Briggs does not start

[ka9bxg 3]

I have a model 19 engine that does not start.I just put it together and it will not start.I put in a new coil new points condensor checked the timing and still does not start.Lots of spark but will not fire even with putting gas down the spark plug hole.Yes I did change plugs and different kinds.I did have the piston out and yes there is good compression.Anybody have any ideas.This is not the first model 19 that I have worked on and all the others run well.Bob

[JonetteP 0]

Bob, you have probably already done this but I would check the camshaft for wear. Also, if the plunger has a grove in it it will cause the timing to change. Another thing to try is to prime the engine when you are rolling it over. It is possible to flood the engine through the spark plug hole if too much gas is put in. It relates back to fuel atomization. You need the right amount of fuel and air to ignite. Compression-fuel-Ignition Hope to hear of your success! Please tell us what you find, we have two model 19,s in our warehouse to get running!

[BigSix 0]

If you're still stymied, you might want to check that the flywheel is correctly keyed and seated on crank, i.e., that the flywheel isn't "out of phase" w/ crank, thereby mistiming your spark. If the keyway was bad or the Woodruff key was mis-sized/missing, this could happen, as has been noted in the older posts (by Smilin'Sam, for one, I believe..?) Peter

[geezer 0]

i had the same problem with my 12 hp briggs just to find out the gap was off .005 on the points. i rechecked them set them up right and started it and it runs great. mybe they are off just a tad.

[gr-made 0]

I have to agree with comment #1 that it is a timing issue. I had the same problem this summer rebuilding a briggs 10 hp. I found out after numerous unsuccesfull attempts to run that the timing was off. I guess that the last time the motor was rebuilt the person put some bogus timing mark on the cam. I found out I was 90 degrees out of time. After about the fourth time tearing it back apart I went through the four stages: intake,compression,power, and exhaust while turning over by hand. Only then did I find out the problem. Runs like a champ now. Best of luck. GR-Made

[StinKy 0]

After rebuilding my 23-D it would'nt fire. Cam & valves were fine and magneto was replaced. Still no fire. I loosened the flywheel and moved it off it's position called for in the book ever so slightly. It's been running fine ever since. The timing is retarded a degree or two, no way to tell for sure. Whatever it takes! Dick

[LogmanB 0]

Hey Bob. Timing is everything. A quick check for proper indexing between cam and crank should help. Remove the spark plug, and bring the piston up to top dead center. Then find a spot on the flywheel (grass screen will do)that is close to a fixed point, such as the shroud. With the piston at TDC, mark a line across the flywheel to your chosen fixed point. This will act as a crude timing mark. With the spark plug removed, roll the crank around until you feel the compression pulse. With the plug still out, conect it to the coil wire, and roll the crank around fast enough to get a spark. At the same time, possibly with help, feel for the compression pulse. Obviously, the spark should occur at the same time you feel the pulse. Good luck.logmanB