model: 31707, type: 0230E1 ,code: XXXXXXX
The throttle butterfly is closed there is a gap between the adjustment screw and the lever. Starts easy, runs about half throttle when the butterfly is closed. can be Accelerated to full throttle without hesitation. I am used to working on engines but this has me stumped. Rebuilt carb....If I force the butterfly closed the engine will slow down a bit but opening up a little and the engine speed increases. What I was saying about cutting grass is that when I put a load on the engine such as when I engaged the blades the motor slowed a little bit so I open the throttle a little bit..increasing rpms and I was able to cut grass with the machine. I was thinking in respect to an air leak and a lean mixture....
no the condition existed before. The linkage is correct and set according to the service manual for the engine. Including the governor setting. Everything has been done since. Check the float for seepage inside since it was plastic and clear it was easy.Seat is set to the same depth. There's no setting.
yes I guess you could it that...about half throttle.
the butterfly is stopped by the sides of the venturi. I checked to see if it was centered correctly and it is. What I can do is jam it by twisting the butterfly shaft and that action will reduce the engines rpms a little but not to idle. Letting it go so it returns tits normal resting spot against the sides of the the motor dramatically increases rpms. But the butterfly is closed. There is no opening visible. I understand gas fuel mixtures.I just cannot find where the intake could create such a high vacuum situation to pull the fuel out with the butterfly closed. Looking for vacuum leaks I sprayed some carb cleaner around the carb and intake but it didnt reduce or increase rpms. I disconnected the breather tube from the carb and that didnt change anything. The only things I haven't done is checked the the key on the magneto and the valve clearance settings. I was thinking about replacing the float anyway thinking it may getting a little gas inside and running a little richer mixture than it should be.
yes, I already tried that. I checked with the service manual to see if it was installed correctly and it is. The problem defys logic. I checked the mag and set the gap using brass feeler gauges according to the service manual.It is as if the engine was built to run at half throttle as the norm.
I will have see if I can measure the rpms. Meanwhile I will remove the intake ,cjeck yhe carb with a magnifying glass and look for cracks,warpage ect.