1989 yamaha yz250 rad valve... REJET?

[dmstafford79]

Recently obtained a brand new Boyesen Rad Valve system from a parts lot on Ebay.. Will i need to rejet my carb after installing? Carb is on stock settings. How much gain from stock will this have? Bike runs like a raped ape now

 

[arnego2]

Normally so far I know the boyesen reed enrich the circuit throughout. I use the power reed on the stock cage but my bike is a YZ250 '09