Erwin SR500 by BCM

Kim Boyle's personal SR500 lit up the innerweb last year after its debut at the Chop Meet. A year later he's built another one, this time for a customer. Broad-stroke basics like the stance are obvious, but under closer scrutiny lots of hand-made details emerge. Here's what Kim has to say about it:

Bike name: Erwin SR500

Year and make, model, modifications:  1978 Yamaha SR 500. Top-end rebuild with a little head work, Mikuni VM36 carb, stainless header pipe with a an open reverse megaphone

Frame: Stock SR

Fork: Stock SR shaved legs, lowered 2.5" Progressive springs

Chassis mods: Rear shortened 8" all unnecessary brackets removed and cleaned up, new fender mounts, hack the stock fender to fit. Progressive 1200 series shocks 1" lower than stock

Tire/wheel size and style: Stock Yamaha Mags 19" front 18" rear.  400-19" front- 450-18" rear, Firestone Deluxe Champion tires

Favorite thing about this bike: Probably the rear brake set up, My buddy Pat machined the rotor turning the center holes from rectangle to round and then drilled the rotor surface. then machined a brake stay, I cut down the caliper hanger by a lot, added a braided stainless line, trimmed the pedal down to a circle. It all cleaned up real well.

Next modification: Modifying it out of my garage and into the owner's hands

Other mods, accessories, cool parts, etc: two-piece headlight mount, Ductati monster front caliper & rotor w/ a Honda CR125 master cyclinder, SS brake line, hand-made brake line guide. Chain side case cover cut way down and a guard added. I fabricated the license plate/taillight bracket; Pat and I worked out the taillight, Biltwell supplied the reg tube. The tank is a Yamaha GT80 tank painted by Jaymes at Blue Moon Kustoms. Duane Ballard did the seat to the owner's specs. A ton of cleaning and polishing.

Thanks to: 
Frances Bernal for the support and putting up with too much garage time.
Pat McCormick at Cutting Edge CNC, for the work & helping keep my head
on straight.
Rob Warren for being a garage mate & putting aside his own project to help
Paul Wisniewski--badge art
Duane Ballard--leather work
Blue Moon Kustom--Tank paint
Wes Drelleshack--wiring/photos
Olympic powder coating, Escondido, Ca
Thumperstuff, your SR headquarters

You can download a desktop background of The Erwin SR500, shot by Wes Drelleshak by clicking the photo above.

from chopcult.com