both exhausts seems like bad firing(jerk) during riding

Yamaha XV 250 Virago discussion forum:


both exhausts seems like bad firing(jerk) during riding

both exhausts seems like bad firing(jerk) during riding 
api said 2007-04-21 18:28 
 
after a while riding I can feel the exhausts & the engines jerking.A pop sound repeatly heard from the exhausts.It is a spark plugs problem?And whats is the standart size(spark plug)?? 
 
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