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Having trouble identifying this honda... It says 389cm on the crankcase casting, so i assume it's a GX390. If someone could confirm. On a simpson 4200 psi horziontal pressure washer. need to clean carb and adjust valves. and the usual honda sticker on the recoil is missing.

I would say GX390. the important numbers and letters are stamped into the side of the block. Will be 4-5 letters followed by 7 numbers, and then off to the side will be 3-4 more letters. Something like GJARA-1234567 and the something like A1A

GCBDT-1168783

Here you go Scrub


punch the numbers that you posted into the prefix serial number fields and there will be the complete parts information for your specific engine.

Thanks ILengine, much appreciated

Got the carb cleaned tonight, this particular one is Keihin carb, the pilot adjustment screw was stuck/seized pretty bad and it snapped off, i was able to cut a slot in the remaining portion and with the help of Liquid wrench, got it out without it breaking anymore. anyhow,, i found out a pilot screw from a Ruixing carb on GCV160 will fit in place of a Keihin pilot screw on a GX390. Runs great now.

Scrub, I don't if you know this or not, but the idle mixture adjustment screw(pilot screw) is suppose to break off if you try to remove it. It is part of the emissions tamper resistance Normally they break off and then you can use a small piece of fuel line to apply pressure to the broken end and unscrew it.

Wow! i never knew that, thanks for telling me. Learn something new everyday.

Our wonderful government, saving the environment one pilot screw at a time...