This is my first post here. I'd appreciate if I could get some advice. I just bought a 2013 GRiSO and 10 minutes into the ride home, in hot city traffic and hot and humid weather, saw the oil pressure warning light come on briefly and then turn off. After some more experience with it, here is how it happens:
It's always fine when riding, and always fine when idling, and always fine for the first many (10 or more) minutes after riding on a cold engine. If you blip the throttle at idle (whether stopped or at speed putting it into neutral), it comes on as it hits 1500rpm. It also comes on after coming to a stop, idling, and then accelerating, as the needle hits 1500rpm. It then turns off shortly after by around 2000rpm. It also comes on if you ride it slowly in gear at 1500rpm, whether from idle, or slowing down from a higher speed. Again, once it passes around 1700-2000rpm, it shuts off. Or if you blip the throttle while idling, past the 1500rpm mark, it comes on and stays on until you get it past the 1700-2000rpm.
No weird sounds from the engine. The previous owner had not ridden the bike in the couple of years he owned it so he wouldn't have known about it. He kept it stored in a pristine garage. The problem either started in the time the bike was stored or perhaps the owner before that had seen it.
After I got home, I noticed that in the box of stuff I got with the bike included a ziploc bag with a brand new oil pressure sensor. I did my research on the board and found that this could be the culprit and wondered if the original owner (prior to the one I bought it from) had been getting ready to replace it or if he just had it as a spare.
So I installed the new sensor. The problem looked solved after a longer 25 minute ride in the country (no traffic) with plenty of stops, idles, 1500rpm tests etc. But then, just as I was pulling back into the garage victorious, bang! it came on at 1500rpm.
I'm not sure what to do next. Could the oil pressure switch I found in the bag be bad (it was brand new)? Should I buy another?Could it be a wiring connection issue? Is the next thing to try, to replace the upper gasket in the sump (as I read on the boards)? Or should I take it to a dealer to have them check the oil pressure and perhaps change the oil pump if that is the issue?
Thanks -- your help is much appreciated.