Low pressure starts fine and runs ok but when you pull the lever there is no pressure

Your problem is your carburetor. You will have to remove the carburetor and service it.

Go on you tube .com search " how to clean a 4 cycle carburetor"

Once you do this your unit should start fine.

Always depress the lever on the wand whengine starting a pressure washer... then pull the rope... makes life a ton easier

Does this behavior change if the engine is warm and on minimum choke? Do you get any water spray before the engine quits? Carburetor could be dirty or float stuck. Try putting dose of carburetor cleaner through engine and cycle choke lever and engine speed lever back and forth while engine is running after it has warmed up without running water spray. See owners manual.

It isnt very clear your explanation of the problem but what type washer do you have first? It sounds like you have a bad unloader or need a new variable nozzle tip. Can you explain in more clear detail. Thanks

Check oil if ok then observe, engine noisy? Clanking? If so you need to pull oil pressure switch and take manual reading with oil pressure gauge. If engine is running fine with no irregular noises Probly changing oil pressure switch wouldn't be a bad idea.

I have seen it before where the little plastic pistons overheat and melt. The unit still runs but with no pressure. I would pull the pump apart and check the pistons.

The pilot valve controls the pressure, idles the engine when set pressure is obtained and releases compressed air thru small vent while the engine is idling. If the idle is set too low, the engine may stall. Try increasing idle speed and make sure that when set pressure is reached that air is venting from pilot muffler vent. The pilot valve can be easily tested. With engine off and pressure in tank, flip the pilot valve start lever up then down. When flipped up, the throttle control shuld activate idle and the pull rope should be easy to pull. With lever down, throttle is pulled on engine and compressor is loaded making the rope very difficult to pull. If the engine stalls with air in the tank flip lever up to easily start engine then down to pump. Good holidays

HELLO THERE:
Here is some troubleshooting tips for you and a web link for you ok this should help
best regards michael
Troubleshooting Your Pressure Washer General points to check if a problem occurs

• Are the engine and fuel switches in the “ON” position?
• When troubleshooting, always check oil and gas levels.
• The oil for the pump is a 30W non-detergent mineral oil. Do Not fill over halfway on the sight glass.
• Is the water tap open?
• Check the choke and throttle levers.
• Is the correct nozzle in the lance? Is the nozzle plugged?
• Only the black nozzle is for soaping at low pressure.
• Is the water-inlet screen clogged?
• Hold the gun trigger open while pull starting the engine.
• Check for O-rings in the lance and quick couplers.
• Has the unit tipped over? Close the fuel switch and keep pull starting the engine until the excess fuel is burnt up, then open the fuel valve and try again. Some engines will need to be primed every time they are started.
• Make sure the engine is turned off after each use. It should not be left running without use for longer than 2 minutes as the pump can overheat.

Are you experiencing low pressure?

• Is there an air leak?
• Dirty pump valves?
• Check for worn pump valves or broken valve springs.
• Check for a worn out spray nozzle.
• Check for leaks in your plumping or hoses.
• Troubleshoot your nozzle, is it turned to the highest pressure setting?
• Is the unloader improperly set?
• Are the engine RPMs too low?
• Check if your water supply is sufficient.
• Check if your engine is getting enough power.

Trouble with high vibrations

• Dirty pump valves?
• Do you have a sufficient water supply?
• Is there are in your water supply?
• Is the inlet water filter clogged?
• Clogged or damaged spray nozzle?
• Make sure it has the correct fuel
• Has the choke been left on after the engine has warmed up?

If the engine won’t start

• When troubleshooting the engine, check if it's low on fuel or oil?
• Worn or dirty spark plugs?
• Is the switch in the off position?
• Is the fuel valve in the off position?
• Is the engine flooded from over choking?
• When cold starting, was the engine properly choked?

If the starter is hard to pull

• Low oil in the crankcase or pump assembly.
• Oil or fuel in cylinders (hydro locked).
• Pressure built up in the system, relieve this by squeezing the trigger.

hold in the lever while you open the bleed nipple let out the air & fluid & close nipple quickly b4 releasing the lever!!!
now let the lever come back & do it all again keep repeating the process until you have only fluid coming out of the nipple!
& dont let the fluid get tooo low in the reservoir!!!!!!
it helps if you put a clear peice of tubing over the nipple & the other end in a glass jar with fluid in it so that air cant get back up the tubing!!!!
you can buy a kit at most auto stores! [ single bleeding kit]
when no air in system close nipple pump lever ti build up pressure
the open nipple & close it again quickly!
let thhe lever back & let it rest so the rber inside can regain its seling capacity!
you may need a few tries ta this part! [pressure bleeding]
then it should be fine! if not try pressure bleeding from the start!
but dont agitate the fluid as it creates mor air bubbles!
ok good luck
cheers rob

Several things can cause the problem. First, spring for a new spark plug. The stock plug is NGK CR8E. Now the plug is eliminated as a problem. Next, pull the slide out of the throat of the carb. Now remove the jet needle. Put the needle clip on the 4th notch, (this is the stock setting). Use only premium gas. Next, follow the starting instructions below.

There is a proper way to start the engine. Four controls are on your bike to assist in starting.

• The choke, used when the engine is cold. Pull the red knob for choke.
• The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
• The de-compression lever, always used.
• The throttle, used to prime the cylinder.

Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. Release the de-compression lever and give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from a backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery and clean air filter will also aid in starting.

This will likely tame the beast for you. Please rate this answer. Thanks!

Hi Koorong,
It seems you may have refitted it incorrectly the system,especially the springs !, the round ones or the center inside clutch lifter pin which whn operated does not push to lift the pressure ring.
I am not tht experinced withthe duccati but i guess the clutch systems works on the same principles.



Knight ( Yamaha Seca XJ750R 1981)