Message from BMI Racing The DB12R is a revolutionary step forward in 1/12th scale car design. Two years of research and development has culminated in the kit you have before you. The goal of the DB12R project was to take the best features of T-bar cars and Link cars and combine them to make a new type of rear suspension that will set new standards for speed, versatility and ease of use. I call this new suspension system the BMI Flex Link.
Front suspension assembly Step 1 Locate your lower front suspension arms and the hard anodized alloy pivot balls. Note that the arms are symmetrical. At this time you must pick which one will become the left and right arms as this will determine how you pop the pivot ball into the arms. Pop the pivot balls into the arms with the shoulder on the ball facing up. Do this by placing the ball on a hard flat surface and placing the arm over the ball. Carefully push the arm down over the pivot ball. Be careful.
Step 8 Step 6 Locate the Ti front axles, four 4-40 alloy lock nuts, and two alloy pivot balls. Attach the upper suspension arm assembly to the lower suspension arms as shown with 4-40 x ½” screws. Thread the Ti axles into the steering spindles. Note that the threads on the axles that go into the spindles are left hand. After the axles are fully seated tighten an alloy 4-40 lock nut onto the threaded stub coming out the back of the spindle.
Step 10 Locate four 8-32 x 5/8” screws and 4 nylon lower suspension arm risers. Pass a screw through the chassis and slide a nylon riser over the screw. Start threading the screw into the lower suspension arm but do not tighten it. Pass another screw through the chassis and slide a nylon riser over that screw. Start threading the screw into the other hole on the lower suspension arm. Tighten both screws. Repeat on the other side.
Step 12 Step 13 Take a minute to prepare all your carbon components for assembly. With a file or sand paper knock off any sharp edges along the perimeter or the carbon parts. The cell slots in the chassis are designed to fit the cells properly if you just knock off the sharp edges. If you bevel the cell slots the batteries will hang below the bottom of the chassis. Special note: Carbon fiber dust is really bad for you. Always wear a mask and eye protection when sanding or filing carbon fiber.
Step 16 Step 18 Locate and install the two long gray anodized threaded spacers as shown with 4-40 x ¼” flat head screws Step 18 Locate the two alloy rear pod plates, the alloy rear pod plate spacer tube 2 4-40 x 3/8” flat head screws and 4 4-40 x ¼” flat head screws. Attach the alloy pod plates to the lower carbon pod plate with the 4 4-40 x ¼” screws. Attach the alloy rear pod plate spacer tube to the allow rear pods with the 2 4-40 x 3/8” screws.
Step 20 Step 21 1. Install the molded shock mount-antenna mount with 2 4-40 x 3/8” flat head screws 2. Assemble the IRS Nickel-Teflon Pro Shock as per the included instructions with 35wt silicon shock oil. 3. Place the one long black alloy ball stud in the antenna mount and a standard ball stud in the rear pod top plate as shown. Secure the top pod plate ball stud with an alloy lock nut. 4. Install the included gold shock spring onto the shock and snap the shock in place.
Step 23 Step 22 Insert the IRS precision ride height adjuster cams into the rear alloy pod plates. Insert a 3/8” x ¼” flanged bearing into each ride height adjuster and insert the axle as shown. Note that the left clamping hub has the shallow center boss out towards the wheel. This is necessary to have symmetrical wheel spacing. Install your favorite wheels and measure the width of the car. Shim as necessary to obtain a centered axle and a 172mm rear track width.
Step 26 Step 25 The Servo mounts are attached to the lower chassis with two 4-40 x ¼” flat head screws. At this time drill out the center holes on your servo saver (not supplied) for two Nickel Teflon ball studs. Secure them with two 3/16 alloy lock nuts. You have two sets of servo mounting holes in the chassis. They let you achieve proper linkage geometry whether you run your ball studs in front of the servo saver as shown or behind them.