I've bought this old 1989 Softail Evo. It's been sitting long, there was some condensation in the old oil.

I drove the bike for 10 mins. when I first started it with the old oil. Oil light was off during this time.

Then oil lights goes ON.

Then we changed filter and oil.

Oil light was still on.

We checked the oil-pressure-contact, and it seemed to turn work fine, when unscrewed and tested.

What would be the obvious cause for this, when taking into consideration, that the bike has been sitting for a long time. Where do we start?

 

Have you verified that you actually have pressure with a quality, known gauge?

 

Tappet screen could be blocked, OP sender could be faulty, manual testing the sender will tell you jack.

An oil line could have collapsed, the pump could be shot.

I would do the following in this order.

Clean tappet screen.

Substitute OP sender

Replace oil lines

Look into pump

Unless something else jumped out at me during the process.

 

Thanks for the quick replies. Will get to work. Nice to get a good head start on this problem.

 

I would change all the fluids on that bike.

 

Pressure regulating valve in oil pump could be stuck open, from trash or corrosion from setting up.

 

Yep, sure can.

 

If yuos ain't careful, you bike blowwd up.

 

Why would anyone run an old barn find engine with original oil in it and ask why there is no oil pres.?

 

well if you have seen any of the films U tube of the self impressed Morons that pull barn finds panheads knuckelheads and fire them up and hold the throttle wide open and than throttle jerk them just to make sure they wreck everything that has no oil on it -- i seen them do it have you ?????