ORIGINAL: flyinryan
I was impressed on how the OS engines stayed in tune. I head that replacing the needle valve on a Fox 35 with a ThunderTiger needle valve helps out the Fox alot.
Replace a Fox N/V assembly with an OS/Enya N-V assembly. Place the feed hole to the
back, just out-of-sight, using enough washers to assure the feed hole is centered. Makes a big difference in the engine run on a Fox.