Jubilee Won't Stay Running

Morning friends. I need some help with my Jubilee. I was using it and all of a sudden it quit I tried to restart it and if I kept pulling the choke in and out I could get it to start up and run for a second but would die again. It was puffing black smoke so I thought it was the carb. So I ordered a kit rebuilt it and it still does the same thing when I start it up. I tried changing the adjustments but nothing worked. Can any of you guys tell me what I need to look at to see what is wrong with it? I replaced the gas tank and all of the lines not to long ago and have used it quite a bit after that with no problems until now. Any help would be greatly appreciated. Thanks.
 

Is it getting good fuel flow? Pull plug on bottom of carb to check this. Is your air cleaner restricted? Remove from carb inlet and crank engine to check. Does it have good blue spark that will jump at least a quarter of an inch? Remove plug wire, hold away from good ground and crank. Does it have a vacuum leak? Spray combustible aerosol around intake manifold to head and manifold to carb connections while cranking.
 

Another thought. Did you clean the carb thoroughly when you kitted it? By this, I mean did you soak it in carb cleaner then wash it out, blow dry it and blow all the orifices out? If not you may need to redo it.
 
Thanks for the reply Mr. Larry. Yes I cleaned it real good with carb cleaner and used small picks and torch cleaners to clean the small holes and blew lots of compressed air into it. I haven't checked the spark or for leaks. I'll check that this week.
 
One should always trouble shoot before parts or you can ad problems instead of fix them.

#1 you need to check and make sure you have a good blue/white spark that will jump a 1/4 inch gap or more. Do this one first always so as not to start a fire

#2 check for a good gas flow. Pull the carb drain plug and make sure you have a good steady flow of gas that will fill a pint jar in under 3 minutes.

#3 check and service the air cleaner. The air cleaner is one thing that gets forgotten way to much
 
but did you check flow of fuel.. I havn't seen where you said you did.

PS.. the first thing you ALWAYS check is spark. it's free and easy. check it right at stall before you start messing with fuel.
 
I had a similar problem with my 850. Would start and blubber but then die. I checked everything a jillion times, rebuilt the carb twice, bought a new Zenith carb, replaced points/condenser/rotor/cap checked timing, etc. Nothing. I could get a spark 5/16" long while cranking. Spent 1-1/2 years banging my head on anything I could find. Finally got it to run long enough to get a timing light on it. Low and behold, timing light indicated no spark after it first started. The problem was my brand new coil breaking down under load as the centrifugal advance kicked in. Never checked that since the coil was brand new. Replaced the coil and it runs like a top.

I know this is a "I ain't never seen anything like that before" problem but it happened to me. If all other things fail, try another coil. I know you can end up with a lot of spare parts this way, but I almost have enough to build another engine after a 1-1/2 years.
 

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