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only mod is K&N R-1100 air filter, hoping to get RS9 next to increase that speed. 160# rider. Wind negligible.
 

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After watching this I'm so happy I switched to a 14t front sprocket... I'd spend the 15 dollars on a sprocket before the yosh and get some actual noticeable improvment.
 

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14t is the only noticeable improvement I have seen. My exhaust and airbox don't improve over the 14t, that is - I put the 14t on first and notice the improvements, then I did airbox and exhaust mods together, and gained nothing. In face, I lost a little mid range grunt after exhaust/air mod.
 

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Nice to know about the counter sprocket change did help.

Same thing when I had my 87 YSR-50 my counter sprocket did help out on the top end speed. Got real 70mph but I also had a tooney pipes, airbox mod, thinner head gasket, modified carb.
 
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