GX390 build question

fiat124

New member
Hello...looking for some advice
On my 2002 Honda GX390 the block seems to have stress cracks so I got a used block. The cylinder sleeve ID of the replacment block is 3.467 in all areas. The spec I think is 3.4646 to 3.4652 and the service limit is 3.4710. Is this block a lost cause as its outside the spec? Any help would be great. Thanks in advance
 
If you do not plan on keeping it stock they can easily be bored. Oversized pistons are common and available.
Hello...looking for some advice
On my 2002 Honda GX390 the block seems to have stress cracks so I got a used block. The cylinder sleeve ID of the replacment block is 3.467 in all areas. The spec I think is 3.4646 to 3.4652 and the service limit is 3.4710. Is this block a lost cause as its outside the spec? Any help would be great. Thanks in advanc
 
Hello...looking for some advice
On my 2002 Honda GX390 the block seems to have stress cracks so I got a used block. The cylinder sleeve ID of the replacment block is 3.467 in all areas. The spec I think is 3.4646 to 3.4652 and the service limit is 3.4710. Is this block a lost cause as its outside the spec? Any help would be great. Thanks in advance
89mm piston is stock (standard bore.) 90mm pistons are available, as are other over-sizes.
If you just want to remain stock, have the cylinder honed to clean it up and a stock piston with new rings should still work fine with your current bore size.

We have new take-out genuine Honda pistons and rings available if you want to go that route, or aftermarket bigger bore flat top pistons as well.
Give us a call if we can be of any help.


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