Oil issues

[SteveW]

Today is the first time I've taken my 550 K0 out for a decent ride since getting it registered.

Normally oil pressure light goes out the minute the engine fires.

Done about 50 miles, but noticed that after about 15 miles the oil pressure light would come on at anything below 2000 rpm.

Let it cool down for an hour and it was back to normal, oil light goes out the minute the engine fires up.
Rode around a bit more and its starts doing it again, oil light on below 2000 to 2500 rpm.

Using 10W 40 oil, oil was only changed 100 miles ago.

Engine sounds normal, bike performs normal.

Seems as if the oil is becoming too thin in the hot weather?

[K2-K6]

Just a quick,  and cheap, check. If it's been run a fair bit cold and on choke then have a sniff of the oil to see if it smells much of petrol.

It changes the viscosity quite quickly if it has been diluted in this way.

[SteveW]

Just checked and it does smell a bit of petrol.

When I first got the bike, it had been sitting in a barn for years. When I first drained the oil, it really stank of old fuel.

Wonder if there is still some old fuel circulating in there.

Think I'll do another oil change this weekend.

Also whipped one of the tappet covers off, plenty of oil up there so I guess the oil pump is ok?

[Bryanj]

Worth trying a different sender, they do go after time

[JamesH]

Sounds like an intermittent oil pressure sensor to me, but good to err on the side of caution as you’re doing..

[Trigger]

I would pop the oil pump off, get a new o'ring kit from Nurse Julie and fit a new switch 

[SteveW]

I would pop the oil pump off, get a new o'ring kit from Nurse Julie and fit a new switch 

Is that a straightforward job, changing the o-rings?

[deltarider]

Worth trying a different sender, they do go after time

+1
No need to renew pump O-rings, if there's no sign of leaks.

[Nurse Julie]

Worth trying a different sender, they do go after time

+1
No need to renew pump O-rings, if there's no sign of leaks.

The oil pump is like the human heart, parts start wearing out and leaking after 40+ years but you don't know you have a problem until, possibly, it's too late. Agree, fit a new sender unit, most probably the culprit.

[SteveW]

How much for a set of o-rings? Might as well replace them.

[Nurse Julie]

How much for a set of o-rings? Might as well replace them.

I have them on my eBay page for £7.99 but do them for £7.00 inc post to forum members. I also have the oil pressure switch in stock for £14.99. Don't feel obliged to buy them from me though.

[SteveW]

How much for a set of o-rings? Might as well replace them.

I have them on my eBay page for £7.99 but do them for £7.00 inc post to forum members. I also have the oil pressure switch in stock for £14.99. Don't feel obliged to buy them from me though.

I'll take a set of o-rings and a pressure switch, can you PM me your details, thanks 

[Nurse Julie]

How much for a set of o-rings? Might as well replace them.

I have them on my eBay page for £7.99 but do them for £7.00 inc post to forum members. I also have the oil pressure switch in stock for £14.99. Don't feel obliged to buy them from me though.

I'll take a set of o-rings and a pressure switch, can you PM me your details, thanks 

PM sent

[sgd37]

Hey Julie could I get a set of O-rings as well?

[Andych]

Can you PM me details as well pls Julie.