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Old 12-25-2019, 09:20 PM
Walter Keller Walter Keller is offline
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Default Lawn Boy vert to horizontal mods

Anyone here mod a vertical shaft Lawn Boy engine for use as a horizontal shaft ? I've seen the couple examples on Youtube from a few years back - looking at doing the needed mods for a minibike build I'm working on.
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Old 12-25-2019, 10:20 PM
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Better to just look for a old side shaft engine laying around a lawn boy is going to be unpractical
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Old 12-25-2019, 11:09 PM
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Its difficult to do. The easier way to do it is to get a horizontal shaft engine. If you want to keep this engine, you'll need a right angle gearbox.
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Old 12-25-2019, 11:37 PM
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Alot of the lawnboys are two strokes. Shouldn't it make it easier? Even though impractical. I agree. It's great to use what you got lying around but at a certain point it isn't worth it.
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Old 12-26-2019, 06:02 AM
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a two stroke is rather easy to convert;
you need to rotate the carb and fab a mount and that's essentially it already.

'sid
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Old 12-26-2019, 07:20 AM
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Yes a guy named russ and a few other people have you eill.need a custom engine plate made up and you will need to get the shaft on the crankshaft cut down to fit a normal clutch
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Old 12-26-2019, 08:11 AM
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If it's long enough. All the mowers I've seen seem to have short PTOs, but IDK.

I once wanted to convert a 149cc Lawn Boy 4 stroke we had to a go kart, but then I realized it would be a lot of trouble. So OP, is it a 2 or 4 stroke?
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Old 12-26-2019, 09:06 AM
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Quote:
Originally Posted by JTSpeedDemon View Post
If it's long enough. All the mowers I've seen seem to have short PTOs, but IDK.

I once wanted to convert a 149cc Lawn Boy 4 stroke we had to a go kart, but then I realized it would be a lot of trouble. So OP, is it a 2 or 4 stroke?
Yeah if it's the 2 stroke go ahead, mostly if it's a duraforce motor
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Old 12-29-2019, 02:58 AM
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Check out Russ2251 builds
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Old 12-30-2019, 06:33 AM
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Here's one of my favorite duraforce builds it's not only converting it from vertical to horizontal it's also modding it for more power too different carb a Tillotson head gasket mod too reed valve mods to make it have even more hp then 6.5 russ helped with this build and they estimate around 9 to 10 hp with all the mods


http://www.diygokarts.com/vb/showthread.php?t=1541

---------- Post added at 07:32 AM ---------- Previous post was at 07:31 AM ----------

http://www.diygokarts.com/vb/showthread.php?t=1682

---------- Post added at 07:32 AM ---------- Previous post was at 07:32 AM ----------

http://www.diygokarts.com/vb/showthread.php?t=1732

---------- Post added at 07:33 AM ---------- Previous post was at 07:32 AM ----------

http://www.diygokarts.com/vb/showthread.php?t=2399

Video of it running


https://youtu.be/1ETJey1MQGQ
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