Beltzington
Platinum Member
Fuel, air and spark how hard could it be? Hoping someone has some experience with the Lawn-Boy 4600 Push mower, two-stroke, single cylinder.
I bought this new in 1982 and used it for 16-years and it ran before I put it in storage in 1998. A few weeks ago a was looking for a better solution than weed whacking a steep ditch and dug the mower out of the shed. Wouldn't start initially but I could get it to start with starting fluid but it will not continue to run. Unsurprisingly I found some cracked or disconnected fuel and vacuum lines which I fixed, pulled the carb and it seems in good condition but there is a throttle valve on the carb I do not fully understand how it should be adjusted. The mower has two engine speeds, rabbit and hare. The selection lever for these settings is connected to the throttle valve which basically is moved to wide-open on fast and partially closed for slow. The kicker is the throttle valve's exact position is determined by a wind vane and a spring, the wind vane is deflected when the engine is running by radial-impellers on top of the engine. It is really a simple design to automatically keep the engine speed constant under varying loads and my hat is off to the engineer who came up with this solution but I have no idea how to adjust it. When I had the carb off I found the spring was disconnected from the throttle valve so I reconnected it and stupidly "adjusted" the spring tension to open the valve wide open when set to rabbit, and now after putting it all back together I can't get it to start even with starting fluid.
I am guessing the valve might also operate as a choke for startup but I could sure use some help from someone whose knuckles don't hang as close to the ground as mine.
I bought this new in 1982 and used it for 16-years and it ran before I put it in storage in 1998. A few weeks ago a was looking for a better solution than weed whacking a steep ditch and dug the mower out of the shed. Wouldn't start initially but I could get it to start with starting fluid but it will not continue to run. Unsurprisingly I found some cracked or disconnected fuel and vacuum lines which I fixed, pulled the carb and it seems in good condition but there is a throttle valve on the carb I do not fully understand how it should be adjusted. The mower has two engine speeds, rabbit and hare. The selection lever for these settings is connected to the throttle valve which basically is moved to wide-open on fast and partially closed for slow. The kicker is the throttle valve's exact position is determined by a wind vane and a spring, the wind vane is deflected when the engine is running by radial-impellers on top of the engine. It is really a simple design to automatically keep the engine speed constant under varying loads and my hat is off to the engineer who came up with this solution but I have no idea how to adjust it. When I had the carb off I found the spring was disconnected from the throttle valve so I reconnected it and stupidly "adjusted" the spring tension to open the valve wide open when set to rabbit, and now after putting it all back together I can't get it to start even with starting fluid.
I am guessing the valve might also operate as a choke for startup but I could sure use some help from someone whose knuckles don't hang as close to the ground as mine.