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Discussion Starter · #1 ·
Just wondering if intalling reeds spacers and Boyesen reeds will help with a rich stumble around 4000-4500 rpm on a stock 05 ZR900 or should I just install complete Vforce3 or Rad Valves from Boyesen?

Thanks guys
 

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Get a pack of needle shims, clip it 3rd and start with the purple under the clip (3 3/4), I run 3 1/2 (silver shims) and its perfect, HPE has them...
 
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