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1989 Moto 4 YFM350ERW intermittent spark.

RGS

By RGS
in Yamaha ATV Forum

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RGS

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1989 Moto 4 YFM350ERW intermittent spark.

Quad has set for about 7 years and was running when parked.  When I replaced the battery and attempted to start it had no spark. 

 

What I have done.  Followed troubleshooting in the manual. 

1.       Coil failed the resistance check so I replaced it.  Still no spark.

2.       I performed resistance checks on the stator and they all pass.

3.       Found a bad rear brake stop switch and unplugged it and connected the wires in order to disable.  Now I have intermittent spark.  I believe that the issue is with either the stator or CDI and not sure which.

1989 seems to be a transition year for electrical.  I can get new aftermarket CDI units for 87-88 and 90-94.  I cannot get ones for a 89.  I can get new stators for 87-89 and 90-95.  Looking at the schematics the wiring on my moto is closer to the 90 ones on the ATV side of the CDI and closer to the 87-88 on the stator side of the CDI.  Looking at part supply sources the stator housing is the same part # for all the years and looking at some of the stators on Amazon that have the dimensions on them both of the stators are the same size.

What I am thinking of doing is to replace the stator and CDI with a 90-95 one as these parts are all readily available.   Does anyone know if this has been tried before and if there are any issues with doing this.  

 As a side note I also have a 1993 Moto 4 YFM350ER that has been sitting longer but it is located about 400 miles from me at this time.  By doing this change in addition to being able to get parts I will also have 2 ATV’s that are the same electrically. 

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