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Hit & Miss Gas Engine Discussion

United 1 3/4 HP - Poor Spark


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  #1  
Old 09-19-2009, 09:37:36 AM
Jeff Bower Jeff Bower is offline
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Default United 1 3/4 HP - Poor Spark

Trying to get my United going this morning and while everything seems to be in place, I just can't get a pop. I double checked the mag timing and I am getting spark, but not much. Is there a way to boost the spark? I've seen mention on the board, but not sure if it applies. I put a few drops of oil in the mag holes.
Seems like it's getting fuel, but I'm still trying to sort out the choke feature. There is no plate to open or close, simply a rod that I can move up and down at the bottom of the mixer. Is that the choke? If so, how can I apply the choke and start it at the same time?
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Old 09-19-2009, 11:45:05 AM
M Raines M Raines is offline
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Default Re: United 1 3/4 HP - Poor Spark

Might try starting on battery and coil and switching to the mag. Mag may be a little weak. The low tension mags don't produce a big spark.
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Old 09-19-2009, 08:30:58 PM
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Tim B Tim B is online now
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Default Re: United 1 3/4 HP - Poor Spark

hey Jeff, nice engine. You should be able to push up on the spring loaded valve on the bottom of the mixer for a few seconds untill gas runs out. If it doesnt, well that's one of your problems. My United has a pretty good spark and you should too. Maybe your adjustments or you need a charge. Let me know if you need any pics or help, good luck! Tim
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Old 09-19-2009, 10:44:53 PM
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Neale Behm Neale Behm is offline
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Default Re: United 1 3/4 HP - Poor Spark

Using a battery and coil is a good way to rule out a problem with the igniter. If the ignitor isn't the problem I would start by removing the black rubber bushing that holds the terminal in the end of the magneto. Clean the inside end of the brass screw with a good solvent and also the spring loaded contact inside the magneto.
If this doesn't help you may want to disassemble the magneto and clean the bearings thoroughly. Be VERY conservative when oiling the magneto bearings.
Be sure to let us know what you find!
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Old 09-20-2009, 09:38:43 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: United 1 3/4 HP - Poor Spark

Whatever you do, DO NOT connect the battery and magneto to the same post. You will fry the mag coils! Also note - an igniter set for mag operation is usually closed, and a coil igniter is usually open. If yiou use a battery and coil on a mag igniter, be sure to stay with the engine, in case it quits. If it does, chances are that it will stop points closed, which will burn out the coil in short order. Once started, you can disconnect the battery and hook on the mag wire, to see if the mag can power the engine once running. If it can, either you cannot spin the engine fast enough to get initial spark, or the magnets are weak. As a quick test, if the engine runs on battery and coil, take the lead wire from the mag, and strike it against a good ground. You should get a good flash from the contact as it is dragged over a good ground.
Andrew
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