When the lever is placed in the 'choke' mode, the choke does not close all the way. There is a spring that pulls the choke closed. The bottom part of the spring that connects to the choke lever connects to a plastic piece and sits in a notch rather than a hole that the spring wire would go through. Does anyone have a picture of this installed spring. This issue just cropped up. Not sure if a piece broke off the where the spring connects. The mower has run flawlessly for almost 30 years. Thank you for your help.
chokes are always spring loaded to open not to close
If there are 2 holes on the choke control plate on the top of the carb, shift it to the other side
There are two levers on the handle of the mower. The gearshift handle and the throttle handle. To start with, I removed the spring. It appeared that the coils of the spring was rubbing against this plastic piece on the choke shaft. (I'll see if I can take a picture of the carb and choke). The throttle handle has three positions: slow, fast and choke. When the throttle is in the fast position with the spring removed, the choke is forced open all the way by the throttle linkage. The choke plate is not free to move by hand at this point. When the throttle lever is in the choke position, the choke plate is free to move by hand all the way to the close position and back to about 50% open. On this mower, the choke has to be 100% closed for the engine to start on a couple of pulls. The only way that can happen is if the spring pulls the choke closed. However, the choke is not closing on it's own. I can push lightly on it and it will close. When I place the lever in the 'fast' position, the choke will be 100% open. This mower has never been in the shop in 30 years. Never had a problem with starting. Never had the need to even look closely at the carb.Did not even know there was a spring on the choke plate assembly. I have replaced the pull-start assembly once but never had an issue with the carb. I need to see an actual B&S engine or a picture of one showing the choke assembly with the spring. I have a couple of new springs ordered. Will be in touch.
Either finger move the choke plate at the linkage connection or remove carb. Look inside carb body at choke plate. Should have full open and closed positions. If you have binding you will have to pull the shaft out and polish it up till she moves free.
The choke and shaft are free with the spring (618) removed. The new springs (I ordered 2) should be here 7/13/22. I'll try it again. The mower was drained of oil and gas last week and power washed. It's pretty clean. Yeah, this things amazing when it runs. Usually starts up on the second pull. I'll keep looking for a picture of the spring install but I know where I removed it from. Maybe it got stretched too far over time. I'll report back after I install the new one. Thank you all for the help.
ctg
#9
Fish
Looking at that model number parts lists, makes it look like your carb does not have a choke. Or am I mistaken?
#10
Fish
No, I see the other carb, here is a better pic of the choke.
Is this it?
#11
Fish
The choke plates sometimes get shifted out of place, and it won't allow the choke to fully close.
It has a choke. It looks like what I have. The large plastic part on the left is external to the carb. The long end of the spring connects to a notch at the bottom of the wide end. You can see a little protrusion there. It's a notch in the plastic. The coil end of the spring connects to the control brackets right above the carb. That's where I took the spring off of.The choke plate is not shown in the picture. It attaches to the choke shaft. The choke on the mower is free to move without the spring. Not binding at all. I'll know more by Thursday. Thanks for the help.
Thanks for the videos they were interesting. I should get the new choke return spring today and I'll take a look to see if it needs additional cleaning but it was power washed last week after the oil and fuel were drained out. I'll see if I can get a good picture after I get the spring installed.
Good morning. I'm happy to report that I installed the new choke return spring and adjusted the throttle cable and the choke closes normally when the start lever is in the choke position. Comparing the old spring to the replacement it was obvious the old spring had lost its tension and the part of the upper coil was binding on the choke shaft extension where the straight part of the spring connects to. The machine now starts on the second pull. I have to say that it's not a real high-tech solution for John Deere to close the choke but it was 1993.
