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Lawnboy Duraforce for F engine?

Posted by bigal_mo (My Page) on
Thu, Jul 2, 09 at 8:57

Can I replace an "F" engine with a Duraforce? My "F" engine blew a rod. Will the Duraforce bolt to the "F" deck plate and muffler plate? The Duraforce is on a push Silver Series which I dislike while the "F" is on a self propelled S21ZSR (1989).


Follow-Up Postings:

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RE: Lawnboy Duraforce for F engine?

It's worth a try - you have nothing to lose in the attempt.


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RE: Lawnboy Duraforce for F engine?

It should work I think.
Good luck with the swap


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RE: Lawnboy Duraforce for F engine?

Never tried it but looks like a couple of the Duraforce mounts, those close to the carb, might be the same. I doubt it will bolt up and would appreciate knowing but keep in mind, even IF it does, you are mounting a 6.5 hp engine on a 4 - 4.5 hp muffler.

Walt Conner


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RE: Lawnboy Duraforce for F engine?

I tell you what, if it works I'm making one too. A Duraforce through an under-deck muffler would be awesome. Believe it or not, I would even REJET the Duraforce to give it the classic Lawn-Boy 'burble'.


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RE: Lawnboy Duraforce for F engine?

If you have an aluminum deck you will need a base plate from an aluminum deck Duraforce. Then you will need to drill one hole, the one on the discharge side of the deck. The other two will line up. It would likely be much cheaper to find a complete F engine though.


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RE: Lawnboy Duraforce for F engine?

OK, I have given up on the idea of replacing my "F" engine with a Duraforce. I wanted to mounted the Duraforce to the aluminum deck plate to use the bottom muffler. The Duraforce has a round exhaust with two holes that are closeer together than the usual rectangular exhaust. In addition the round exhaust extends beyond the rectangular plate. Just no easy way to make this work. Guess I'm looking for a rod assy and bottom crankcase now to fix my "F" engine


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