Carb needle drilling

[JohnAldridge101]

Iv read a little into carb tuning on a c1j and what I can gather is that some people drill the jet to 2mm is this the maximum size people dare go? I know it all depends on other variables. Also is it a drill or reamer used? I'm an engineer and my first thought was to use a reamer, not only because it's a much smoother hole created, drill bits often create oversized holes, iv got a few 2mm reamers or loads of 2mm drills if anyone wants to buy some.

[Eugein Offord]

http://www.maplin.co.uk/Module.aspx?ModuleNo=11891


i use these...

[Woznaldo]

I would definitely go with the reamer if you have one as a clean hole is the most important aspect when trying to get it to seal.

I have no personal experience with this but quite a few members do. I would love to see a full article on this as many will reach the limit of the 1.7 mm valve when upping the boost above 20 psi.

[fishead]

if you take it apart an drill it from seat side, leaves a nicer hole which is easier to reseat