OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines B&S 3HP - M#80202

Alright, I've been at it a couple of hours and having being the first time pulling one apart, I kind of did it backwards at first, but in the end I got there. Lesson's were learnt to say the least.

Anyhow, I managed to get the head off and pull the guts of her out. The carbon deposits on the valves were quite bad, and there was obviously presence of carbon on the piston. Initially the bore looked to be in great condition, and I guess in the scheme of things it is, however, after closer inspection upon removing the piston, there is scarification marks on the bore. They're not deep, but can be felt using a finger nail across the surface. The piston also doesn't look much chop. My best guess is that it was run without the filter on. It doesn't appear that the carbon deposits did the more so than grains of sand as a result of the motor being run without the filter housing on (that's how I picked it up).

The major thing I wasn't aware of is how to remove the flywheel and starting clutch assembly. I wasn't aware there are special tools for this, and I'll certainly aim to pick this up since this experience, however, with a little bit of ingenuity, I managed to remove it without damage. What occurred was that I removed the crank case housing prior to removing the clutch which made it extremely difficult to hold when trying to undo the clutch assembly. It was frustrating, but I found it quite funny in the end.

I'm an electrician, and am certainly no mechanic, but given my fault finding and problem solving skills, I managed to get through the process rather smoothly all things considered. Given how easy it is to take a part, I'm more than confident putting it back together. The timing marks are rather simple to follow also. No doubt I'll have questions upon putting it back together, as my aim in all this is to build a very smooth sounding little motor.

I have attached some photo's for you all. I'd love some input





























Moving forward, what's the best way to hone the bore to give it back a smooth surface? I'm going to try locate a new set of internals and this is where I start entering uncharted waters; it's all well and good pulling something apart and putting it back together, but doing work on the block itself has me scratching me head