Engine Hot, Oil lamp Burning, Engine shut off

[GS500e 1989 Brabant]

Hello all,
I was driving last weekend and I had some troubles with my GS500e from 1989.
I was driving about 1 hour and all of a sudden de engine stalls a bit around the 5k rpm. I stopped and checking if there was still gas floating to the carbs. Everything seems to be alright. So I continued driving.
10 minutes later, I lost all power and the rpms dropped down to 3k also the engine shut off and the oil lamp was on.
I checked the oil level first and 15 minutes later, there was enough oil but the oil was hot.
After another 10 minutes I started the engine and. The oil lamp shut off, I was able to drive home on a low rpm. (nothing seems to be of, but I was very careful. No strange noises, Etc.)
I will change the oil and oil filter today and later on I will swap the pilot and main to 40 and 147.5 for more power and cooling.
Is there something else I can do to keep this from happening? And why did the temperature got so high?
(p.s.) everything is stock except the exhaust. I was driving with the petcock on prime the bike runs better on that mode.

Thank you in advance!

[Bluesmudge]

The oil lamp comes on whenever the ignition is on but the engine isn't running. The oil lamp should turn off as soon as you start the bike. If it doesn't you have dangerously low oil pressure.

Were you running at highway speeds when the bike died? Did it bog down, like running out of fuel, or did it just cut out?

[mr72]

I'll have to point out, if you have to ride it on PRI then you probably may have a vacuum leak, which may also cause the bike to run very lean, which will cause it to overheat after sustained riding. That sounds like what you are experiencing.

Fix the problem that is causing you to run it on PRI, you know that something is wrong there so start there. Then see if your other issue continues.

[GS500e 1989 Brabant]

I was driving on a local road.
speed about 80-90 Km/h, rpm about 7k, 4th gear.

Thanks for the vacuum tip, I will check it today as well.
I will keep you posted on the outcome!
Thanks for your help

[GS500e 1989 Brabant]

Hi all, i really need some help or tips, 
I've changed the oil, oil filter, fitted new sparkplugs, repaired the vacuum hose, and changed the jets.
First I changed the jets to:
Main Jet : 147.5
Pilot Jet : 40 (bleeded)
And 2 washers under the needle.
That was to rich and the bike didn't run smoothly.
On the second try I changed the jets to:
Main Jet 127.5
Pilot Jet 37.5 (Not bleeded)
And no washers under the needle.
On the first hand it did run smoothly. But when I took it out for a spin, everything seems O.K. but the bike got stubborn around the 2k rpm and 5k rpm. This got stubborn acting got a bit worse and the bike overheated again and shut down.
I don't know why the bike got so hot and what the correct jetting is for my bike. I drove on the main setting on the petcock. And not for a very long time. I also fitted a new competition racing pipe of the brand Yoshimura with a Db killer.

[The Buddha]

I suspect your problem is the crank trigger. If it starts up without any bad noises and runs a bit and loses a cyl, etc - that is crank trigger. Right side under that round cover 2 inductive pickup's and the advancer spinning off the crank. Those pickups when they get hot, don't "pickup" the advancer's nose as it flies by.
Cool.
Buddha.

[GS500e 1989 Brabant]

Thanks Buddha,
but why did it get so hot? I never had this problem before.
I thought that it was too lean and that the gasoline doesn't cool the engine.
And why does the bike act so stubborn on the 2k an 5k rpm? It also backfires a bit on these rpms.

[The Buddha]

Thanks Buddha,
but why did it get so hot? I never had this problem before.
I thought that it was too lean and that the gasoline doesn't cool the engine.
And why does the bike act so stubborn on the 2k an 5k rpm? It also backfires a bit on these rpms.

Are you sure it over heated ? Because bikes that die from over heating don't simply start back up a bit later and run like normal. They usually seize up and don't just start back up without making lots of noises etc etc.

So did it run fine with the first jets you had in it - 40, 147.5 ? Then put those back in.
And what air filter you running. Pipe is yosh I see that. If stock filter, 125/40, no way it would run normally with 147.5. If you had a K&N clamp on, 147.5 is close enough it may be fine. 150/40 is better.

2k-5K problems are jetting - you have some issues there for sure - there's no way 147.5 to 127.5 is even remotely right to swap in 1 swoop.

I suspect your problem is that crank trigger - it can go bad with normal engine operating temp, or before it even gets that warm.
Then you randomly swapping jets caused your next set of problems.

PS: I see you said everything is stock in your first post. So 40 non bleed and 125 are the right jets for it, which was what you were running. That's what you need to run, 147.5 as you found out will not let it run. If you had 127.5/40 Just use that its close enough and as cooling as you can get with jetting alone. So don't start creating more problems, your issue I'm sure is electrical, crank trigger died.

Cool.
Buddha.

[GS500e 1989 Brabant]

He Buddha thanks for your help.
It is an original air filter. I found somewhere on the internet that could fit the 147.5 main jet. Apparently not, I will fit one washer underneath the needle. Maybe it gets better. But coming back on the crank trigger problem. How do I check it out? How do I know it's  broken. I just started the bike, and is doesn't seems like it skipping of or misfiring.
I see you know a lot more of this bike than I do. I really appreciate it!

[GS500e 1989 Brabant]

Hi all,
I put the stock jets back and it only runs in prime mode, I've driven for about 10 minutes in prime. No difficulties, only bit slow on rpm (I do prefer high revs and sporty driving)
But if I try to run the bike on the normal petcock mode the bike is very stubborn and doesn't get higher than 5k rpm.
Could it be that there is a problem with mine petcock?
Thank you in advance!

[The Buddha]

Runs only in prime = Vacuum line is bad. But with it in on/res you only get 5K ? Yea problem with petcock.
What you mean "bit slow on rpm".

Cool.
Buddha.

[GS500e 1989 Brabant]

I've changed the vacuum hose, the older one was cracked.
on the mode on or res. the bike doesn't get any higher than 5k rpm, and backfires a lot. It looks like a fuel starvation.

Slow on RPM I mean that in the earlier days it was a bit quicker from 2k to 12k. now on prime it takes a while.
Thanks Buddha for your help. It helps a lot for troubleshooting.

[The Buddha]

Lets fix 1 thing at a time.
OK so it doesn't shut down as it warms up. Good, so the crank trigger can be eliminated. I'm not sure how you had that issue in the first place, usually trigger going bad get 1 cyl to drop out.

5k with misfiring and fuel starvation is your only symptom now.
So this may be starvation, true, but is it stalling at 5k in prime and in on/res ? Then if its poor flow its one of the 2 petcocks.
Does it happen at 5K even when idling ?
Have you routed the vent hoses to the carb right, they're not pinched or plugged ?
How does plugs look.

Cool.
Buddha.