Gio Monster Air Filter Mod

Weldangrind · 11-25-2014, 12:46 PM

I use a numbered and lettered drill bit index, which is easily found at Harbor Freight. Just let Google do the math for you.

For example, a 30mm Mikuni comes with a 100 main jet, which means 1.00mm. 1.00mm is really close to 0.040", which translates to a #60 drill bit.

To drill out a main jet to something near 110 (or 1.10mm), select the #57 drill bit, which is 0.043", or 1.092mm.

It's much faster than buying new jets, every time you wish to experiment. BTW, I already had a numbered and lettered drill index, for use with drilling holes properly for tapping. The carb jet use is just a bonus.

11-25-2014, 12:46 PM	#6
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	I use a numbered and lettered drill bit index, which is easily found at Harbor Freight. Just let Google do the math for you. For example, a 30mm Mikuni comes with a 100 main jet, which means 1.00mm. 1.00mm is really close to 0.040", which translates to a #60 drill bit. To drill out a main jet to something near 110 (or 1.10mm), select the #57 drill bit, which is 0.043", or 1.092mm. It's much faster than buying new jets, every time you wish to experiment. BTW, I already had a numbered and lettered drill index, for use with drilling holes properly for tapping. The carb jet use is just a bonus. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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