Lawn Boy 2 Cycle Engine Seized

I was fixing a grounding problem on the LB and I accidentally disconnected the automatic oil feed line. I reconnected the line and ran the engine for about an hour. Then the engine started to make strange noises and suddenly stopped. I tried to re-start the engine, but I could not turn the engine with the pull starter.
About an hour later, I tried the pull starter and I could turn the engine, but it would not start.
I have not had a chance to check anything, but I'm afraid I seized the engine either because the oil line came loose, or the automatic oil-to- gas system failed.
If the engine seized, what will I have to replace/repair? The engine is one of the last 2-cycle Lawn Boy manufactured themselves. Right now I think I would need a new piston and piston rings. Will the cylinder have to be honed or rebored?
Thanks in advance for your help, tips, suggestion, comments.
Manjo, Lawn Boy self-propelled with auto starter and auto fuel mix (oil automatically added to fuel)
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What model is this? I have worked on electic-start LBs, self-propelled, and 4-cycle ones...wasn't aware of an oil-injected model!?
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Manjo wrote: ...

All of the above at a minimum -- if it's Al block, there may not be enough lining material to rebore cylinders. Bearings and shaft probably as well. In all, if it actually ran w/o lube, new engine is probably cheaper than parts will be and the rebuild is a question anyway depending on how badly scored it is and whether warped head as well.
--
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It's a 1991? model M21EMRD. I'm away from my manuals (by several hundred miles), but the LB online service manual is ibwpmm.pdf. It's been a great mower. Started easily and ran well until the engine kill mechanism failed and I got in there and accidentally screwed the auto oil injection system.
Until 1994, I had been using a 2-cycle push Lawnboy for 18 years. When it died, I naturally went with another LB 2-cycle.
If the parts costs get too great and I can't find a decent replacement engine, I'll reluctantly go to a self-propelled 4-cycle lawn mower.
Manjo
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You will probably have a lot of trouble finding the necessary parts. Toro bought Lawnboy about the time you bought your machine, and proceeded to do away with the Lawnboy engines, due to the government mandated pollution controls. They also sold their last two-cycle snow thrower engine design to Briggs and Stratton, who offer limited support and parts for it (looks like a combination of LawnBoy and Suzuki designs).
Manjo wrote:

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Husky,
I've been away and on the road for the last 6 weeks and I'm only starting to look into the problem. I'm finding what you're saying to be true. There are a couple of web sites (non-LB) that have the crankshaft and some gaskets ($245) and other parts (many $'s). I'm going to tear down the mower this week and try to assess the damage and required parts. If I get lucky, I might find a similar used parts- engine. Otherwise, I'll be looking around the stores for a 4-cycle repalcement. Home Depot already has clearance sales on riding mower and I suspect there will be other good deals as the summer winds down and turns into Fall.
Thanks, Manjo
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Geez, a 17 year old 2 cycle lawnmower with a seized engine? And you have to ask here what to do with it? Put it into the scrap heap.
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On Jul 14, 9:03am, snipped-for-privacy@optonline.net wrote:

Being a CYB (Cheap Yankee Bastard) and always interested in tinkering a bit, I'd like to keep the old girl running if I can. My previous LB ran for 14 years and ended up on the trash heep. It was still running like a top (with a wobble heare and there) and cut the grass. But what you write is probably true.
Manjo
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245 for parts, for 275 I just got a 6.75 hp Toro with adjustable drive speed. Since when did lawnboys have a seperate oil system, i dont think they ever did.
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LB Model M21EMRD circa 1991. I think it was the last series of LB manufactured engines. Freshlube Oil Injection system mixed 2-cycle oil with gas. I have no idea how it did it, but it did it well for 17 years.
$275 is probably a bargain for a new mower and I will look into a new mower soon.
Thanks,
Manjo
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