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Discussion Starter · #1 ·
My 97 wheeled string trimmer finally worn out the 6HP B&S engine. Everything else is still in good shape. I have a nearly new 6.5HP engine, that would fit. Only problem is ,the output shaft is over an inch to short!
I could easily make a shaft extension, (I'm a old retired experimental machinist) only thing I need to figure out is how to make sure the shaft is balanced close enough to not damage the engine with the extension added. It's not like there are blades on it, just a 4 inch drive pulley. Been trying to find someone else, that has tried this. (Don't want to reinvent the wheel if it's been tried before.) So far I haven't found anyone that has tried it. An old small engine repairman was pretty sure B&S use to make one some years ago. I could easily balance it if I removed the crankshaft. I don't want to do that unless I have to.
Would welcome any ideas or comments anyone about this.
 

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Hello Chipper, how about using a lawnmower blade adaptor to start with? You could turn the blade flange down in the lathe. If your crankshaft is threaded you could hold it on that way or drill and tap some 1/4 20 setscrew holes into the adaptor. Turn the adaptor end down to match whatever pulley you want to use. I'm sure it won't be balanced like a submarine part but making those adaptations wouldn't make it any worse than any other lawnmower blade adaptor.
 

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Discussion Starter · #3 ·
Thanks,
Basically that's what I had in mind, I have some stainless steel bar stock, that I was thinking of using, don't need to be stainless, but I like working with it.
 
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