Most model number stickers will be on the base cart like these examples.
If there is a REV. number we will need that also
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Some Brands will have the sticker on the engine

The Newer TROY BILT models are hiding them under the front foot
  


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Keep in mind the the model # of the pressure washer is different then the engine.
If you are looking for engine parts we will need the Engine Model number, here are some examples:
         




Honda Engine ExamplesExample:



Sometimes we need a more Detailed Model # below
  

And if you cant find the model number you can send us pictures