Changed jets and engine problems

[Icculus88]

Sorry it happened last week and I couldn't tell exactly where the leak is coming from.

[OldVet66]

I would remove the cover and catch any oil in a clean bowl to put back in the motor after re-seating the cover. It's real easy to screw up the oil filter cover O-ring. I daub dielectric grease in the groove and then press in the O-ring. It stays in when you seat the cover that way and lasts through several oil changes if you happen to get a filter missing the O-ring. The nuts just need to be good and snug. They are easy to wring off, so a small 1/4" ratchet on the 10MM cap nut with one finger on the handle would tighten them nicely.

[Maddevill]

Just get the jet change out of your mind. Nothing done in or around the carbs will cause an oil leak. It's just a coincidence that the leak started after you fiddled with the carbs.

[mrbill5491]

Either the seal went bad and/or the filter cover came loose. Where is the oil pressure sensor located on a 79 750? Is it located on the filter cover? If so, check that they go bad as well and will seep oil. The one on my 80 750 did.