DT1 MX project

The '77 RM250 swingarm shock mounts are 1/2" wider than the DT frame, so I'm moving each side out on the frame 1/4", and going slightly forward and down. This picture shows roughly where they will be going.


To make the new mounts I'm starting with a part of an old bumper jack. It is 1/8" steel, and has a good shape for what I need.


I cut off the outer parts of the mounts, but left the main inside gusset, fitting the new ones over them. With the 1/8" of the new mounts and 1/8" washers welded on, it moves the shocks out the 1/4" I needed.


Here are the new mounts cut from the jack, and sandblasted to clean them up. The two together weigh less than 11 ounces, so not too heavy.


I welded them on, and then cut and welded on outer supports from a junk TT500 frame. I then put it back into a roller.


Next up is an exhaust. Here is a stock DT1 exhaust in place just to show the lowered engine cradle of the frame. Normally it would fit up into the rear upper corner of the frame in front of the upper shock mount.


I want to use a 1970s aftermarket exhaust, so I got this Torque Engineering pipe. It is supposed to be for a Suzuki TS250, but was only $40 shipped, so I'll make it fit.


I'll need to redo the front part anyway, so went ahead and cut it off.


I tacked a mount on so I can decide exactly where it needs to go and what needs done to fit it, but I think I can get it to work. I'll probably go lower in the front. Once the front is done, I'll cut off and reposition the stinger.