Question about Karcher 2500 PSI Pressure Washer
Hi I have a Honda 1600 psi pressure washer which starts just fine with the lance trigger pulled and will stay working as long as I keep the trigger pulled . On release the washer starts to sound like its labouring and then cuts out. It will restart immediately and keep going again until the trigger is let go again. Anybody any ideas thanks, BrianI have a similar problem but it is not the engine. It was checked out recently. When I pull the trigger on the wand it takes numerous tries until it starts and then everthing is fine until I release the trigger. Once I release the trigger I have to start over trying to get it to start again and so forth.
When you release the trigger the pressure inside the pump rises above
working pressure. Once it reaches a set control pressure (around 20%
higher than working pressure) a sprung loaded piston actuates a switch
thus stopping the machine.
The machine will stay switched OFF whilst the pressure is trapped
between the pump and the trigger gun valve.
Squeezing the trigger releases the trapped pressure and the control
piston returns to its resting position thus starting the machine. If a
leak forms somewhere in the sytem the trapped pressure will leak away.
The time taken for the pressure to leak away depends on the size of the
If the pressure is still full during normal use, your fault will lie in
the outlet manifold - replace.
Sometimes the leak can be from the inlet non-return valve or NRV which
is located in the inlet elbow as the water enters the pump. Check for
obvious leaks from the gun or hose connections.
Posted on Apr 23, 2009
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Posted on Jan 02, 2017
You most likely need to set your valve clearances. If it is hard to
pull over or the recoil snaps back after starting your valves need to
be set for sure. This may not be the entire problem but it is a good
start. Also change the spark plug, a bad plug will cause odd problems
and is too cheap not to eliminate as a source. In addition check your
fuel, pour a little out into a white container (I like spray paint can
caps for this) and look at the color. If it is yellow to orange it is
bad. You can pour it into you car, the car electronic sensors will
compinsate for it quality but a small engine can't. Use a NGK BP6ES or
10mm open end wrench
14mm open end wrench
1 long shaft screw driver or rod
1 spark plug socket and ratchet
Remove the spark plug and the valve cover. Pull the recoil over slowly until the intake valve opens (intake is closes to the carb and it will go down when it opens). Now put your long screwdrive down the spark plug hole. Slow pull the engine over until the screwdriver handle is at it highest point, this is top dead center. It may take a few attempts. Now check your valve clearance between the rockers and the top of the valve. The intake should be .006 and the exhaust .008, both can be +/- .001. To adjust: hold the large nut with the 14mm then loosen the small one with the 10mm. Lefty loosey. Now turn your large nut until you get the correct setting and then tighten the small one the lock it in. It may take a few attempts and alway reverify your setting after you lock it down. Once done, find top dead center again and reverify. Now your valves are set.
Posted on Mar 31, 2009
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