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some small engines do not have a drain plug it may be at the bottom of the engine under neath where you can access it with a socket or hex key
or if none there , empty the fuel tank and pour the oil back out the filler tube
normally there is be around a pint (300 mls )
it may be a pain so check around underneath for the plug first
it is the same engine as used on lawn motors but with a different crankshaft to fit the pressure pump
Whoa! Wait when water pressure is at hose you have to pull the trigger on wand to release pressure so the engine can turn freely. It has so much pressure at wand that it will not let you turn enging over. If not It may have froze up. Check the oil first , no oil then it is locked up. If not you can remove pull rope cage and try to turn it manually.
Sounds like the machine is not getting enough water.
Please check your water pressure to the machine and also the water inlet filter in case its a little dirty.
The small black valve is called a thermal relief valve. If it is open you will have no pressure. If the water is getting hot enough to pop that valve, there might be internal problems with the pump.
The engine drain plug is on the main (square) base part of the cylinder block. I think it is 10mm. There is a compression washer to seal it aswell so it might need a bit of extra pressure to start it undoing. This should drain your block almost completely.
For diagrams go here, you will need the engine serial number and prefix. http://www.honda-engines-eu.com/en/welcome.html
For manuals go here, http://www.honda-engines.com/Engines_owners_manuals/own.htm
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