I've only seen a few topics here about this issue, but have never really been able to find a definitive fix.
The last few months, occasionally on a cold startup, usually the first startup of the day, I will start the bike, get it running and warmed up a bit, and then once I go to take off the oil light will come on. At first I just burped the filter every time it would happen and all was well until the next day would roll around and the bike would do it again.
I got sick of this happening so I tried a Bosch oil filter rather than the Supertech (WalMart) filter I had on before. Seemed to help alleviate the need to burp the filter, but it still the oil light would come on when cold after taking off and I would have to blip the throttle to 4k RPM to set it straight, sometimes 2 blips.
Filter helped, but not perfect, so I put 1/4 can of Seafoam in the oil and rode the bike out of town for a weekend, covering approx. 350 miles. All weekend, same thing, oil light off when starting, comes on on the first takeoff, blip it to 4k RPM and all is well after that.
Coming back from the weekend I drained the seafoam oil, cleaned out the oil pressure switch with carb cleaner, added Shell Rotella T4, primed and burped the filter, and it's STILL THERE! Start bike, oil light off, warm it up 20-30 seconds, take off, oil light on, rev to 4k, oil light off for the rest of the day.
Oil pressure switch gone bad? Oil lines still clogged after 1 seafoam treatment? Not warming it up long enough? What do you all think might be my next step here?
I'm almost just resigning myself to having a finnicky cold blooded bike, but I'd LIKE to not have to worry about oil pressure so that if somebody else wants to take my bike for a spin they don't have to worry about it (my bike gets off the line faster than my dad's Heritage Softail so he likes to ride it when I go back home