Something doesn't add up here. You say you reached 62 MPH yet the Tachometer reads only 2000 RPM ? Do you have an "Overdrive Kit" installed ? I'm at 2400 RPM and only going 55 MPH in my Deuce ( or there about ) .TRUCK UPDATE
The injector timing looks correct by the (Troubled Shooting Manual LDS-465-1 Multifuel engine). Also I can't see the timing being off cause I didn't have this problem before it sat around. So I cant see the timing jumping when it not moving. Also for the last few days I have been getting fire wood with truck. Been pushing the truck by leaving it in 4th gear and scramming it with a joke load of fire wood. All stack from front to back and to the top of the bed rails. Been also burning some oil with the diesel to help lubricate. Truck finally broke free yesterday in 5th gear on straightway was able to do 62mph but rpm only got to 2000rpm and the pedal was all way to the floor. Truck is improving but not wear it used to be and it still smokes. In the following weeks I am going to remove the IP pump and clean it & rebuild it. I am thinking the some thing with the IP is my problem.
I'm not trying to "bust your chops" but I am curious.