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I have a gx620 on my Hustler. It's over 20 years old. It started a oil leak this spring. With mowing season over I want to take care of it. My question is, seeing that the gx620 is no longer available, should I try to find a replacement engine or have the present engine repaired. I see there is a gx630 but not sure if it would be a direct fit. Any advice is appreciated.

Look at the spec sheet on both, mainly the footprint / mounting bolts , shaft size etc.

Going from the old GX twin series to the new GX twin series is a little more complicated due to Honda doing a redesign a few years back. The ignition when from a open to run to closed to run which means the ignition modules have to be grounded to spark, which requires a different key switch and other wiring changes. Also they changed the engine design and when to a semi-hemi style head which resulted in the exhaust mounting studs being at a different angle then the old engine.

Step said:

I have a gx620 on my Hustler. It's over 20 years old. It started an oil leak this spring. With mowing season over I want to take care of it. My question is, seeing that the gx620 is no longer available, should I try to find a replacement engine or have the present engine repaired. I see there is a gx630 but not sure if it would be a direct fit. Any advice is appreciated.

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I have only seen a larger twin Honda on one zero turn, and it was a Hustler. Unless the engine is leaking a lot of oil, I would just keep the oil checked and topped off and run it. Customers come in periodically throughout the year with oil leaks. I pressure wash the equipment and can rarely find the leak. Remember there are about 8 places a small engine can leak from.

You would replace an engine due to an oil leak?
Unless it is a crack in the block, oil leaks are much easier to fix than rebuild or replace.

Thank you all for your suggestions and advice. Now I just need to make a decision.