Update: Before rebuilding the shock on my 2012+ dl650, rear sag with preload set a 5 lines was 70 mm for the following weight: 160 lbs naked rider, 185 lbs dressed, 35 lbs for carryon tools and bolt on accessories, 30 lbs for the top box, and 15 lbs for the pillion bag. Total 265 lbs. Initial results show that by installing a 12.4 shock spring and setting preload to zero, my rear sag is 50 mm without the top box and pillion bag, and 55 mm when i add those 45 lbs. by adding a bit of preload, the spring should be perfect for a solo rider like me. Plus, I should be able to add the weight of the side cases, etc.
for my 2015 dl650, i purchased the EIB-0800.225.0700 shock spiring from Summit Racing equipment. The Eibach spring was delivered for $73. 0800 is for the 8 inch length, 225 is for the inside diameter, and 700 lbs per inch is equal to 12.4 kg-mm.
Summit Racing also offers ….600, 650, 700, 750, 800…etc. Simply enter “eibach 0800.225.0700” for example, to identify sellers for that spring. RaceTech.com and Procycle sell the same Eibach springs for almost 2x’s the price.
I also purchased the required spring bushing and spring collar from RaceTech.com, both delivered for $52 total. If you use the RaceTech “spring rate calculator” for the DL650, the bushing and the collar you need are shown as required adapters for the (eibach) springs they sell.
RT - Digital Product Search
To orient those 2 adapters on the new spring, check out the images provided by fireclimber. He shows the new adapter on top of the old adapters and then the finished product. Use this information when reassembling your rear shock.
Some folks indicate the spring rate for pre 2012 DL650 is 8.2 kg-mm and 9.2 kg-mm for the 2012+. RaceTech shows the OEM spring rate is 8.2 for all years of the DL650. Most agree that the DL650 (and most bikes) are stocked undersprung. So anything better than 9.2 kg-mm is an improvement for the 2012+. The trick is to get the spring rate that is correct for your weight.
Some folks that claim the RaceTech spring rate calculator is too stiff for the sag numbers you want. You’d likely want sag for the “dressed rider” & no cargo to be 35mm with zero preload or maybe one or 2 lines of preload. For my 160 lbs naked, some implied a 10.3, 10.7 or 11.6 kg-mm would be best. Again, anything higher than the stock 9.2 shock spring would have been an improvement. Procycle.com sell dl650 shock springs from 8.0 to 16.1. Go figure.
I used the RaceTech calculator entering my naked weight 160 lbs and left all other items unchanged i.e. street, intermediate/b class, standard stiffness, not lowered. The RT calculator indicated 12.5 kg-mm as the optimal spring rate for me. If I had entered “adventure” versus “street”, the calculator would have called for 13.4.
Removing the shock spring from the 2012+ is very simple, except my SW motech center stand was in the way of the lower shock bolt. I used my dremel to cut out a piece of the center stand. There was no problem getting the preload adjuster past the ABS unit, as was the case for the pre 2012. If you remove the preload dial, which is not necessary, 2 tiny springs and ball bearings will pop out. I took the shock, the 12.4 eibach shock spring, the two adaptors and pictures showing how to orient the adapters — to the local moto shop. They swapped the spring for $50.
I picked up the upgraded shock and noticed the spring was slightly off center, so i hit it with a rubber mallet and it seated correctly. The only glitch on the install was that the slots for the upper and lower shock bolts were not parallel. After installing the lower bolt on the shock, i used a long screwdriver to reorient the upper shock slot for the upper bolt. It slid right in. Study your service manual. At the top of this link, guitarhack does a nice job of illustrating how to do the job. Also, check out Black Lab’s pictures at:
happy trails and thanks for this great thread.