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Type: Posts; User: Lawnboy77

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    Re: Lawnboy 10515 Engine Seal Issue

    Pull the carb and check the reeds. If they are bent, damaged, or if a blade of grass, or any debris is stuck in the sealing surface not allowing the reeds to fully close it will tend to blow some...
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    Re: Lawnboy 10515 Engine Seal Issue

    I wouldn't be so quick to assume a main seal. If a main seal is leaking to that extent on one of these 2 strokes it will really effect performance, and I'm not hearing you say it's lacking in...
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    Re: New Aquisition

    That mower looks to be a Model 6461 commercial made between 1986 and 1988.

    Edit: just remembered that this mower might be Canadian, which means the model numbers might be different up there, but...
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    Re: Trying to remove belt drive pulley

    Sounds very familiar. Nothing extra that I know to help. Torch heat, penetrating fluid and tapping with brass and hammer was my technique as well, ended up cutting it off with a Dremel. I ended up...
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    Re: Lawnboy 10330

    In reference to the notion that OMC was second fiddle to Victa. Well I don't know anyone that has experience with both, so not much way to compare if you haven't operated both fairly extensively. ...
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    Re: Lawnboy 10330

    Yes it is called a "Bricktop". Any of the Lawnboys from the 50s to the early 80s with the rectangular metal shroud like that were commonly called "Bricktops". Glad you have the Lawnboy bug. I've...
  7. Re: wingless' 1956 Lawn Boy Iron Horse Brick Top Model 5000 18" C-12 Aluminum Deck Re

    Awesome! Thanks for sharing!
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    Re: Lawnboy 10330

    I think the 10330 has a Tecumseh 4 stroke. Toro bought Lawnboy from OMC in 1989 and while they still produced many great 2 strokes after that, they started transitioning to 4 strokes in the mid 90s...
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    Re: Lawnboy 10330

    Not really a cult following, but more like folks who really appreciate a company like OMC taking engineering to the next level and manufacturing a machine that was, and still is the best in it's...
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    Re: Plastic vs. Walbro carburetors

    Going from a first gen F series with the old OMC plastic carbs to the newer Walbro carb requires a pulse hole to be drilled in the carb mating flange of the old OMC cylinder cover. It's a tight fit...
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    Re: lawn boy model #8073 surging

    Don't forget to clean the fuel inlet screen on that Walbro carb. If you aren't familiar with the setup it's kinda easy to miss it. Just pull on the little brass ring at the inlet nipple and it...
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    Re: lawn boy model #8073 surging

    I think that 8073 can be made to run great without enlarging the main jet. You can adjust the mixture to your liking with the one scew on the front of the carb once you get it clean and you can...
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    Re: lawn boy model #8073 surging

    I agree with the above reply, but want add a note. Don't forget to check for air leaks at the carb mating flange. I think that one has a metal Walbro so it's not as likely to warp like the plastic...
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    Re: Need chrome flywheel screen

    Okay I think I understand, so you just need the outer ring (part number 604271). They have a couple of NOS ones on ebay right now, unfortunately the extras that I have are probably not any better...
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    Re: Need chrome flywheel screen

    To my knowledge those flywheel screens 604272 were never chrome from the factory. The retaining ring around the perimeter is aluminum and sometimes polished, and the flywheel nut and the washer...
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    Re: 10343?????????????

    The V series engine is not really rare, used for many models in the mid 90s. It has the same rotating assembly as the OMC/Lawnboy F series engine, but has a slightly higher compression cylinder...
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    Re: Seal for fuel shutoff?

    Yes that would be an o-ring and yes the auto parts store is a good source for those o-rings. You can see the green o-ring underneath the hex nut in this pic. This particular valve is the one on my...
  18. Re: Lawn-boy Silver Duraforce 10323 mulching fan

    I agree with lee in that it probably depends on the grass you are cutting. Up north in the cool season grasses like Bluegrass and Fine Fescue it will probably work just fine, but down here in the...
  19. Re: Lawn-boy Silver Duraforce 10323 mulching fan

    I have had one model of F series that came with a mulch fan (model 10420) and I didn't notice it being of any use, so I removed it to. I have no experience with those Duraforce engines, but I know...
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    Re: Lawnboy for sale

    I think it was an LMR-10. A choke only, no primer carb. The same one that is on my 10420 and 680543. If you get it and want to convert to the metal Walbro just use the earlier version of that...
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    Re: Lawnboy for sale

    The 10401 is a nice little F series mower. I'm not real fond of the plastic carb on those, but other than that it's a great little mower. I have one that I inherited from my father and I ended up...
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    Re: Lawn Boy Supreme

    Good question! Considering the age of these mowers I'd say that parts availability is fairly good. If you just scan the parts catalogue for the model 8237 it probably shows 50% or so no longer...
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    Re: Lawn Boy Supreme

    Okay that's a nice one. The SP version of that one is probably going to be like a model 8237, made from 1978 to 1983. Those are really good F series cast aluminum deck mowers, very popular indeed....
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    Re: Lawn Boy Supreme

    Built prior to 1981? I'm not seeing any in the Supreme category prior 1981, that doesn't mean you aren't right though. Could you give more info? What about a pic?
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    Re: Gas Leak 10515

