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The crankshaft on one of my self-propelled mower's engines has a thrust bearing and washer between the radial bearing and crank. This mower had a pully on the crankshaft to drive the self-propelled assembly. I don't see anything in any of my service manuals about a thrust bearing, even on...

Following the tips in the service manual, I was as careful as I could be removing the bottom ring from an F-engine piston and broke it anyway. Anybody have a good tip to keep from breaking these? Maybe heating the ring? Freezing the piston? Some sort of magic lubricant? I'd really like to...

I'm going to hone at least two of my F-engines (I have at least six to mess with). Looks like a flex-hone is the way to go. I can't find a spec for what grit to use, though. Any of you guys have experience with different grits and what worked the best? BRM has flex-hones in 120, 180, 240...

Does anyone out there have a good way of checking crankcase leakage? I've got a good F engine with 92 cold PSI, so I'd like to use it without breaking the crankcase open or replacing the seals if they're OK. I'm thinking of rigging up a flange to put on the exhaust port and putting a slight...

Hopefully one of you old timers can help me with this head-scratcher. I built a carburetor for my NOS R7271 and installed it. Once I got the shroud on, I noticed that the Speed Control Lever (Part No. 611070) was completely hidden from view (see photo, cover and filter not on). This made no...

Unlike other Lawn-Boy carburetors, this one's needle is at the top of the carburetor, the needle goes directly into the fuel nozzle from the top. The carburetor is black plastic. There's no spring. It's brass. It takes a 1/4" wrench to adjust. I could not find this carburetor in the big...

"How I Spent My 2020 Summer Vacation" by FuzzyDriver Nothing on this mower was left as-is. This was not originally intended to be a museum display candidate, but it almost turned out that way during the three-month rebuild. Everything was torn down to individual components, inspected...

I can't be the only one who noticed that after-market "universal" wheels either don't have felt washer wells or have wells that are too shallow and/or not deep enough. Not to mention that they aren't exactly the right width, so when you tighten them up with the right outside washer you can no...

I'm replacing the F engine on a 7268. One engine has the non-enclosed muffler and the other has the enclosed one (you know - the one we cook outside to de-carbon). I'm leaning towards the enclosed one to minimize heat transfer and it just looks like it would be quieter. Anyone have a good...

I bought a new (never been started) R7271 last year (no - I'm not kidding, it's never had gas in the tank even). The serial number is B264C0056. This type of serial number does not appear in the service manual. The C is really a C, not a zero. The B should be for a 1983, but from what I can...

The wheel cover on my S21ZSN will not stay against the rear wheel. With a lot of force you can make it snap into the wheel, but as soon as the wheel turns, the cover pops out except where the drive pinion washer holds it in. This makes the opposite side open about 1/4". I cleaned the areas...

A very old local dealer is going out of business. He was a Lawn Boy dealer up until about 1992 or so. Don't get too excited, he doesn't have a big stock of NOS Lawn Boys :shocked:. He only has two NOS left and neither is complete, one doesn't even have an engine. I bought his last new R7271...

My S21ZSN would not pull itself, but was kinda hard to push or pull backwards. When I lifted the rear the wheels would turn, but as soon as I set it down they would stop. I read the other thread about this, which gave me the right start on the problem. I took the bottom of the drive case off...