About 2 yrs ago I found a Rover Wayfarer with a 4 stroke Briggs engine on it. The compression was hopeless( 25 pSi), so I put it away for another day). Well the time has come, and I have stripped it apart, taken out the piston, push rods, carby, flywheel, etc etc. My assumption is that the poor compression is due to the rings being worn out, or the valves not sealing well enough. I ordered new rings for it ( not the $90 Briggs ones), but the cheaper copy ones from China ($30) The photo below shows both the old rings in silver and new rings in black. The question is why are they significantly different in circumference? The rings are aligned in the top part of the image(beginning at the same spot), but by the time one passes around to the other end there is a difference of very close to 4 mm. I get that the wear would be where it rubs on the barrel wall, but why the wear at the ends?
Last edited by twostroker; 27/10/2105:13 PM. Reason: Grammar modifications
