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Idles but won't rev! 421 cub


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So I've had my bike done for awhile and has been a monster, then while riding it. It just quit revving out wouldn't go hardly at all, I've went through everything, harness, coil, grounds, flywheel, carbs completely, I'm very good with my bike and this has me stumped! Sits and idles. Starts with ease!

 

421 cub-clean up

35pwks, snipers, vf3s

+4 timing- pump gas 22cc domes

160m 48p needle middle clip

 

It's ran great jetting is on and running on both sides..... Now just idles and won't rev off idle, bogg pretty bad???? Any help would be great.

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