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Old 11-02-2018, 08:17 PM
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Default Honda GX390 pulley shafts

So I found a pretty dang good deal on some broken generators that had these Honda 390's in them...I talked the guy down to 2 for $150 since he had about 12 of them....I was pretty excited all the way home.

I started to tear them down I noticed that they are 1" tapered shaft.............and NO KEYWAY SLOT !

Even my Duramax 18hp came with a key way slot.

They will be sitting on the shelf for later projects but, what are my options ???
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Old 11-02-2018, 08:49 PM
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Do they have the weird side cover too?

You can either replace the crank or try to find an adapter....or try to make one out of the generator rotor shaft. I stripped one of the windings and steel laminate for that reason and it's a PITA.

I have a GX340 generator engine that is (probably) going to get an adapter, but I can machine it myself. The side cover is also going to get the generator "bellhousing" milled off if I don't just replace it.
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Old 11-05-2018, 01:04 AM
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99% of pressure washer engines have tapered shafts. No surprise there. I would get another crank off Ebay and just replace the tapered one.
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Old 11-05-2018, 09:42 AM
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99% of pressure washer engines have tapered shafts. No surprise there. I would get another crank off Ebay and just replace the tapered one.
Never had any issues with the pressure washer motors...They have always been straight shafts with keyways.....But these tapered non key ones are a buggar...Im gonna see if the local machine shop has enough room to try and mill a keyway....with the engine intact...I definitely dont want to buy and install a different crank
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Old 11-05-2018, 10:15 AM
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This is what both of mine looked like. There's not much room to do anything but install an adapter or maybe turn it down to a stubby 3/4". The crank will have to come out for machining, so might as well replace it.
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Old 11-05-2018, 11:59 AM
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https://www.ebay.com/itm/BRAND-NEW-H...frcectupt=true

and if you have a messed up side cover:

https://www.ebay.com/itm/NEW-Honda-G...frcectupt=true

And if you really want to go fast :-) https://www.gopowersports.com/stage-...erformance-kit
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Old 11-07-2018, 06:56 AM
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Quote:
Originally Posted by 65ShelbyClone View Post
This is what both of mine looked like. There's not much room to do anything but install an adapter or maybe turn it down to a stubby 3/4". The crank will have to come out for machining, so might as well replace it.
I do have a clutch with tapered 1" bore ( maybe off jet ski ) not sure
Since the generator bolted up on this shaft and didn't use a keyway apparently held and ran off the tapered joint alone....You think it would hold the same pressure for a clutch ?
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Old 11-07-2018, 07:34 AM
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The tapers are like the morse taper for the chuck on a larger drillpress or the tailstock on a metal lathe...it wedged in there pretty good... To work the same... The clutch would have to have the exact same taper as the shaft.
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