Stepney 2,351 #1 Posted June 9, 2013 Hello all, Well, the B-100 is letting me down (Again), it ran fine for the first few weeks of work. Well, I talked father into getting rid of the Scrapsman mower he had... To get an older one... Anyway, now the B-100 might make it for fifteen minutes, then BANG! and it'll die. I just rebuilt the carb, that was the last issue, fixed some electrical, still not it... What else could be wrong? It sounds like it looses spark. Thing is, now all we have is a little push mower... And... Well, he's not too happy. Do you have any ideas what could be wrong now? Spenser. Share this post Link to post Share on other sites
WH nut 553 #2 Posted June 9, 2013 Are you sure its losing spark. We need to know to be able to start trouble shooting Share this post Link to post Share on other sites
rmaynard 15,934 #3 Posted June 9, 2013 (edited) ...might make it for fifteen minutes, then BANG! and it'll die... So when it goes BANG and dies, can you restart it again? Is the bang a back-fire? Edited June 9, 2013 by rmaynard Share this post Link to post Share on other sites
Stepney 2,351 #4 Posted June 10, 2013 Yep, it'll take right off... I just did some electrical work to it a few weeks back. Sometimes it'll run an hour, other times wont move five feet. I'm beginning to think it could be the coil, maybe tomorrow I'll try another one out. That and I'll try the condenser. Share this post Link to post Share on other sites
WH nut 553 #5 Posted June 10, 2013 Condensor is a good idea, and you do have the points and condensor on the neg side dont you? Share this post Link to post Share on other sites
Jeff-C175 7,203 #7 Posted June 10, 2013 then BANG! and it'll die. Please clarify... Does it actually go BANG! ? I mean, does it make a bang sound? Or was that just a figure of speech, as in, it just suddenly stops running? Share this post Link to post Share on other sites
Stepney 2,351 #8 Posted June 10, 2013 Sorry, Guess I was in a bit of a fast paced mood yesterday... Yes, it'll suddenly start to backfire, as if there were firecrackers in the exhaust, or as if the key was being rapidly turned on and off, and it simply coasts to a stop. Sometimes if I close the choke it'll run anther minute or so. A few months back it did the same thing, and I found the ground wire terminal loose from the wire. Then it did it again, and the tank was sitting too close to the hood, and was closing off the air vent in the cap. It ran half decent for another week before catching fire on the front yard due to the carb float leaking and starting to pump gas straight out the air filter... That happens to me rather often, Is that a common problem? Going to mess with it again today, tell 'ya if I get it right (Again). Spenser. P.S., Sorry for the misleading first post. Matter of fact, I'll try and get a video of it happening. Share this post Link to post Share on other sites
Jeff-C175 7,203 #9 Posted June 10, 2013 before catching fire on the front yard due to the carb float leaking and starting to pump gas straight out the air filter... That happens to me rather often, Is that a common problem? You may have more than one problem, but it would seem that the first one to approach would be having the carburetor rebuilt. This may be the only problem... or perhaps you have a sticking exhaust valve causing the backfiring... Share this post Link to post Share on other sites
meadowfield 2,655 #10 Posted June 10, 2013 sounds like a fuel problem - clean the carb, check the fuel pump - I've had both problems in the last few months. Share this post Link to post Share on other sites
Stepney 2,351 #11 Posted June 10, 2013 I had just rebuilt the carb yesterday, and it ran for about five minutes, then died again. I'll try the exhaust valve. Maybe it got carbon-ed up... Share this post Link to post Share on other sites
rmaynard 15,934 #12 Posted June 10, 2013 How did you "rebuild" the carburetor? Just installing a new kit is not a rebuild. All air/fuel adjusters, float valve/seat, gaskets, and anything else that can be removed, should be. Then it needs to be soaked overnight in something like Berryman's carburetor cleaner. The main air/fuel adjuster, which is the long brass spring-loaded screw on the top, needs to not only be cleaned on it's outside, but all the tiny little holes need to be open, and you must be able to pass air through the entire length of the inside of the tube. Check the throttle shaft for play. If you have too much side to side movement, you may need to install a bushing kit. Once you are certain that everything is cleaned properly, put it back together, make the coarse adjustments as indicated in the book, and try it again. While you have the carburetor off, it's a good time to re-check the valve gaps. Share this post Link to post Share on other sites
Fordiesel69 267 #13 Posted June 11, 2013 How about a video? We can help you pinpoint the problem better. I would not mess with the exhaust valve. It is for sure not the problem. You have some kind of fuel related problem, or an ignition system problem. Share this post Link to post Share on other sites
Stepney 2,351 #14 Posted June 20, 2013 Sorry it took me so long, but I got it! I was pumping fuel at idle speed, but if I increased, I'd loose it, even if I slowed it. I tore the pump down and found what looked to be two pieces of red colored wood, or maybe plastic from the tank??? Anyway, each was jammed in a valve on the pump. It now runs fine! I added a filter on the line. Thanks for all you're help! Spenser. Share this post Link to post Share on other sites
