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2003 yamaha 660r
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4 Posts
Discussion Starter #1
I have a 2003 raptor 660r bored over to 686 and its popping at high rpms and I have to tune it mid ride is there any fix to this? I've been told to change the the jets but idk what size jets I need its bored to 686 with a full sparks racing exhaust. Any advice will help.
 

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04 raptor 660. 686 big bore with open airbox/k&n. Big guns slip on exhaust
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134 Posts
Popping could indicate either way. When is Popping? Just on decel? Open airbox? Elevation? I think we need more info
 

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Master of the Electron
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15,236 Posts
Is airbox stock or opened up?
 
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