There is a hole in the top of the rod cap.Nice educational tool Ron. I always wondered why Lawn Boy dropped the speed lever on the brick tops, to me it really made sense.
I can barely make it out, but does that piston have the oil holes for the wrist pin, another thing not seen in later years. I have one old piston with these holes and I'm thinking about putting them in all my later pistons D and F.
Sure, you can run your mower at 4k , but for how long, I don't know.If you can run a snowblower at 4000rpm, can you run a mower at 4000rpm? I have some real PITA neighbours nearby and would love nothing more then to cut the grass at 4k!! They already hate the old Gravely commercial 5665 with snow blower that I use in the winter. My lawn is only 1/4 acre so the Gravely is too big to cut the lawn so I need something else. LOL.
Maybe for mix in the 4k rpm LB I can use the Castrol R castor bean oil that a buddy gave me about 25 years ago. He used to race bikes. The exhaust smells great when using the Castrol R.
Here's the best pic I could get on the piston.Ron, the holes I am referring to are in the wrist pin bosses on the bottom of the piston and are for wrist pin lubrication. For some reason Lawn Boy stopped putting the holes in. They are only seen on the older engines.