Howdy All! Yep, same bike, similar problem! I wasn't sure if I should start a new thread, but I figure this is more of an oil pump scenario more than anything else. First off, thank you all again for all the help and info I have gotten in this ever-deepening endeavour to get my bike back to the road. I've been going through the engine for my '76 R90/6. So far, new crankshaft, conrods, big end shells, main bearings (WAY easier to replace than I thought it would be), oil presure relief spring/piston, full gaskets and seals, and I'm sure plenty more than I care to price up. In other words, new guts all around and everything is spec'd nicely with all the new tools I got to buy. The problem now is I simply CANNOT get the oil pump to prime. I am wondering if there are any other tricks or methods anyone knows of, or I have overlooked something horribly wrong and it is just bleeding back into the case. And for FYI, story so far is here. Just a run down, I worried the pump spurs were worn, though the gap checked out, so I went ahead and replaced the outter rotor (not the inner too, I couldn't afford the $65 at the time). I read on another post about priming was to pack the pump with vaseline and prime by pushing the bike in 2nd gear a bit or just rotating the tire. Did that, nothing. Tried priming by grounding the plugs and turning over with the starter, nothing. I was finally able to get oil into the galleys enough to get the presure sensor to flicker after filling the filter by hand then priming, but then it dropped off again. Which is only more baffeling. So far I have tracked it all back to the pump, as with the oil pan dropped, I plugged the sump hole and could feel no pressure when using the starter and I tried removing the oil filter to see if any oil would come through the canister fill galley. Still nada. Unless I can find something else to try, I guess I just need to have a real mechanic look at the thing. And just as an extra, I did pull the jugs enough to squirt some oil over the crank and conrod bearings to make sure there was some lubrication on there. I really don't want to replace them again. So yeah, anyone have any ideas or something that I am just completely overlooking? After two weeks of troubleshooting, I think I have a bald spot from head scratching over this one.