B&S engine will not restart (Toro Recycler push mower)

[Carscw]

Ok my turn. First it's not the gas because it runs fine. Here is the real deal. Put your spark plug wrench in your pocket. Go cut some grass as soon as it shuts off check for spark . If the engine does not shut off when your mowing and only will not restart after you shut it off then I would rebuild the carb. I will apologize that these two can not get along long enough to give you a straight answer.

 

[Fish]

The carb on his series has no choke, but needs the primer to start, so after 10 minutes, his primer stops working.... Well...

Then you all may have something...... Or it could be that coil..... Or that "free valve gap check". If that passed the test, then he could go shopping for coils and floats and carb kits......

 

[Fish]

So since the mower starts normally cold, that must mean that his primer bulb must be working OK......

Follow me here.... If he runs the mower and shuts it off after 15 minutes........ And it will not restart?????

One possibility, is that he still has last fall/winter's fuel in it, so after a few false restarts, the new fuel will get through the system....

Another possibility is that the valve gap is real close, and an adjustment may be in order, and checking such will cost nothing...

 

[Fish]

So if one shut the engine down, and it wouldn't restart.... What is then the problem???? If the primer bulb works fine????
It stops working fine after 15 minutes????

If it was a fuel problem, then a couple of squirts from a good primer, the engine should whirr great for a few seconds before dying.........

but obviously there is another problem....

 

[Rivets]

Carscw, didn't I say the same thing you said in post #2 & #7. Don't have to apologize for me as I must be doing it right if I tell the guy to do the same as you tell him. I even told him to PM me if he wanted a procedure to rebuild his carb. It is Fish who is stirring the pot and adding confusing posts. Who is this guy supposed to listen to?

 

[SMWoody]

Carscw, didn't I say the same thing you said in post #2 & #7. Don't have to apologize for me as I must be doing it right if I tell the guy to do the same as you tell him. I even told him to PM me if he wanted a procedure to rebuild his carb. It is Fish who is stirring the pot and adding confusing posts. Who is this guy supposed to listen to?

OK - here's more of the details; when I attempt to start this mower (cold), it starts on the first pull - I forgot to mention, this does not have a primer bulb or a manual choke or a throttle control. I believe I could mow for an hour and it works just super (as long as I don't shut it off). When I shut it off (to rest, or empty the grass bag or whatever), it will not start; and I've checked for spark and there is spark (just won't start). And I took the gas tank off, drained the gas, cleaned the tank out with water and dish soap, rinsed very well and made sure that it was as dry as a bone inside the tank. Changed the oil, replaced the air filter, sharpened the blade and cleaned it up really pretty, this was about a month ago. This starting problem has been happening for the last several years; I was gonna take it back to where I got it but never got around to it. So I've been doing this small engine mechanic hobby for over a year now and am learning lots of things..... I guess the next thing I'll do is see what it takes to check the valve clearance, gap or whatever the term is...... I'll keep monitoring this thread to see what else ya'll can think of - thanks so much....

 

[Fish]

OK - here's more of the details; when I attempt to start this mower (cold), it starts on the first pull - I forgot to mention, this does not have a primer bulb or a manual choke or a throttle control.

Wow, that sounds real interesting!!!

 

[Fish]

Nahh, this thread is too bogus.....

 

[pugaltitude]

OK - here's more of the details; when I attempt to start this mower (cold), it starts on the first pull - I forgot to mention, this does not have a primer bulb or a manual choke or a throttle control. I believe I could mow for an hour and it works just super (as long as I don't shut it off). When I shut it off (to rest, or empty the grass bag or whatever), it will not start; and I've checked for spark and there is spark (just won't start). And I took the gas tank off, drained the gas, cleaned the tank out with water and dish soap, rinsed very well and made sure that it was as dry as a bone inside the tank. Changed the oil, replaced the air filter, sharpened the blade and cleaned it up really pretty, this was about a month ago. This starting problem has been happening for the last several years; I was gonna take it back to where I got it but never got around to it. So I've been doing this small engine mechanic hobby for over a year now and am learning lots of things..... I guess the next thing I'll do is see what it takes to check the valve clearance, gap or whatever the term is...... I'll keep monitoring this thread to see what else ya'll can think of - thanks so much....

Your problem sounds like the Thermostat is not adjusted properly for the auto choke.
It could be adjusted wrong which is either too much choke when warm or not enough choke when cooling down.

Also how did you check spark?

9 out 10 times its the metal spark plug cap breaking down due to heat.

 

[rggpa4]

My B&S 6 hp (prime and start) on a Snapper 21" just started doing this. I installed new carb last fall, used many times since, ran dry before winter, always fresh fuel with B&S stabilizer added. Plug looks fine. Starts on 1 pull, runs fine for 45 min - 1 hr, then starts to stumble intermittently before stopping. Starts easily after 1/2 hour wait. If I stop while still running great, it will almost start, but after a few attempts, no sign of starting. Wait half hour, ready to go... Based on this thread, I should check for spark when hot (coil) and/or adjust valves. Is it possible that this is a air leak and that tightening the carb mounts might be needed? W/o taking the covers off, the carb seems tight, but easy task to retighten all bolts. Although this seems just like the issue that started this thread, no one has mentioned the intermittent stumble before stopping. I'm leaning toward the coil starting to fail..... Altho the metal cap on plug wire sounds possible (9 out of 10 times = pretty high odds).