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Are you sure the "pressure relief" (decompression lever) is closing ? If it is not allowing the valves to seat properly then you would have this same problem. Also did you "reset" the "low oil pressure" fault ?

Your valves and seats looked fine, so a little touch-up from the machine shop should be all they need.

Honestly any good (non-synthetic) engine will work here. The 5W-30 is just extremely common to find now a days. Your only going to be using this oil for just a very short time. Five to ten hours max. Then drain it out, replace the oil and filter and run it about another ten hours. Then you...

The last hone job looks pretty good. Your up and down speed was to fast though. The crosshatch pattern should be more pronounced, more widely spaced. You should have used more hone oil also. Still all in all a pretty good job ! Put some pistons in there and run it !

Your correct. The first ring is the silver one. It should also have a mark on it. The mark usually goes downward.

Who ever said "lap the valves until it covers the seat" ? I sure did not. You only lap the valves until you get a solid contact around the valve face. What you said about the only reason to "lap" the valves was for valve cooling was incorrect. It has nothing to do with valve cooling. It has...

I love the "Nord-Locks" ! I especially like to use them on the Injection pump in place of the "wire-nuts" .

Now all that is required is a little "elbow grease" !!! So get after those valves ! Oh, and when you get your engine running a little video would be great !

In all honesty, get some good lapping compound and go after them. The seats don't look bad at all, and a little lapping will bring them right up to spec !

That part about lapping is not correct. Lapping is the oldest way to get a true positive seal between the valve and seat. Also most all production valve seats are made with "powder metallurgy" . This allows the manufacturer to precisely match their valves and seats with the head material used...

You can "lap" the valve to the seat with Lapping compound, or you can take the engine to a small engine repair place and they can use a seat grinder on them. Those valves of yours probably can be saved. If you take it to a shop they can determine if the valves can take a grinding or not. As far...

Your piston looks fine. Yes you have a bit of carbon build-up and that is due to the unburned fuel. Your probably correct about the low compression causing the build-up. The cylinder bore is a bit scratched up. Maybe some dirt got in there when it was running and that helped the rings go also...

I forgot to add. Don't use "synthetic" oil until your new rings are broken in. Us a good 5-30W standard oil. Also when you first start-up, load the generator to at least 80% . Keep it at this for at least two hours. Four hours would be better if you can. Then shut-off the unit and drain the oil...

It is hard to judge the condition of your piston rings and piston. You need to totally clean it, and then check for "scuffing" marks. The bore has signs of scuffing and needs a good honing. I'm pretty sure you don't need a rebore, just new rings and a good honing and you will be back up and...

If you have no ridge at the top of the bore then a good "ball" hone will do just fine. Just get a ball home that is larger then 78mm. Use a good honing oil and keep a steady up and down motion going. Once you see a good crosshatch pattern emerge then stop honing.

It's hard to tell from your pictures, but it looks like you have some cylinder "glazing" going on there. It would be a good idea to remove the piston and run a good ball hone down there. Clean-up the piston and check for "glazing" on the sides of it. Then some new rings and bearings and your...

That's funny ! When I was working at this transmission shop we had a mechanic who thought it was OK to "borrow" anyones tools if he didn't have one. He never stole any tools but he would return them dirty ! One day he tried to "borrow" this old crusty mechanics wrench, and just as he was putting...

I don't care how long you've worked as a mechanic, but sooner or later you will need help remembering how something went back together. In todays world with so many different vehicles and systems it is overwhelming at times the amount of information you must remember. At work there are over 27...

It's nice to know that I'm not the only one to use the parts manual during a rebuild ! For decades I always used the parts manual to view how the different parts went back together. My father taught that to me when I was just a wee laddie ! The guys in the parts department always that it was...