Problem Cranking Power Washer..Tough Cord

I have a 6 horsepower (2350 psi) Craftsman power washer with a Briggs & Stratten engine. Its about 6 years old and has about 12 hours of use on it. Last year I had to dissassemble the carb in order to clean it out as it had been sitting for awhile and the float was stuck. After reassembling the carb, I was able to crank it up and I used it for about an hour. However, I noticed that it was more difficult to pull the cord to crank it than before...it was like, the force you experience on a mower when you don't grip the saftey latch when you crank...like the brake pads were engaged on the flywheel. However, the power washer has no such thing. Yesterday I got it out and tried to crank it and ended up hurting my shoulder trying to crank it. I've keep the oil at the right level and keep water running through as not to burn it up/over heat it. Does it sound like it has overheated anyway and bent the cam shaft, or something else? I haven't torn down the engine yet, but I wanted to get some ideas what it might be before I waste any more time with it. Thanks,
Wade
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you might try disconnecting the motor from the pump and try starting the motor. that way you would know if it is the motor or the pump causing the problem

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