Jet boring

ChipToothy · 09-10-2021, 01:25 PM

Hey guys, which size drill bit do I buy to bore a jet out to 140 Mikuni? My guess is a 1.40 mm.

harley87ta · 09-10-2021, 05:20 PM

You should by the mini drill bit set from harbor freight. I used it for my pz30 carb. I was impatient and figured I'd try drilling first and if I screwed up I'd order the jets. but it worked out good for me

https://www.harborfreight.com/high-s...-pc-61526.html

krat · 09-10-2021, 08:34 PM

It also comes to .055" or 1/16"

Google is handy for conversion charts.

Badluck · 09-11-2021, 12:38 AM

I forget what company it is, but the number is ml/min of fuel at max flow.

09-10-2021, 01:25 PM	#1
ChipToothy Join Date: Apr 2018 Posts: 819	Jet boring Hey guys, which size drill bit do I buy to bore a jet out to 140 Mikuni? My guess is a 1.40 mm. __________________ Bashan Storm: Ebay steel exhaust wrapped, folding shift lever, seat mod, vm26 carb, air pod, dual led scrambler headlamps, windshield mod, led brake/tail light, secondary led brake light (swingarm), Ebay 295mm rear shock, back up CDI (racing unknown), oil cooler, digital gauge cluster,
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09-10-2021, 08:34 PM	#3
krat Join Date: Nov 2019 Location: KY Posts: 265	It also comes to .055" or 1/16" Google is handy for conversion charts. __________________ %90 of the Chinese motorbikes ever made are still on the road. The other %10 made it back home.
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09-10-2021, 05:20 PM	#2
harley87ta Join Date: Jul 2021 Posts: 24	You should by the mini drill bit set from harbor freight. I used it for my pz30 carb. I was impatient and figured I'd try drilling first and if I screwed up I'd order the jets. but it worked out good for me https://www.harborfreight.com/high-s...-pc-61526.html
	1

09-11-2021, 12:38 AM	#4
Badluck Join Date: Jun 2021 Posts: 80	I forget what company it is, but the number is ml/min of fuel at max flow.
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