Drilling Jets

[Banksy]

Does any one know what the size of a jet relates to in mm ?
I have lots of small jets 60-90 none of which are any good for my setup, Can I just drill them out to the correct size?

And yes I have a set of precistion drills 0.1mm to 1.6mm in 0.1mm increments

What do you think?

 

[DRXRACING]

Does any one know what the size of a jet relates to in mm ?
I have lots of small jets 60-90 none of which are any good for my setup, Can I just drill them out to the correct size?

And yes I have a set of precistion drills 0.1mm to 1.6mm in 0.1mm increments

What do you think?

The Kehin/OKO/Koso main jets are in MM per size . So you can take a drill index conversion chart which contains the drill designation then its size in MM . The mm size of the drill bit is the equivalent to size main jet Number on the previously listed jets.

 

[tiba_karotsu]

this is easy, 1.00mm = 100, 0.50mm = 50, 1.20mm = 120.

 

[Mexicano]

Another one...

Jet 50 Drill Bit #76
Jet 55 Drill Bit #74 approx.
Jet 60 Drill Bit #73
Jet 65 Drill Bit #71 approx.
Jet 70 Drill Bit #70
Jet 75 Drill Bit #69 approx.
Jet 80 Drill Bit #68
Jet 85 Drill Bit #66 approx.
Jet 90 Drill Bit #65
Jet 95 Drill Bit #63
Jet 100 Drill Bit #61
Jet 105 Drill Bit #59
Jet 110 Drill Bit #57
Jet 120 Drill Bit 3/64 th's
Jet 130 Drill Bit #55
Jet 140 Drill Bit #54
Jet 150 Drill Bit #53
Jet 160 Drill Bit 1/16 th's
Jet 165 Drill Bit #52 approx.
Jet 170 Drill Bit #51
Jet 180 Drill Bit #50
Jet 185 Drill Bit #49
Jet 195 Drill Bit #48
Jet 200 Drill Bit #47
Jet 205 Drill Bit #46
Jet 210 Drill Bit #45
Jet 220 Drill Bit #44
Jet 225 Drill Bit #43
Jet 230 Drill Bit #42
Jet 245 Drill Bit #41
Jet 250 Drill Bit #40

 

[rydah]

can somebody post the link to where i can pick up that small bit set. thanks.

 

[Banksy]

I have a dellorto carb and the jet sizes are not in mm, a 1mm drill will not go through the 100 main jet, so any other ideas

link to basic drill set:

http://cgi.ebay.co.uk/20-PIECE-MICR...ryZ67240QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[tiba_karotsu]

I have a dellorto carb and the jet sizes are not in mm, a 1mm drill will not go through the 100 main jet, so any other ideas

link to basic drill set:

http://cgi.ebay.co.uk/20-PIECE-MICR...ryZ67240QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

yes it will not b'coz the 100 jet is slightly smaller like a 0.99 or 0.98mm, the drill bits these companies use are machined differently so you'll always have an error of +-.01mm

 

[Mexicano]

can somebody post the link to where i can pick up that small bit set. thanks.

In the U.S.

http://www.houseofhobbies.com/midrbi.html

Regards,

 

[tiba_karotsu]

i want that walthers drill bit set from #61 to #80!!!

 

[adas]

can somebody post the link to where i can pick up that small bit set. thanks.

Rydah, the guy at Aloha tap (I think) has them. He is just Makai of King and Eva of the canal in Kalihi.
frank

 

[rydah]

Rydah, the guy at Aloha tap (I think) has them. He is just Makai of King and Eva of the canal in Kalihi.
frank

cherry brah, thanks.
tiba what size drill bits does that 61 to 80 take care of in jet size.

 

[tiba_karotsu]

cherry brah, thanks.
tiba what size drill bits does that 61 to 80 take care of in jet size.

it's from 0.35mm to 0.99mm, great for small carbs up to 21mm. looking for one again as i am missing a few important bits.

 

[Rage]

Mikuni & Keihin jet numbers refer too CC of fuel passed per min.
The link below shows Jet # and actual size for Mikuni/Keihin.

You have to watchout as some use actual size and some CC flow.

Also it's better to ream the jet that drill as standard 2 flute drill bits will tend to cut oversize or oval in brass jets.8)

Find the jet list at http://rage-composites.co.uk

From the list you will see that drilling jets with a twist drill is so inaccurate you could end up with a 140 jet then you think you've drilled it to be a 100.
It's safer to purchase a jet set from scooter attack or scooter center and alot easier too.