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Reload this Page Cub 127 engine swapped had spark now I dont ?
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Old 05-27-2019, 11:07 PM
Marinemp Marinemp is offline
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Default Cub 127 engine swapped had spark now I dont ?
Just pulled the motor out of the donor 125 to put in my 127. I got the motor in test fired it and it seemed like it had a miss or timing. It was weird just not running right ya know. I figured maybe I had the coil wires backwards. I swapped them and put the 12v heading towards the point and tried to start it. Now I have no spark, could I have fried the points ? I know nothing about ignition other than I need spark.

lol.
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Old 05-28-2019, 06:15 AM
dale c. dale c. is offline
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the 12 v wire hooks to the + side of the coil , the points wire and the condenser hook to the - side of coil .. after that clean the points with emery cloth or sand paper set gap at .020 hopefully that will get it going
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Old 05-28-2019, 02:47 PM
Marinemp Marinemp is offline
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Originally Posted by dale c. View Post
the 12 v wire hooks to the + side of the coil , the points wire and the condenser hook to the - side of coil .. after that clean the points with emery cloth or sand paper set gap at .020 hopefully that will get it going
I had it hooked up right the first time but it ran rough it ran perfect in the other tractor rate before I pulled it out, so i switched the the coil wires around and now I'm not getting any spark also the black box that the harness is connected too was sparking when I fired it up so that was also shorting a little bit ... now if got nothing
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Old 05-28-2019, 03:17 PM
R Bedell R Bedell is offline
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the black box that the harness is connected too was sparking when I fired it up so that was also shorting a little bit
You may have toasted the Voltage Regulator (V/R). However, the engine can run a short while without a V/R.
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Old 05-28-2019, 05:30 PM
Marinemp Marinemp is offline
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You may have toasted the Voltage Regulator (V/R). However, the engine can run a short while without a V/R.
Yea idk lol I just looked at the points and they had melted plastic on them and smelled burnt so I took the points off the blown up motor they looked brand new put them on no spark.. should I swap the coil ?
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Old 05-28-2019, 11:19 PM
Marinemp Marinemp is offline
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Ok I swapped the coil I'm back in business ... kinda I have spark again and she will start but only run at idel as soon as I try to advance the throttle it dies... is there anything eletrical that could cause this ? She ran fine in my other tractor the only thing dif now is its hooked up to a dif harness and voltage reg.
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Old 05-29-2019, 06:49 AM
crazycubtrio crazycubtrio is offline
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Swap out your condenser also and see what that does
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Old 05-29-2019, 07:18 AM
R Bedell R Bedell is offline
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Swap out your condenser also and see what that does
Ditto. If that doesn't correct it, look at the Carb.
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Old 05-29-2019, 07:26 AM
dale c. dale c. is offline
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did you set point gap to .020 ?
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Old 05-29-2019, 11:19 AM
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Billy-O Billy-O is online now
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Agree on condenser being culprit.... Remember to connect it to negative side of coil.
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