Nothing in the starting system made it stall at 70mph. If you bypassed the battery cables and no change in cranking that eliminated those as the issue. Now lets get to a detail you mentioned. You said you had slow cranking with the sparkplugs pulled out. That isn't good. It should crank over super fast with them out and HC pistons wouldn't matter. This tells me it may be time to check to see if you have oil pressure. The 02 had a defective oil pump drive gear from the factory. They are prone to break and stop the oil pump from turning. I would pull 1 plug from each cylinder and loosen the oil line at the "Y" Banjo on the left side of the bike. Crank it over and you should have a high volume of oil coming out while cranking. If not your gear is broken and the engine may be partially/starting to seize up on the rod crank journals.
Here is a pic of the old style gear and the new updated gear. The 1 on the left is the old style gear, The ears break off and cause oil pressure issue. Notice the same area on the
beefed up new gear
Here is a pic of the old style gear and the new updated gear. The 1 on the left is the old style gear, The ears break off and cause oil pressure issue. Notice the same area on the
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