Drilled Keihin jet is a number????

[Dirtcrasher]

Okay, when I jet I use a nice set of drills and step it up to a good color. Local shop won't let me place my drill in the jet to obtain a size.

I am at .063 on a Keihin FCR long hex.

Anyone know if that's a 160 170 180 etc.?? Thank you.....

[onformula1]

A 1/16" bit = .0625
A wire size #52 = .0635

I don't show a .063 = 1.6mm Where did you get that? I thought I had every drill bit!...LOL

A 1/16" bit fit perfectly in a #160

Let me know if I can help out, I have every jet size from #110-#192

[just ben]

I believe it was sudco that had the jet numbers and actual size.

[Dirtcrasher]

Thanks so much guys!! I can tell I'm very lean but thats probably because the last thing I did was pop on a ported head and an FCR carburetor. And 13 discs on a Supertrapp.

Thanks again and see you soon Ben!!

[Dave8338]

Good info in this thread. Pull a few disks out of the ST and set out for some plug chops.

[aramid]

.
As onformula 1 says . . .063 = 160 keihin

Fuel flow thru a jet is affected by a few different factors these are length of jet, size and shape of taper entering and exiting the hole, rifling and hole size . . rifled jets should neve5r be drilled . . because the taper affects the jet a non rifled jet should not be drilled more than 2 sizes larger and really just 1 size would be preferable, otherwise it gets difficult to know what that jet really equates to in a non drilled jet.


Keihin jets are easy, the following is an example.

100 = 1.00 mm

155 = 1.55 mm

170 = 1.70 mm


Jet brand conversion chart

http://www.jetsrus.com/FAQs/FAQ_miku...ihin_sizes.htm


Some number drill sizes fall between mm drill sizes and vise versa so you need a drill size chart . . mm drills might be a bit hard to find . . try an industrial hardware store, tool supply or graingers if you need them and can’t find them.

This chart has number and metric drill sizes.

http://tigercaminc.com/?page_id=45



heres a mm to inches and inches to mm calculator

http://www.electricscooterparts.com/...lculator2.html