Broken commandment; home drilled 85 main jet. Walmart.

[niz76]

Hi fellas (and ladies-I'm sure there are some ladies here right??) 

I broke one of the ten commandments of scooter tuning; "Thou shalt not drill his own jets" lol.

Unfortunately my info here isn't very precise and I cannot locate the references. 

  During a 2am binge of forum reading and Brent's youtube videos I just couldn't wait until tomorrow to get some bigger jets for my carb to go along with the shiny new expansion pipe that came today and I installed. I did some googling and found some conversion info about main jet sizes to inches, mm, etc. Somehow I surmised that it takes a 1/32" precision drill bit to equal an 85 main jet size for 1pe40qmb minarelli stock carb. Since then- I've learned on this forum that main jet sizes differ in measurements, flow rate, etc. from different manufacturers. Like I said, this tip isn't precise in the all the info but it worked out great for me.
  I found a precision drill set at Walmart- 2am scooter tuning headquarters haha- made by Dremel. The smallest bit in the set is 1/32". I carefully chucked it in my drill and- I believe this is the most important part- drilled the main jet out with the drill in REVERSE. I did this to avoid the bit biting in too aggressively in the soft (brass?). While holding the drill as straight as possible I started out slowly at first, but realizing I was moving around too much to get a precise hole, I ended up squeezing the trigger in a quick burst and it easily went through in one quick motion.   
  I realize this isn't advised and that jets are very cheap etc. However, I did this about a month ago and it's worked out great for me. It just happened to be perfect fuel flow for my setup and my scoot is a dependable daily driver and runs like a top. I still currently have this main jet installed. 
  Simple Trick but I though this might be handy for the guy (or gal) wanting to up main jet size at 2am. Everyone is a scooter ride away from a Walmart right?

[dude]

I use a hand drill. No power no hand crank. Just a slow hand drill. Sorry no porn. Lol

[stepthrutuner]

I've used diagonal cutters to square off sewing needles at their thickest point to dill brass jets on more than one occasion. Need some measuring calipers though.

[Corrosion]

Drilling jet's is often not repeatable proposition. but reaming then is. it is a little bit of an investment. but worth it IMO

www.racingplanetusa.com/carburetor-reamer-incl-handle-case-p-262-1.html?utm_source=google&utm_medium=google_merchant_us&utm_campaign=google_products_us&gclid=CIW408CsrL8CFdBi7AodIAIAbg#.U7b6gvldW30

[Kick start]

wow wow wow I use my hands and fingers hold the drill bit with your fingers tight and twist the jet with your fingers slow work perfect ever time. 

[Corrosion]

Lord, I tried.

[stepthrutuner]

This limited set is available from HF for $3.79 regular price.

[stepthrutuner]

Drill bit conversion chart if you dare drill (two attachments overlap):

[Kick start]

just saying that jet sizes are in mm 95 jet is .95mm a 102 jet is 1.02mm

[kattman]

I have found a hobby shop has drill bits that are ideal for jets .

if you want to try something crazy get real long ones and a pin vice, remove the cap and needle and drill it on the scoot! I haven't had the need yet but thinking about it ( Sealed Carb )!
Source for long #bits www.electronicplus.com/content/ProductPage.asp?pagenum=3&lname=&maincat=ht&subcat=hdR

[2TDave]

Then you would have metal shavings in your carb. I know they'd be small but still not something I'd do to save the little time it takes to remove a main jet.

[forde88]

you would obviously clean and blow out the jet before reinstalling

i would hold jet and twist drill bit through by hand. wouldnt use dremel in reverse, drill bits are only sharp on one side lol but brass is so soft u got away with it

[2TDave]

He was talking about drilling the jet from the top of the carb. What would be the purpose if you were going to drop the float bowl and remove the jet to blow it out?

[runningbuck]

it was an idea for those that have sealed carbs and not the tools or knowledge to unseal them

[Clank]

Jul 4, 2014 14:05:52 GMT -5 Corrosion said:

Drilling jet's is often not repeatable proposition. but reaming then is. it is a little bit of an investment. but worth it IMO

www.racingplanetusa.com/carburetor-reamer-incl-handle-case-p-262-1.html?utm_source=google&utm_medium=google_merchant_us&utm_campaign=google_products_us&gclid=CIW408CsrL8CFdBi7AodIAIAbg#.U7b6gvldW30

That's the most expensive tip cleaner for a torch or welding tips I've ever seen. I only pay like $2.95 at my local welding supply store.