I just finished up drilling my '05 Speedmaster slides to 7/64ths. (Built in 12/04.) It didn't make them a whole lot bigger, but the drill did indeed hog out some material. Triumphant's tip about using a slightly larger drill to de-burr was very helpful. New knowledge to me.

Benny was kind enough to send me some proper motorcycle carb shims that were finished on both sides. When I left my job, they must have gotten lost in the shuffle, so I bought some hardware store SS washers, and with the wire wheel on the bench grinder, gently got the burred stamped edges off the backs which made them fairly uniform in thickness under the mic. With two shims in, they equal a fairly fat .055" / 1.40 mm, so I'm a might over what two standard shims measure. Better to be a bit rich I s'pose. Since I gutted a set of stock pipes down to around 1 & 1/4* baffles left, I've been turning a consistent very high 40s & even one 50 MPG. It would sure seem that at 49 or 50 MPG while running a typical cruising RPM of 3500 to 4000, I may be running very lean. One of these days I'll find a dyno that does mixture readings, but until then I believe from all the fine & helpful tuning posts here at BA.com that I'm fairly close to running OK now.

In summary, I'm running 130s or 132s - don't remember, A Uni filter, gutted top & bottom air box, screws out 3 & 1/2 turns? don't remember, and as mentioned, the pipes at 1 & 1/4 baffles. Going from 2 full baffles to 1 & 1/4 baffles made the largest single leap in noticeable performance.

Off to test drive her.

* The front baffle has 4 extra 1/4" holes drilled in it, and the 2nd baffle has an extra 3/4" hole in it, and one 1/4" hole. It's obviously louder than two baffles, but I don't believe it's clean bore loud, and it's definitely far from being "I'm desperately in need of some negative attention, have a very small d**k, and wish to lose 98% of my hearing by age 40" V twin window rattling loud. I can still make it behave where one may not want to disturb the peace.

(One may be able to guess from my rant that I live along a US route where V twins with gutted pipes roll by on a daily basis)