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5.0 Hp Honda motor for pressure washer . Will not start. pops threw carb. seems to have back pressure, without waterpump attatched.

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Assuming that it is turning over adequately by electric start, I would suggest that you look at the plugs. If they are dry, then you have a problem with fuel delivery. Spraying starting fluid into the carb intake should get a pop and a few turns out of the motor. If not, you likely have a spark or compression problem. Check for proper oil fill level. These motors won't start when low on oil. Each possibility has a long chain of test and repair procedures. If you can chase down a liikely cause I may be able to help you further.

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Dear LC39B,
Is it possible you are blaming the wrong part of the machine? Did you try the Honda Motor on its own? I am asking , because if the pump of the washer has some fault or a bit jammed, this will demand a lot of power from the Honda. You can try the Honda with no water connection and no gun.
Regarding the Honda motor, you should check the electrical system also. I am saying this because you did not mention it, in your service procedure.

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