Honda gxv390 engine

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john2189
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Honda gxv390 engine

Postby john2189 » Thu Dec 10, 2020 12:29 pm

I would like to install battery starter to this motor. I have a gx340 motor I took the flywheel off for the ring gear and comparing it to the one I took off, the magnet that fires the coil is off about 1/4”. Would they have changed the timing for battery start? Would 1/4” make that much difference?
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Jim Becker
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Re: Honda gxv390 engine

Postby Jim Becker » Thu Dec 10, 2020 12:53 pm

More likely the timing is different between the 340 and 390 rather than being different for an electric start. Note that most specs are the same between the two models, but somehow the 390 produces more power and max torque is at a higher speed. Changes in cam and ignition timing seem like probably differences. I don't think I would try to mix cam profile of one model with the ignition timing of the other.

Maybe you can move the magnet?

john2189
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Joined: Thu Oct 26, 2006 7:17 pm
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Re: Honda gxv390 engine

Postby john2189 » Thu Dec 10, 2020 1:43 pm

Thanks Jim, that’s a possibility. Thought about machining the original for the ring gear, but not enough material to do that.
'49 Cub (Vince)
'72 cub (Cecilia)
'41 allis B
'42 Allis B
'71 154 Cub Lo-Boy
656 Wheel Horse
C-165 Wheel Horse
Simplicity 20 HP Sunstar

john2189
10+ Years
10+ Years
Posts: 1504
Joined: Thu Oct 26, 2006 7:17 pm
Zip Code: 44657
Circle of Safety: Y
Location: Minerva,Ohio

Re: Honda gxv390 engine

Postby john2189 » Fri Dec 11, 2020 11:40 am

Ok I put the flywheel on and pull started it. I can’t tell any difference. It will run full throttle with blades on, sounds good. Now to buy a starter. 

thanks for your input 
John
'49 Cub (Vince)
'72 cub (Cecilia)
'41 allis B
'42 Allis B
'71 154 Cub Lo-Boy
656 Wheel Horse
C-165 Wheel Horse
Simplicity 20 HP Sunstar


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