Tiger the tests so far make this the best carby ever produced anywhere in the world. One test I haven't tried is using the nitrile seat and the Victa needle, might work and save the problem of having to machine the needle down, but the fact that I have to drill the primer cap out to 3/16th inch may allow the Victa needle to wobble about a bit much and it may not center up on the seat, not sure I might look at that tomorrow