Which to rebuild? Honda GVX630 or 670

kansan

LawnSite Member
Location
Towanda, Kansas
I thought i was getting a great deal. A Hustler mini z with a gvx670 (600hrs) that needed a little work. Bad motor. But the shop owner gave me a "new" gvx630, said that he'd robbed a couple parts but they would interchange.

Tore down 670 and have 2 broken piston rods and broken camshaft. A couple nicks in the block, but overall looks fairly unscathed. Parts will cost around $750.

Start to look at 630 and realize there is no intake, exhaust mani., missing coils, missing stator. Cost to secure these parts is about $650.

630 is almost new, run barely long enough to put soot in exhaust port, but only rated at 20HP. 670 has 24HP and is setup to go on the machine.

Which motor should be invested in? I am new to this and have never dealt with Honda small engines.

Thanks in advance.
 

tundraman

LawnSite Bronze Member
If the 670 gave out in 600hrs how long do you think the 630 will last if you are able to mount it?
 

JimQ

LawnSite Bronze Member
Location
Beatrice, NE
Put the 630 back together. It sounds like the 670 really came apart.

You'll never notice the difference in HP.

Nearly new engine for less $$$.

Good luck with your project.

Q
 

ilike2mow

LawnSite Bronze Member
If the 670 gave out in 600hrs how long do you think the 630 will last if you are able to mount it?

I believe if i keep the oil level where it's supposed to be it will last longer than 600 hrs.

Is there a reputation for either of these engines? Good or otherwise?


Honda engines have a good reputation and burn very cleanly.
 

tundraman

LawnSite Bronze Member
I believe if i keep the oil level where it's supposed to be it will last longer than 600 hrs.

Is there a reputation for either of these engines? Good or otherwise?

I would rather overpower a machine than underpower it. If the 630 was made for that mower it should fit. Honda makes good motors, I would just make sure you are putting the proper motor on the machine.
 

Downunder Bob

LawnSite Member
Location
Queensland
I would repair the 670.
My 52 mini uses all the hp it can get.
I'm coming up to 700hrs now and noticed the engine with a few oil leaks. I started off thinking top and bottom seal but ended up changing pan gasket, governor seal, dipstick and oil filter O-rings.
In those hours I have replaced a coil, plugs and a bottom seal twice.
Every seal and o-ring just about fell apart in my fingers. I just feel the design of the mini back then sat the motor low in the frame and surrounded it with a lot of heat.
That's why I put a couple of coolers on.
I have never owned a Kawasaki so I can't compare and besides it all depends on the machine the motor goes into and the maintenance it receives, but I still feel my old design Honda 670 has been a very reliable engine.
After saying all this, my luck, next week it will probably fly apart.

P1000526.jpg


mini-z side (800x600).jpg


52 mini-z oil cooler .jpg


P1000531.jpg
 

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