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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / June 2006Lawnmower engine question - nasty kickback when starting
I've got an MTD mower w/ a Briggs and Stratton engine on it. The thing, however is really unsafe in that it kicks back aggressively when I try to start it. It will rip the starter cord from my hand with ease. I don't see any way to adjust the ignition timing. Wondered if anyone here had any thoughts? I now have a new mower, and if there isn't an easy fix I'm going to trash the old one, but if I could eliminate the kickback then I'd feel ok putting it out for a garage sale and not feel bad about it. As it stands now, it's dangerous. Thanks, Gary Pull the flywheel and replace the key, sounds like it is partially sheared. About a 20 cent part.  SignatureSteve W. Life is not like a box of chocolates it's more like a jar of jalapenos- what you do today could burn your a.s tomorrow! > I've got an MTD mower w/ a Briggs and Stratton engine on it. The thing, > however is really unsafe in that it kicks back aggressively when I try [quoted text clipped - 8 lines] > > Gary What Steve said. happens quite frequently if you have a yard that has a lot of rocks, stumps, debris, etc. in it. nate > Pull the flywheel and replace the key, sounds like it is partially > sheared. About a 20 cent part. [quoted text clipped - 23 lines] > http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups > ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- > What Steve said. happens quite frequently if you have a yard that has > a lot of rocks, stumps, debris, etc. in it. > > nate This is the most common problem. Some of them had 'somewhat' adjustable timing, but I too believe that a damaged woodruff key is the most likely issue. I have a Briggs and Stratton service manual for a number of the engines. If you need further info, give me your model number and Ill take a look. >I've got an MTD mower w/ a Briggs and Stratton engine on it. The thing, >however is really unsafe in that it kicks back aggressively when I try [quoted text clipped - 8 lines] > >Gary Replace the flywheel key. It can/will do this - or not even run - with the key almost imperceptably offset. You should keep several keys on hand if you can afford less than a quarter each. It saves the aggravation of going after a new one. There are several net site with an exploded view so youcan see it. There may also be good service instructions. It really is a simple service procedure. Lugnut I'll take a look see about pulling the flywheel this afternoon. Before I got the mower, someone else had pranged the blade pretty good and I'd replaced it and early on this issue with the backfiring was minimal so I'd forgotten about it the original blade - Never realized that the flywheel could move without coming completely loose. Many thanks to all who responded! > I'll take a look see about pulling the flywheel this afternoon. Before > I got the mower, someone else had pranged the blade pretty good and I'd > replaced it and early on this issue with the backfiring was minimal so > I'd forgotten about it the original blade - Never realized that the > flywheel could move without coming completely loose. It is designed to spin on the end of the crank. This prevents the crankshaft from being damaged by the torque of the flywheel when it is suddenly stopped by running it into a an immovable object. Do not replace the soft metal key with a steel one or the next time you run into that tree stump it will be the last. -Jim >I'll take a look see about pulling the flywheel this afternoon. Before >I got the mower, someone else had pranged the blade pretty good and I'd >replaced it and early on this issue with the backfiring was minimal so >I'd forgotten about it the original blade - Never realized that the >flywheel could move without coming completely loose. Many thanks to all >who responded! Sounds like the problem started when the blade got bent which is common. Be sure you only use an aluminum key designed for the Briggs. It is intended to shear instead of holding all the energy which can/will damage the crank. Lugnut Exactly what had happened. Took a while to get the flywheel off, but it was off about 90 degrees with the key sheared. Replaced it with a Briggs key and it runs like a top on the first pull. Again, many thanks! |
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