01 yamaha 115 2 stroke lost spark cylinder 2 & 4

cuenta

Petty Officer 2nd Class
Joined
Apr 26, 2011
Messages
137
What do you think guys. cylinder 1 & 3 the spark is very strong and 2 and 4 is very weak. With the inline spark tester but 1 & 3 but connected directly to the spark plug does not produce any spark.
this is a cdi that i bought used on ebay but it is the same with the original
 

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