I'm getting a 1975 Yamaha DT250B back on the road and want to check the timing and point gap. I know the basics and have set points on old bikes in the past but I'm hoping there's some DT experts that can help with a couple of questions. I have an off brand service manual for it that might be confusing more than it's helping. The DT250 has a plate that carries the points, ignition, and lighting coils with an external rotor/flywheel that fits over it on a keyway. 1. The factory timing spec is 3.2mm BTDC. I have a dial indicator and based on a visual check of the points, the timing is retarded quite a bit, probably around .8 to 1.0mm BTDC right now. This makes sense as to where the backing plate is oriented on it's screws. It's shifted pretty much all the way one way that would retard the timing. What's confusing is that the manual calls for loosening the set screw on the points and moving the points to adjust timing. It seems to me I need to turn the entire backing plate to adjust the timing and the screw for the points is primarily for adjusting the point gap. Pain in the butt since you have to pull the flywheel each time you want to get to the screws to move the backing plate. Is my assumption that I set the actual timing by moving the backing plate correct? 2. When setting points, I like to use my volt/ohm meter to check continuity and know exactly when the points are opening. The manual I have describes this same method but calls it a "point checker". I've unplugged everything coming from the ignition at the wiring harness (4 wires in 1 plug) and I put my red lead on the points wire (black in this case) and ground my black lead. I'm expecting the circuit to show grounded until the points open then break the continuity. I can see the points open and close but I never break continuity. I know I've had this issue before but can't remember what I had to do to isolate the points so I get a good reading. Any ideas? I've got a good spark at the plug so assume that everything is wired correctly. If I can't get my meter to work, I'll just have to set them visually. Thanks for any help you can provide!