I have a Honda GCV 160 pressure washer from TROY-BILT and when I start the washer the motor starts but when I use the Spray Gun the motor stops and the pressure washer is jam. I think it is the motor and here in Suriname they sell this this and then they can't repair it.

Tom, NGK BRP6ES ,Champion RN9YC,Torch F6RTC are replacement sparkplugs for Honda GCV 160 pressure washer engine. This info should be in your pressure washer engine manual. Check the attached links,instruction and guides, Good luck
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http://www.bsppwebtools.com/data/manuals/020296_0esAw.pdf
Troy Bilt 020296 Pressure Washer Relacement Parts
Spark plug cross reference

Could also be crack/leak in HP pump. If it were left in cold weather without antifreeze, I'd check there first. Part + labor might warrant new washer if more than a couple years old.
Sorry.

you move it in very small moves and be sure to mark the starting place

Carburetor float is stuck and flooding the engine.
Replace the carb.
STEP BY STEP HONDA GCV 160 CARBURETOR CLEANING THE CORRECT WAY

Your top seal on the mower motor is faulty...replace with new seal...

have you tried totally taking the gun apart

If when you take the High Pressure water hose off the pressure washer pump no water will come out they you may simple have the bypass valve stuck. You may need to just remove the outlet fitting and clean the bypass valve.
It would be helpful to know the model number of the pressure washer or the pump.

Your pressure relief valve may not be working. If that happens when you shut off your spray gun, then pump is dead heading, stopping the motor. If this is the case it stops dead, not coasting. Either replace the pressure adjusting relief valve or remove it, and disassemble it and clean it.

honda pressure washer ohv was running great died like someone turned of the switch ! has spark, oil full, sparkplug looks good any ideas please.

Hi , I think you need someone to remind you these engins are not made by god and they work by obeying three simple rules ,
1.Spark , Can you see a very good blue spark
2.compression,,can you feel strong compression ,
3.fuel , is the right amount of fuel getting in , is the air mixture good ,

Now try these things

Find the manual and PROPPER set the gap in the spark plug ,
clean and check the air filter ,
remove all fuel and replace with brand new,
check the fuel filter,even in the tank tap?
undo the screw at the carb bowl , can you see petrol leaking ,

If everything checks out then try this to get it started,,

spray "easystart" in the carb , bypassing the air filter ,
if it wants to start but cant for long then its a carb problem
check float hight , float needle,jets and pins ,too much air getting in

find someone thats good on motorbikes , They like me know all the tricks to get things to start ,