Honda doesnt make pressure washers so if you need pressure washer parts and not engine parts, then look on the base frame for a model number sticker.
Then type the model number into our search box or give us a call
 call 1-888-279-9274
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HONDA GCV190 ENGINE BREAKDOWN
GCV190 Engine Manual 
Your carb may differ from the one shown below. Call us with your specific Model type & Code.
This info is stamped in the aluminum block