Tractor is a 1997 with 650 hours. It has the FD620 Kawasaki, a twin 20 HP liquid cool. Over the years it has always run rough in hot weather, but always starts right up when engine is cold. Never a problem with winter snowblowing.
Here is a copy of a thread I made a few years ago.
((Always runs great when first started, but last summer, it would tend to run rough after mowing for 1 hour. I only noticed this after turning the deck off and lower the rpm to drive the tractor back into the barn. This spring I noticed it again. So I then looked at the valve clearance, only had to adjust 1 valve on 1 cylinder (plastic cam gear was changed at the 400 hr mark, valves adjusted then along with new coils). Then 3 weeks ago it would run rough even at full throttle. It acted like it was starving for fuel. (I was barely able to get it back to the barn, immediately checked the spark and it was good for both plugs, waited 30 minutes and then started it and finished mowing).
About 4 years ago it had a similar situation during warm operation, took it to a dealership, they changed the electrical fuel solenoid that is on the carb. That was the fix then, so I bought another one this month, installed, but after 2 mowings, the rough running is back during low rpm. If I remove the gas cap, no improvement. During the rough idle/low rpm, there are some poofs of black smoke. If I pull the choke out I can make the engine stall. When the choke is in, the choke plate appears vertical.
When the tractor is used in the winter for snow blowing, always runs great. To me, it has something to do with temperature, and maybe a too rich condition. Maybe the carb should be overhauled? Looking for advice!!))
Now I will add this: The igniter was replaced about a month ago, problem is still present.
Maybe now I should tear apart the carb? I am under the impression that there is no carb rebuild kit. So should I first tear the carb apart and then decide what to order? Has anyone had success rebuilding these carbs
Here is a copy of a thread I made a few years ago.
((Always runs great when first started, but last summer, it would tend to run rough after mowing for 1 hour. I only noticed this after turning the deck off and lower the rpm to drive the tractor back into the barn. This spring I noticed it again. So I then looked at the valve clearance, only had to adjust 1 valve on 1 cylinder (plastic cam gear was changed at the 400 hr mark, valves adjusted then along with new coils). Then 3 weeks ago it would run rough even at full throttle. It acted like it was starving for fuel. (I was barely able to get it back to the barn, immediately checked the spark and it was good for both plugs, waited 30 minutes and then started it and finished mowing).
About 4 years ago it had a similar situation during warm operation, took it to a dealership, they changed the electrical fuel solenoid that is on the carb. That was the fix then, so I bought another one this month, installed, but after 2 mowings, the rough running is back during low rpm. If I remove the gas cap, no improvement. During the rough idle/low rpm, there are some poofs of black smoke. If I pull the choke out I can make the engine stall. When the choke is in, the choke plate appears vertical.
When the tractor is used in the winter for snow blowing, always runs great. To me, it has something to do with temperature, and maybe a too rich condition. Maybe the carb should be overhauled? Looking for advice!!))
Now I will add this: The igniter was replaced about a month ago, problem is still present.
Maybe now I should tear apart the carb? I am under the impression that there is no carb rebuild kit. So should I first tear the carb apart and then decide what to order? Has anyone had success rebuilding these carbs
