Champion 50 mower keeps cutting off

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my mower start and cuts short grass without any issues. however, as soon as it hit long grass it cuts off. any idea why?
 

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It's a 5hp mower so it shouldn't have too many problems....however, clean the air filter (or run the machine without it for a test).
Has the machine been serviced at all? It may need a fuel filter (if applicable) or a carburettor clean.
John :)
 
I run it without the air filter but still the same. however when it start now it has no power at all, see attached
 

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Thanks, I got that one....
It's not a happy engine, is it - too much mechanical clatter in there. How about taking the valve cover off (4 bolts) and checking the valve clearances?
John :)
 
How about taking the valve cover off (4 bolts) and checking the valve clearances?
John :)
attached a photo of the valves. what I am supposed to look at. both plates going across have clearance. shall I tightened the blot of untightened
 
sorry for got yo attach the photo, here it is
 

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Turn the engine slowly by hand, in the direction it's supposed to spin and you'll see the valves opening and closing.
When each valve closes, the rocker should come slack.....that's the arm between the push rod and the valve top.
Ideally use a 5 thou feeler gauge between the rocker and the valve when the valve is fully shut - the gauge should just slide in. If you don't possess a feeler then you should just be able to detect some clearance between the two.
If you're happy with this then pop the cover back on.
John :)
 
I really don't like the sound of this engine.....you don't have the choke on there, do you?
It sounds like it is chuffing air when it shouldn't....is anything slack on the motor?
John :)
 

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