Re: DWMS Racing RD350 Build! I Finished Building The New Rear Tank Mount Today!
Thank You Brothers, as always your kind words mean more to me than you will ever know!
Brother axeugene27 when I originally designed the new side frame rails I left enough room to install the complete bottom end and then assemble the pistons, cylinders, and heads onto the engine once it was in the frame, now that I have the new frame rails on it looks like there may be enough room to install the complete engine however I am going to stay with the original plan to make sure I do not scratch the paint on the engine or the frame during final assembly.
After talking with Brother Bluesmokey some more about the design of the body work we decided not to build a one piece body for this bike as we had originally planned as he has a couple of different ideas for the upholstery and we would like to keep our options open so I am building a one piece fiberglass seat and tail section that will be separate from the tank. While we were talking we decided to mold the front of the seat to cover the rear of the fuel tank so I have been designing and building the rear mount for the past couple of days as I need the tank to be sitting in its final position before I start molding the seat pan.
From the factory the RD350 fuel tank does not have an actual rear mount. The factory design has the tank sitting on a single rubber underneath and a single rubber on each side so that it can not move from side to side, the seat is what holds the tank down. I designed the new bolt down rear mount to have all of the same factory contact points and to be fully rubber mounted as well.
On the bottom of the fuel tank I removed the rubber from the side cups and I also removed the bottom half of the cup on each side so that I could drop a length of tubing that I cut into the cups and weld it in, once I had the tubing welded into place I drilled two holes into it and welded in two nuts. For the center mount I made a tab and welded it to the tubing.
I wanted the rubber to be replaceable on the center mount so I built a bolt in shouldered post and threaded the middle of it so that it mounts to the tab that I welded onto the center of the tubing I added on the bottom of the fuel tank. The rubber is a factory RD350 front fuel tank mount with an additional rubber insert for added cushion. The rubber shown in the photo is a old one that I used for test fitting and it will be replaced with a new rubber for final assembly of the motorcycle.
This photo shows the center mount bolted to the new tubing I added to the bottom of the fuel tank.
For the frame mount I made a cross brace and welded it to the frame, I drilled two large holes in the brace to hold the shouldered rubber isolators that the fuel tank sits on and the tank mounting bolts run through so that they are fully rubber mounted.
This photo shows the tank mounted to the frame, there will be a couple more washers and I will also install a set of rubber collars around the center rubber mounts between the new tubing on the tank and the frames cross brace for final assembly.