Riding down the highway when i hear a 'pop' sound and then oil hitting my leg.. and then the white smoke building as the oil hits the hot engine. Pull over. Turn of the bike and clean the oil up with a rag. No leaks. Turn it back on... instantly starts leaking at about 1ml per second or so.. from what i can see around the front near where the exhaust pipe exits the engine. With no tools to remove the fairing and double check properly i left it in an ally way and headed home by other means. I plan to go back tonight. I would ideally like to drive it back home... (3-4km drive).. could this be done? Im thinking i blew the right side gasket?

Specs:

2007 GS500f, KnN lunchbox filter, rejetted (22.5 67.5 155) and slip on pipe.

Pop noise hit when it was at about 120km/h on 5th, so maybe ~6k rev.

What do you think.

Also let me add, the engine works fine. Put it on the kick stand and ran it though and the engine responded fine... its just the leaking.. and its leaking at a large amount.

Did you happen to get a pic of where it's leaking? I don't think it was a head gasket.

I Will get a picture up tonight, because I'll take my tools with me and remove the side fairing so I can actually see what's happening clearly then I'll put up a picture.

Ok Update: I havnt had a chance to get good pictures tonight but i managed to ride it a 2-3km down the road to a mates mechanic, unfortuantly it was late so no one was there. But at least 500-100ml of oil drained out and onto my legs and all over the road on my way down, the oil light never came on so i didnt bother stopping to top it up with out. The engine runs fine, hit 100km on it up to 5th gear without a problem. Only problem is the oil leaking. Tomorrow during the day i will try find the source of the leak, but until then, any brainstorming on possible reasons?

Quote from: Mr.Rose on February 28, 2012, 12:24:58 AM
I Will get a picture up tonight, because I'll take my tools with me and remove the side fairing so I can actually see what's happening clearly then I'll put up a picture.

Ok Update: I havnt had a chance to get good pictures tonight but i managed to ride it a 2-3km down the road to a mates mechanic, unfortuantly it was late so no one was there. But at least 500-100ml of oil drained out and onto my legs and all over the road on my way down, the oil light never came on so i didnt bother stopping to top it up with out. The engine runs fine, hit 100km on it up to 5th gear without a problem. Only problem is the oil leaking. Tomorrow during the day i will try find the source of the leak, but until then, any brainstorming on possible reasons?

Backfire was random, and it was leaking before the backfire.

Valve cover gasket, or base gasket. It would run like ass if you pooped a hg.

The pop wasnt backfire, it was a deep pop sound, like pressure build up releasing. Sounded like a pressure release valve blew. I Will have a better look at it during the day tomorrow with the fairing removed. It leaks just on the right hand side. It never leaked once before hand. I feel like i may have over filled the oil when i serviced it 3 weeks ago, and the pressure just built to high and something gave.

Where was it getting oil on your leg?  By your knee or your ankle? 

If it was coming towards your knee, I want to say it was the valve cover gasket.

It was hitting my ankles only on the drive. It seemed to be leaking from the same place as the soiled patch on the engine block in this picture from beergarage

http://beergarage.com/imgs/GS/HeadOff/01.jpg

Though It was dark and hard to see, so I'll clean the engine properly tomorrow and double check.

There is an oil channel that goes down the cylinder studs and through the head gasket. The edge of the head gasket could have blown there and not effect performance. Until you run out if oil of course.......

Clean it up, throw some baby powder around it, and run the motor a little bit. Any oil will show up real quick in baby powder.

The bike can run with a head gasket leak, it will also run with a base gasket leak. I have had a GR650 that did. Near identical motor to the GS.
Cool.
Buddha.

In other news, motorcyclist dies after sliding out due to oil on the road and sliding into a light pole. Film at 11.

120kph in 5th is closer to 7k rpm. 6k in 6th at 120.

Michael

Quote from: mister on February 28, 2012, 12:20:00 PM
In other news, motorcyclist dies after sliding out due to oil on the road and sliding into a light pole. Film at 11.

120kph in 5th is closer to 7k rpm. 6k in 6th at 120.

Michael

Trust me that thought never left my mind. Luckily all the oil hit my right leg and flung off rather than down onto the tyres, the joys of burning hot oil all over your shoes.

Lets see if i can diagnose this problem today after work.