Spark issues on Yamaha Moto 4 350 1987 - ATVConnection.com ATV Enthusiast Community



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Old 08-12-2017, 02:47 PM
Weekend Warrior
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Join Date: Aug 2017
Location: Valparaisi, Indiana
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Default Spark issues on Yamaha Moto 4 350 1987

Hi
I am working on spark issue on my Moto 4 350. Bike had a broken clutch and I end it up swapping the engine from doner big bear350 1990. Engines swap was easy , no modifications needed it bolts right on. After the engine swap, I found no spark issue. Just to explained, I kept the original Moto 4 CDI . Could that beat problem, not using big bear CDI? Original engine Moto 4 ran fine but the clutch got mess up. I was thinking engine swap would be easier, found out , not so much. Any one came across similar issue?
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Old 08-13-2017, 02:40 AM
Pro Rider
 
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Location: Lancaster England
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Recently, someone on here posted a picture of a Yamaha stator with two trigger coils for the spark, so if one of your stators has, and t'other hasn't, this could be your problem.

If you can find wiring diagrams for both bikes, it will show any differences in how the ignition system works.
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Old Today, 05:02 PM
Weekend Warrior
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Thanks for suggestion.
Both don't have a spark with this set up. Again, I am trying to run big bear 350 1990 engine in Yamaha moto 4 1987 bike. I am changing only the engine but trying to keep all yamaha moto 4 350 1987 components. Anyone knows if this will work?
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