Broken hose identification

Hi guys, noob here again. About a week again I dumped by 1980 kz650e. It ran strong up until today when it kept staling out on me and sounded like the engine was kind of labored. Ended up pushing the bike home and when I did I noticed a hose towards the back of the bike near the rear wheel had snapped and was leaking a dark substance (I think my engine oil). Does anyone know what this hose is for and what the correct name of it is? I checked my manual and it's not identified. I want to go to my local cycle gear store to see if they have a replacement.

If it is still connected, check to see where. It could be the airbox drain tube. If you have pod filters, it could be from the crankcase vent (breather cover). When you dumped the bike, I'm guessing oil could have gotten into the airbox. Be sure to check the engine oil level - motorcycle preferably on the center stand & level.

nice bike...sorry it hit the pavement.

Did you smell it to see if it had gas in it?

Do you have pods or factory air-box? If you have air-box...oil got into it while on side and drained out though tube when upright as it was designed to.

I have air pods.

A few corrections: the hose I was referring to did not snap and the "hose" I was referring to is one of the vacuum hoses that comes out of the carborator.

I believe you guys are right. Engine oil (not gas) must of leaked into the carborator when I dumped the bike. Weird thing is I dumped the bike a week or so ago and have been riding it since without problems. I guess it just took some time to work out.

Any remedy for this, or if I just run the bike and let it work itself out the best and easiest thing to do?

The hose is pretty small- looks like a carb overflow hose to me.

For curiosity's sake I'd probably drain the carbs into a clear plastic container & examine whatever comes out.

Since you have pod filters, is there a crankcase breather filter or is there a vent tube routed similarly to the one in the photo?

Not to change the subject but.....You about to lose your kickstand!!!

The pivot bolt is backing out, and it is missing the locking nut on the backside of pivot bolt!

Dr. Gamma wrote: Not to change the subject but.....You about to lose your kickstand!!!

The pivot bolt is backing out, and it is missing the locking nut on the backside of pivot bolt!

Good eye there i seen that too!

Are you sure that its not gas leaking? As when it drips onto pavement it dissolves the pavement, making black oil. When the bike fell/ dropped, you might have gotten some junk into the fuel inlet to the carbs. Then the needle and seat for the float valve got some junk in it, causing the fuel level to overflow. That looks like the carb overflow tube.

Been doing some diagnostics and here is what's happening:

1. I start the bike in neutral with the choke all the way open. When I do, the bike goes to 4rpms. I let it idle for about a minute then I close the choke. About two seconds later, dark oil comes streaming out of one of the carborator hoses. The bike did this for about four or so times today...and still is doing it.

2. A new problem developed, I'm getting flames shooting out of my exhaust pipes when they backfire and I have gas leaking from my air pod closest to the kickstand side of the bike. The gas will continue to drip when the bike is off too.

3. Dr. Gamma thanks for the kick stand tip!

Any ideas what's going on

danpcali wrote: ... have gas leaking from my air pod closest to the kickstand side of the bike. The gas will continue to drip when the bike is off too....

Float valve is mal-functioning for whatever reason.

Gasoline rising up into the carb bore has likely also flowed forward into the combustion chamber and down past the pistons into the crankcase.

Would sniff-test the crankcase oil and examine its physical condition, as it may have become diluted with gasoline.

Would not run the engine until the problem has been resolved, and the oil and filter changed.

Good Fortune!