Topic: Say it aint so! Drilled or not?

[drillzzz]

Yes its me again and another thread with yet more newbie questions?

How can I tell if the pilot jet hole has been drilled or not? I was looking through bags of bits and pieces the owner gave me along with the bag and I found a drill bit    The bike did have pods on it along with open 4to1 kerker. I hope the guy didn't drill the damn thing and if he did will it hurt the bike to go back to stock air box with larger pilot jets?

[faux fiddy]

You can find a very tiny set of indexed drill bits (these are very fragile). I used them to cleanout my pilot jets, using a small collet to hold them.  I used about aproximate .0014 drill (maybe it was an "#80") which is hardly as big as a wire in a bread tie. The 350f pilot jet is .0014 if  remember correct.

You will also need a chart that converts guage sizes between the drill bits you get with the set and  standard jet sizes, and metrics for good measure.

Using progressively larger drill bits you can see which fit through the jet without hanging up. From there you can tell  a close aproximate size it is compared to what it is supposed to be.

Here is a product or two, surely there are many.

http://www.amazon.com/MINI-DRILL-INDEX-61-80-QUALITY-Drill/dp/B000VNPRNQ?tag=dogpile-20
Technical Details
20 HSS twist drill bits in storage case
Sizes: 61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80mm
For use with a power drill
High quality tools for the professional

--------------------------------------------------------------------------------


Product Description
20 piece precision ground twist drill set with storage case and pin vice. Great for electronics, crafts, jewelry, watch making.

Includes the following sizes:
#80 (.0135") #70 (.0280")
#79 (.0145") #69 (.0292")
#78 (.0160") #68 (.0310")
#77 (.0180") #67 (.0320")
#76 (.0200") #66 (.0330")
#75 (.0210") #65 (.0350")
#74 (.0225") #64 (.0360")
#73 (.0240") #63 (.0370")
#72 (.0250") #62 (.0380")
#71 (.0260") #61 (.0390")

Caution:

Bits are sharp! You can easily stab yourself
Always wear approved safety glasses
These bits break easily. A fixture or vise is recommended
No warranty for bit breakage
These bits are so small they look very similar. Use a micrometer to verify size.


The ones I used were in a case more like this, and they're a bit more expensive, but not too bad:

http://www.micromark.com/20-PIECE-MICRO-SIZE-DRILL-BIT-SET-WITH-INDEX-61-80,6758.html




Using a bit of carb cleaner,  these are great for  clearing  out clogged jets if you are careful.

[Bodi]

Usually you need smaller pilot jets when going to headers and pods. That said, it is very hard to gauge the size of holes in jets. There are hole gauge sets, a series of progressively sized precision diameter rods. A set of 4 new jets to assuage any worries will cost a fraction of what a gauge set costs.
Drilling jets is not unusual but you can't do it with the accuracy and surface finish that Keihin does and without a gauge set you can't know the actual orifice size is. You can get your bike running fine but you cannot translate your drilled jet size to a Keihin jet size number exactly.

[drillzzz]

Hey thanks everyone for the quick help. I changed the main jets and discovered the number 35 on the pilot jet (stock pilot jet). When I saw that I was happier than a kid at a candy store. The PO was smart enough to leave that alone but did have a drill ready for the job. Whew... Lol