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

Some Brands will have the sticker on the engine

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

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