DT / MX Motor Swap Fail
Last year I met an older guy at Ride 2 Skate. Ed and I had rode our dirt bikes down to the show and this guy was pumped on them. He said he used to build and race flat track with the DT’s back in the day. He explained the hot setup was to use the earlier model DT’s with dual rear shocks and swap in a motor from a later model mono shock DT / MX and that it was a direct swap.
The benefits are:
– Lighter engine
– 6 speeds vs 5 speeds
– Overall more solid engine
– Parts availability are better (Wiseco makes piston kits for $100)
Well this got me pumped so at some point last year I picked up this 1981 MX 175 cheap with a solid motor, no title, and a bit rough around the edges. It was perfect candidate for the motor swap. However, after a few hours of disassembly and attempted reassembly the motor doesn’t swap over clean. Motor mounts kinda line up but more importantly the chain line is about an 1/8″ off so basically it would need all new mounts to correct everything. So the swap is possible but currently more work than I’m looking to invest in it. I had to try it for myself and this post is for anyone (probably few but..) who has thought about doing this.
7 responses to “DT / MX Motor Swap Fail”
Published - Sep 23, 2011
After having a great time at Aaron’s wedding my buddy Ryan and I headed south for some good riding and camping. That was about the extent of our planning for the 2 week trip. My 1976 cb550 and Ryan’s 1972 cb500 Camped lakeside in Virginia. This is the off season so there’s been few campsites […]