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My Countax C600H garden tractor is losing power. Can you suggest a solution. Many thanks, humemacdonald

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Hi and welcome to FixYa, I am Kelly.
This garden tractor came with 2 different engines. The 16 HP Honda and the 603 cc Kawasaki V-Twin. I do not know which one you have and the characteristics of each engine varies widely. I can help you but need to know which engine you have please. As far as losing power there are 2 main reasons an engine loses power. The first being fuel starvation from debris in the carb. float bowl and the second being worn valves and valve seats. More than 80% of the time it is a fuel related problem.
Turn off the fuel, remove the float bowl clean out the debris. Disconnect the fuel hose at the carb and check fuel flow to the carb. Things like fuel filters and tank exit ports can clog restricting fuel flow also. Using a spray can lid to catch fuel under the removed float bowl area the fuel flow with the gas momentarily on should fill the cap in around 8 seconds. If fuel flow is any less than that you need to find out why and locate the restriction. It can be in the needle / float valve area, carb manifold or before the carb. On the Kawasaki engine it can even be the fuel pump that is not working properly from a cracked rubber hose or a failed fuel pump.
If you can locate your COMPLETE engine number and post it here I can help you with some "how to" information that is ENGINE specific.
If there is a valve / valve seat problem your engine compression will be 110 PSI or less and will be very hard to start. Also you may note engine backfires during starting. Should you discover that you have low compression the fix is usually removal of the engine cylinder head(s), disconnecting the valve springs and hand lapping the valves and valve seats with coarse and fine valve grinding compound.
If you have the Kawasaki engine I can probably find an on line "Service manual" for your engine. A Honda engine on the other hand I do not have access to the service manual but the mechanical steps are very similar.
I am sure you have already replaced the spark plugs but... even something as simple as ONE bad spark plug and degrade engine performance drastically when under load.
Lastly... make sure the carb is not loose on the intake mount and that there are no vacuum leaks.
Thanks for choosing FixYa,

Posted on Mar 14, 2011

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