Got my 13.8 kg/mm Eibach spring equipped R1 shock back this week. Looks pretty good on there, kind of a blood red color. Now I just need to get the bushes bored out to 12mm so I can mount it up. One of the bushes slipped out easily, but I'm still not sure exactly how to go about boring it out. I have access to a drill press, but how do I secure it in place without damaging it's exterior? The other bush apparently comes out with a hammer and a socket.
Seems like what I need is a drill press with a vice to keep this round thing from just spinning as I drill into it...
Here's a pic:
(The spring doesn't look that bright red in person, more of a Burgundy or Maroon.)
It's a 2008 Yamaha R1 shock with a Racetech-installed 7.0" x 2.25" 13.8 kg/mm (775 lb/in) [P/N SESP 702250775] sandwiched between two 58 mm x 55 mm reducing collars [P/N SPSC 5855]. I delivered the shock (sans original spring) to Louis Martinez at Racetech in Corona. After confirming fitment, he ordered the spring from Eibach. It took several weeks to arrive---my only complaint, as Louis had said it would be there in a couple days. But he didn't charge me to install the new spring, and got the shock back to me by Christmas, so I'm a happy camper. $153 for the Racetech parts and shipping plus $60 for the used R1 shock.. $213 ain't bad for a custom-sprung, 3-way adjustable shock. Now I just need to get on the drill press and bore out those mounting bushings so I can get this baby on the road.
I'll know a lot more after a test ride, but as far as I can tell the only drawback vs Zeph's setup is that this standard 7.0" x 2.25" Eibach spring requires reducing collars which are 1.6 mm thick---which is like bumping up the minimum preload setting three notches or 3 mm.