2000 M750
so I have about 700 miles on my rebuilt engine at the moment. while I had it apart I tested the pickup coil resistances just for the heck of it and they both tested at 102 ohms. manual states oem spec is 95-105 ohms.
well a couple days ago out of nowhere I noticed a decent drop in power, and my tach occasionally hopping a little and a few random stutters in running condition, so I assumed a misfire (ducati performance tach). sure enough I found the female spade terminals in the interrupt harness for the tach to be gapped slightly wide and not making constant contact. removed the terminals from the plug, crimped them down a bit, plugged it back in and went for a test ride. I was right, engine now runs smooth as glass again, tach never hopped once, zero stutters, and a hair of power gained.
BUT it still is noticeably less powerful then it was a week ago. same weather conditions, same fuel, plugs read normal. It's like one day it ran great and strong, the next day it had lost like 20%. To me it feels as if I either retarded the ignition a few degrees, or went 10 points higher in octane rating, but I did not do either of these. It runs beautifully, just noticeably weaker all of a sudden, it was not a gradual drop, it happened literally overnight.
So I tested the pickup coil resistance again while the engine was pretty warm (about 20 minute cool-off from riding, on a 90 degree day), and the resistance of both pickups was exactly even at 118 ohms, which as noted above is out of spec.
is it normal for the resistance of the pickup coils to get this high when hot? or should it still be within oem spec whether it's hot or cold? the pickups are original, with 21k miles on them
No hot spec in the manual. Resistance increase with temperature is normal. A defective pick up will either be well above or below the spec.
ok thank you