Where can i find specs or operating instructions for a gas operated home water pressure washer, with no mfr.?

Question:My pressure washer motor is a 3.5 hp Tecumseh 4-cycle motor: model # H35-45696X-B with a DOM: 6074R. The only identifying mark on the pressure washer pump is a circular stamp in the casing showing 7 raised dots out of 12 spaces, with 95 in the middle of the stamp.

Answers:
Both Kärcher and Campbell Hausfeld have used Tecumseh engines for their pressure washers. However, the smallest engine I have found for either manufacturer is 4 HP. A manual for Kärcher's pressure washer is at:
http://www.karcher-usa.com/support/downl...
A manual for Campbell Hausfeld's pressure washer is at:
http://www.campbellhausfeld.net/wcsstore...

The circular stamp may be a date code, perhaps the seventh month (July) of 1995. That would be consistent with your having a 3.5 HP engine, which would be considered too small by today's standards.