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Rebuild a Honda GX120?

Posted by gtr19 (My Page) on
Fri, Oct 15, 10 at 20:02

A little advice please. I am rebuilding/ reconditioning a Bluebird aerator with a Honda GX120. I purchased this from a Home Depot rental that was closing. The stop switch had been broken and rather than fix it, they just parked it. Then I came along, took a chance, and took it off their hands CHEAP. I replaced the switch and it started right up. I didn't really need an aerator. I kind of bought it for fun and to re-sell, but I got such a good deal I couldn't bring myself to sell it.

Ultimately, it sat for a couple years and got carb rot. So, I'm doing a little work on it to get it running for spring and was wondering how far I should go. I was considering rebuilding the engine both because I have no idea of the units history (rentals aren't exactly treated well) and for fun/ to learn. However, I don't really want to spend the cash if it isn't even close to needing a rebuild. A compression test showed 70 PSI, but I have read that compression tests aren't accurate on these motors due to a relief valve. It ran good previously and has no leaks that I can find; although it did seem oily under the gas tank behind the flywheel. The only thing that really concerns me is a lot of carbon build up in the exhaust port, but guess I don't really know what's normal.

Thoughts? Thanks...

Follow-Up Postings:

RE: Rebuild a Honda GX120?

Best bet is to run it. See if it runs ok, and if it smokes continuously, or just at start-up. A bit of damp looking oil in places does not necessarily call for a re-build! Keep a check on oil usage. No use spending lots of money, if it doesn't need it.
Oil under the gas tank could have been caused by the kid who worked for the company was always spilling gas by over-filling the tank!
And, if you want to learn about engine innards, go to the local mower shop, and ask for a bad engine out of their scrap pile, and practice on that! No use tearing into a good engine, that might have a very small oil leak!

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