GX620 Engine Swap

[LiftedValor12]

Hey folks,

I’ve been considering swapping the engine in my 2013 Valor that currently has a FJ400D. I was given a large generator that no longer makes power. Shop said it was past the point of no (cheap) return, so I don’t feel like messing with it. However, it’s got a Honda GX620 V Twin that still runs. It burns oil and has blow by, but I figure if I can successfully rebuild it, it would make a nice swap in the cart. Anyways, I have a few questions pertaining to the swap. As far as mounting the engine, what is needed? Can I use the factory cradle holding in the Kawasaki? What has to be done for a clutch, can the stock one go on the 620? I assume I will have to get a different clutch spring that allows the engine to idle without moving, which one would that be? Any other upgrades I should do?

Aside from all this, what can I get out of the FJ400? It’s in great shape, hasn’t really been run all that much. Has no issues.

Thanks in advance.

[CP241]

I don’t think you’re going to have much luck with that engine unless you buy a new crankshaft. Generator motors usually have a specific taper to the crankshaft that makes it very difficult to mount a clutch without heavy modification or fabrication.

[raydhd]

You might look for a straight shaft crankshaft on E -Bay. I sort of remember that a former member used to machine tapered cranks to straight cranks on vanguards. Maybe one of the other vanguarders is aware of the ins and outs of this process

[raydhd]

Right now on E Bay there is a straight shaft Honda GX 620 crankshaft .It does denote it is for the KO series engine.