167 FMM weak spark issue

sofaking · 04-13-2024, 04:40 PM

o7 Wildfire 250 acquired with damaged wiring harness and a new rotor/stator that was partially installed because of fitment issues. Once I removed the rotor I discovered mismatched keyways 3mm rotor/4mm shaft, made a custom woodruff key. Then saw pulse coil was about 6-7mm out of align with rotor pulse pad. Milled down the mount posts about 6mm. Done-right? Wrong. With my Fluke set on AC upon cranking stator(red/black)wire reads 40V and pulse coil reads 0.50V. when I connect CDI my coil signal is 4V. IDK what it is at the plug but spark is very very small and blue. Does anyone have any suggestions that could get me running?

sofaking · 04-15-2024, 12:55 AM

if AC cdi power is 40V and pulse is 500mV then what shoild cdi be sending to the coil in order for the coil to fire a hot spark? trying to determine the weak link here. please help.

04-13-2024, 04:40 PM	#1
sofaking Join Date: Apr 2024 Location: southern Illinois Posts: 2	167 FMM weak spark issue o7 Wildfire 250 acquired with damaged wiring harness and a new rotor/stator that was partially installed because of fitment issues. Once I removed the rotor I discovered mismatched keyways 3mm rotor/4mm shaft, made a custom woodruff key. Then saw pulse coil was about 6-7mm out of align with rotor pulse pad. Milled down the mount posts about 6mm. Done-right? Wrong. With my Fluke set on AC upon cranking stator(red/black)wire reads 40V and pulse coil reads 0.50V. when I connect CDI my coil signal is 4V. IDK what it is at the plug but spark is very very small and blue. Does anyone have any suggestions that could get me running?
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04-15-2024, 12:55 AM	#2
sofaking Join Date: Apr 2024 Location: southern Illinois Posts: 2	Not getting enough spark to run if AC cdi power is 40V and pulse is 500mV then what shoild cdi be sending to the coil in order for the coil to fire a hot spark? trying to determine the weak link here. please help.
	0