I was out for a ride (15 or so bikes) the other day and a friend of mine and I broke off early. We took the highway home and were beating our bikes up pretty good. Fast wheelies, standies, 150mph plus runs, in and out of traffic.

Well anyway when I pulled into my parking lot the bike started acting wierd. I went to clutch up a first gear little wheelie and the biked bogged on me. Then, whenever i hit the throttle, it would die.

Now the bike wont start and I'm pissed. Tried choke on choke off, nothing. When I opened the tank to see if my fuel somehow leaked out, a ton of pressure escaped. There was still lots of gas so i tried to start it again and it started right up.

Happened to anyone else???

:wtf :wtf no, but dat sounds ****ed up!!!!

You might want to check to make sure the tank breather hose (I think that is the proper term for it) isn't obstructed. The tank shouldn't build up that much pressure, so it probably is.

I had the same problem this past weekend. I had 3/4 of full tank and we were hitting the twisties reving at about 10k for a while and the gas started to not work. i started to slow down pretty bad, eventually the gas didnt even work. So i pulled over and checked my gas. the tank was full of pressure and when i opened the lid there was a pretty good suction. after that my bike was fine. my guess would be that the pressure prevented the fuel pump from getting any fuel. I dont know if its normal for gas to do that but i hope nothings wrong with my bike.

When you get vapor-lock, you are usually having one of the two happening.

1. Tank vent plugged, causing fuel vapors to push into fuel lines instead of liquid fuel. (pump doesnt work very well when pumping vapors)

or

2. Either the weather, or engine is producing so much heat that the tank and or fuel lines are getting kind of cooked which is heating the fuel, creating WAY more amounts of fuel vapors, so much that it pushes out both the fuel lines and tank vents. This is what both of you guys ran into. Some bikes get a cool whistle effect like a tea pot, these bikes won't have problems in most cases, but a bike sitting next to it that isn't whistling, just simply isn't vented as well, hence no whistle and possible vapor lock.

Gasoline will give of vapors at any temperature above like -46 degrees F, that's fricken cold, now think of a 200+ degree engine cooking the tank and lines and the amount of pressure you can build with vapors.

jees

That's exactly how it went down for me.

It has happened twice now

Red,

Where is the tank vent and how can I check it??

Too much pressure in the tank may boost the fuel pressure causing a super rich mixzture and a resulting bog like you guys are describing. Hot temperatures combined with the sun beating down on the tank just heats it up more. Ever get the cool feeling between your legs after you fill up with gas :?: :ot

jas - yeah it sucks, i thought i'd get stuck out on the road. it was a phat ass relief for have it start up again. I'm guessing it happen due to head because it was hot that day and i was reving around 10k+ for a while so the engine was working. However i have seen a little puddle around the end of my pipe at the hole after a long warm up. i dont think it happens all the time though. As soon as someone gives us some directions to check it its clogged i'll check it out.

Yea, there's gotta be something wrong or clogged or something. These engines are designed to take abuse far greater than you or I can possibly give them on the street (although we try).

I'm taking the bike apart this Saturday and I'll check into all the hoses and what not.

Your tank is vented right by the fillcap. The '03 has a hole right in front or back on the top side. Tanks also have an overflow line that should allow some venting.

You guys are probably fine, just got caught on a damn hot day, running the engine really hard :hump

Sorry forgot to mention it, but how much time during the riding were you spending draggin knee? Your tank vent won't vent when the gas and vapors are in the top, but side of the tank. Make sense?