench, because the same machine was often built in more than one bore.
• CHECK RING END GAP IN THIS CYLINDER - Not in the old one. Square the ring in the bore, measure the gap with a feeler, and check side clearance in the piston groove while you are there. A ring that is tight at operating temperature will break a land.
• WORK OUT WHY THE OLD ONE FAILED - A scored bore had a cause. A hardened crankshaft seal or a split impulse line leans the mixture out and will take the new piston the same way it took the old one. Pressure and vacuum test the crankcase before the machine goes back together.