Jump to content

Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

  • Announcements

    • Kent

      Sign In or Password Problems?   10/09/2016

      If you can't Sign In, you need to reset your password.  Use the Forgot Your Password link at the bottom of the Sign In screen, and the site will send you an email to reset it. If you have an AOL email account, use the Contact Us link at the bottom of the screen -- AOL is intermittently blocking email from the site.
    • Kent

      Feedback Please!   10/28/2017

      See News and Announcements forum.
Sign in to follow this  
lbrod

Hard starting B/S 8hp.

Recommended Posts

lbrod
Hi.. I'm new to this group. I reciently burned up my old 8hp. B/S. on my Broadmoore 728. I bought a new short block and everything went well. The new one is made for the magnatron ignition and I installed one in it. The engine is VERY hard to start. I rebuilt the carburator and set everything to specs. Still VERY hard to start. Once it does start it runs very strong and idles exceptionally well. I checked for air leaks and double checked the flywheel clearences etc. I had a repair shop tell me the problem is the starter doesn't spin the flywheel fast enough to get a good spark. Is this true? I have a twin to this mower and it's 32 yrs old with the old points system. It doesn't even spin one revolution and it's running. What gives here?? Can anyone help me out on this one???? Is it better to go back to the point ignition? Thanks, Len

Share this post


Link to post
Share on other sites
HubbardRA
Magnetron ignitions require a somewhat higher starting rpm because the trigger is by charging of a small trigger coil, while the older point type system charges the primary coil and trips by points. I have noted this on my push mowers. With the points typ ignitions, I would only have to give one hard short pull on the cord to start. With the newer igintions, I have to make sure to pull steadily through the entire length of the pull cord to get the mower to start. It seem to take longer to build up the charge necessary to produce the first spark. All of my current tractor engines are set up with battery ignition, using points with an external coil. These setups make more spark at slow speeds, in fact, the slower, the better.

Share this post


Link to post
Share on other sites
mowerman1193
What type of system is this magnetron??I have a Broadmoor with the 8hp motor and the coil went south.I put some kind of electronic coil on it.I never had any problems with starting it.I dont think I have noticed any change from before to after.It always fires right up even in the winter.

Share this post


Link to post
Share on other sites
BLT
quote:
Originally posted by mowerman1193
What type of system is this magnetron??I have a Broadmoor with the 8hp motor and the coil went south.I put some kind of electronic coil on it.I never had any problems with starting it.I dont think I have noticed any change from before to after.It always fires right up even in the winter.
Magnetron is Briggs version of electronic ignition. It uses the standard magneto coil and and interfaces it with its own electronic triggering device. It been around for the last twenty years or so and for the most part reliable. Where practical I have all my Briggs engines converted over. All of my "trons" came out of junked out mass market mower engines of different horsepower sizes, IE free.

Share this post


Link to post
Share on other sites
mowerman1193
Well I guess mine must be a magnatron system too then.All I really know is the only thing it consisted of was the coil...It was also a Briggs & Stratton part as it was packed in a Briggs box.Its been a long time ago that I put it on and I could'nt remember what it was.I just know it works good and I want to put it on my other Broadmoor so I dont have to ever mess with the points...

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  

×