    That's great news! Sounds like a fluke to me. I like the way you keep care of that machine. You have a primer so yes you are probably right in that your carb is the plastic version, not the...
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    Re: Gas Leak 10515

    Sounds like a good plan to check the valve for leakage. I think I would also replace the carb needle and seat. The valve could restrict fuel enough that the engine fails to run when closed, but...
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    Re: Gas Leak 10515

    A 10515 is not a Duraforce, it's a self-propelled F series. I think you could be right though in that the needle and seat are not functioning properly, but for this to happen I think there would...
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    Re: Gas Leak 10515

    If the valve is working properly then it almost has to be a leaky tank. If the valve is working properly and you close it and run the engine dry then there should be nothing to leak out other than...
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    Re: Magnesium decks?

    Just the aluminum plate is different, the engine should be interchangeable.

    Edit: since the carbs might different between the two engines you may need to leave the original carb on the donor...
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    Re: Lawn Boy 3054 60yr Refresh

    Man both of those mowers look outstanding, that Krylon Almond looks like a perfect match.
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    Re: Magnesium decks?

    110 psi cylinder compression is good for an F series Lawnboy, but crankcase compression/vacuum would be the more likely issue in my opinion.
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    Re: Magnesium decks?

    Yes the fuel is drawn up through the nozzle in the carb, but not directly. When the air being drawn through the carb is at a sufficient velocity it creates a venturi effect and draws a sufficient...
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    Re: Magnesium decks?

    Well at this point I think I would check compression, not much else it could be. Sounds like maybe you have enough vacuum to draw the fuel from the carb throat, but not enough to make the venturi...
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    Re: Magnesium decks?

    Sounds like you are on the right track...I think once you get the fuel supply to the carb bowl up to specs your problem will be solved.
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    Re: Magnesium decks?

    You say your little 19 mag deck mower is not running, can you elaborate on that? Maybe we can help if we have a bit more info on the symptoms. Model number would be good. Will it fire at all, or...
  36. Thread: Photobucket

    by Lawnboy77
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    Re: Photobucket

    It's not a problem that they started charging for services, but 400 bucks a year is ridiculous.
  37. Thread: 7080 ratio

    by Lawnboy77
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    Re: 7080 ratio

    When you look under the deck just check the opening where the crank extends through the muffler plate (engine mount plate). If yours has the extended snout you will see it extend an 1/8" or so below...
  38. Thread: 7080 ratio

    by Lawnboy77
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    Re: 7080 ratio

    The extended snout is just the extra cast aluminum that extends down to the bottom of the muffler plate and contains an extra bronze bushing for crank support. On the 1970 and on residential mowers...
  39. Thread: 7080 ratio

    by Lawnboy77
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    Re: 7080 ratio

    It was made in 1970 and 71, should have a D-432 with a 2 ring piston and all-needle bearing connecting rod, so 32 to 1 would be the correct ratio. The difference between the D431 and D432 would be...
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    Re: Rain Rain Rain

    Very nice mower and lawn, thanks for sharing. Unfortunately for us down here in the desert southwest, brown and crispy is the norm for this time of year. The irrigation systems are a must for...
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    Re: Lawnboy Group pics

    Thanks Lee, probably won't be able to use PB much longer. Currently my I-Mac deck top computer is the only way I can share PB pics. My I-Phone and I-Pad are both a "no-go". I'm trying to keep...
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    Re: Lawnboy Group pics

    Thanks, yes it did get out of hand just a bit. It's good therapy for an old Air Force mechanic. Someday I hope to pass them on to family. As you can tell I'm a big brick top fan.
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    Re: My 3 lawnboys

    I was just thinking about how lucky I have been in regards to my mowers not having leaky needle and seats. I suppose I should knock on wood, but I have never had one leak it's fuel over the garage...
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    Lawnboy Group pics

    Going through my Photobucket and deleting duplicates and anything I don't want to try and free up some space for Photobucket. Anyway I thought I'd share this if I can, for how long it's up here is...
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    Re: My 3 lawnboys

    A very nice collection of Lawnboys. I like them all, but I'd have to pick the D-600 over them all.
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    Re: Lawnboy D400 5233 Question

    Okay yeah that sounds good, just go ahead and get one off of ebay. It seems like those are going for a very fair price. Thanks, it's kind of a busy time for me right now.
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    Re: Lawnboy D400 5233 Question

    Glad it's back up and running, I'll check for that reed plate tomorrow and let you know. I'm pretty sure I have a spare or two.
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    Re: Lawnboy D400 5233 Question

    I know I didn't specify, but the "Cast aluminum" statement was meant to be in reference to the deck material, not the engine...and most definitely a cast aluminum deck is a real good indicator of...
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    Re: Lawnboy D400 5233 Question

    I totally agree, I remember seeing the Ads that bragged about the F series engines as having the fewest of any parts of all the Lawnboy engines. From what I understand it was a very competitive time...
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    Re: Lawnboy D400 5233 Question

    Yes you are correct, the dual bronze bushing crankcases were pretty much standard on Lawn-Boy engines prior to 1970. The only exceptions that I know of were the specialty engines like the edgers...
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