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  1. #11

    Join Date
    Jul 2013
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    446
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    Michigan
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    Kubota, Lawnboys (5), Toro/Suzuki's (2), Honda HR17

    Re: Suzuki 2 stroke beater

    My 8481AE has the F engine but with the metal Walbro carb. How does the metal carb compare to the plastic ones commonly found on F engines? Any increase in power output or no?

    Jeff

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  3. #12
    Dixieboy's Avatar
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    Jul 2017
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    Tennessee
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    Craftsman, Troybilt, Mtd, Murray, Lawnboy, Central park

    Re: Suzuki 2 stroke beater

    The Walbro carb did add a little power but not much. The power increase was more from mixture control. It added adjustable throttle, choke to eliminate primer, better fuel mixture thru rpm range, more consistent carb settings, etc. The engine would run cleaner than with the plastic carb. But it had its problems , the throttle cable/choke settings were very had to set right and keep that way. The alignment of the air filter box is critical to setting the cable. If the alignment of the cable air filter box wasn't right then the choke would not completely close making a cold start almost impossible. We even added a primer to some of the models because of the problem so a user could make the cold start.

  4. #13
    javjacob's Avatar
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    Sep 2014
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    187
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    Missouri
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    John Deere, Honda, Lawn Boy, Stihl

    Re: Suzuki 2 stroke beater

    Quote Originally Posted by Dixieboy View Post
    Lawnboy F-engines typically put out about 4 hp, some time a little more. The different configurations effected power like carb, muffler, muffler plate, how the ports were machined in the block, air filter, etc. I was referring to the recoil starter on the top of the lawnboys and Toro/Suzuki. Previous f-engines and older lawnboys had the old side mount starter. I hate the side mount, I adapted a Suzuki starter to a f-engine in about 1986 and then we developed it for the f-engine lawnboy. No kidding.
    Did you work for Lawn Boy? I actually like the side mounted starter. Its easy to remove the entire assembly with 1 bolt and replacing the pull rope and spring are simple. I also like how the rope routes behind the motor and up the push handle so its out of the way. The top recoil has the rope exposed above the motor and they get caught mowing under trees and shrubs ect.

    I have 2 Lawn Boys with the side mounted starter and 5 with the top mounted starter. 3 of the top mount starters are F series and 2 are Duraforces. The ones I hate are the Duraforce set up because the shroud cover is one solid piece with the recoil mounted under it. If you have to remove the shroud cover you cant just take it off and set it aside. You have to just leave it hanging on the pull rope which is a PITA.

    My only other complaints about the Duraforce is how they mounted the coil on the cylinder head and the air cleaner is a PITA to get to at the back of the deck.
    My only complaint about the F series (and D series and C series) is the cylinder and head are one solid piece so they cant be re sleeved or plated ect.
    1998 John Deere 345
    1983 Lawn Boy 6301
    1987 Lawn Boy 7351
    1997 Lawn Boy 10518
    1999 Lawn Boy 10525
    1996 Honda Harmony HRM 215
    2015 Stihl FS94R

  5. #14
    javjacob's Avatar
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    Sep 2014
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    187
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    Missouri
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    John Deere, Honda, Lawn Boy, Stihl

    Re: Suzuki 2 stroke beater

    Quote Originally Posted by jp1961 View Post
    My 8481AE has the F engine but with the metal Walbro carb. How does the metal carb compare to the plastic ones commonly found on F engines? Any increase in power output or no?

    Jeff
    There were more than one plastic carb for the F series. They used plastic carbs then went to the Walbro carbs then went back to plastic carbs. The HP rating went from 3.5HP on the early models up to 5HP on the later models. The 5HP models had plastic carbs. I think the Walbro carbed F series were only rated at 4HP and 4.5HP.
    With all that said I question whether any of them actually had any difference in power.
    1998 John Deere 345
    1983 Lawn Boy 6301
    1987 Lawn Boy 7351
    1997 Lawn Boy 10518
    1999 Lawn Boy 10525
    1996 Honda Harmony HRM 215
    2015 Stihl FS94R

  6. #15
    Dixieboy's Avatar
    Join Date
    Jul 2017
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    26
    Location
    Tennessee
    Mower
    Craftsman, Troybilt, Mtd, Murray, Lawnboy, Central park

    Re: Suzuki 2 stroke beater

    I did work for Lawnboy for about 3 1/2 years from 1984 to 1988 when headquarters were in Memphis, Tn. I was an engineer in the Advance Products group(only three of us in the group). I ran a lot of F-engines on the dyno. It was great fun. I didn't make the move to Wisconsin in 1988 and was laid off as were many others. I did develop the top mount starter for the F engine and all the mounting components. The F engine was pretty simple and inexpensive to manufacture, thus no removable head. As you know the entire block is only two pieces. I have five running lawnboys , all but one f-engine the other is a D. I have never even looked a Duraforce over , they came after the company was no longer a division of OMC. When I saw the first Lawnboy with Tecumseh I thought "there goes the neighborhood" and the two cycle roots. EPA was killing the two stroke. And just me but I never thought the side mount starter gave you the ratio to crank the engine very good. We did make little guide lopes to mount on the handle anywhere you may want to route the pull rope differently.

  7. #16
    javjacob's Avatar
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    Sep 2014
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    187
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    Missouri
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    John Deere, Honda, Lawn Boy, Stihl

    Re: Suzuki 2 stroke beater

    That is really cool. I do agree the F series is as simple of an engine anyone has ever made and that's what I like most about them. They are so easy to work on. They also make good power and are as durable and reliable as an engine can get. There is nothing not to like.
    1998 John Deere 345
    1983 Lawn Boy 6301
    1987 Lawn Boy 7351
    1997 Lawn Boy 10518
    1999 Lawn Boy 10525
    1996 Honda Harmony HRM 215
    2015 Stihl FS94R

  8. #17

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    Two-Stroke's Avatar
    Join Date
    May 2010
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    1,576
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    Atlanta, GA/Cleburne County, AL
    Mower
    Lawn Boy, Toro, Jacobsen

    Re: Suzuki 2 stroke beater

    Quote Originally Posted by Dixieboy View Post
    I did work for Lawnboy for about 3 1/2 years from 1984 to 1988 when headquarters were in Memphis, Tn. I was an engineer in the Advance Products group(only three of us in the group). I ran a lot of F-engines on the dyno. It was great fun. I didn't make the move to Wisconsin in 1988 and was laid off as were many others. I did develop the top mount starter for the F engine and all the mounting components. The F engine was pretty simple and inexpensive to manufacture, thus no removable head. As you know the entire block is only two pieces. I have five running lawnboys , all but one f-engine the other is a D. I have never even looked a Duraforce over , they came after the company was no longer a division of OMC. When I saw the first Lawnboy with Tecumseh I thought "there goes the neighborhood" and the two cycle roots. EPA was killing the two stroke. And just me but I never thought the side mount starter gave you the ratio to crank the engine very good. We did make little guide lopes to mount on the handle anywhere you may want to route the pull rope differently.
    Couldn't agree more.
    Robin: My name is Richard Grayson. The other kids call me Dick.
    Batman: Well... children can be cruel.

    from The LEGO Batman Movie

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