bbolesaz Posted September 29, 2017 Share Posted September 29, 2017 So, after the 25 mile ride to work, I get off of the bike and notice a trail of oil drops behind the bike. A quick look underneath confirms the puddle forming under the bike. It looks like the oil is originating from the top of the motor, running down the sides and then dropping off of the rear of the oil pan. I had the tank and air box off recently. I'm suspecting I put a crack in an oil hose in that process. Can someone explain the oil path in and out of the frame? I'm guessing the frame forms a breather / sump function. Further guessing that the hose from the top of the motor to the top of the spine is the engine breather outlet and the hose from the rear of the spine to the oil pan is the return. Hose at the top of the spine is the atmosphere line. Any other place on top of the motor suspect for puking oil? Link to comment Share on other sites More sharing options...
Chuck Posted September 29, 2017 Share Posted September 29, 2017 Sure, the pressure lines to the heads will leak a lot of oil if either they or the fitting fails. That's fairly common. The phase sensor and oil pressure sender can leak, but not normally a lot.. The breather line is a good bet.. it will make a mess. Link to comment Share on other sites More sharing options...
stewgnu Posted September 29, 2017 Share Posted September 29, 2017 The crank sensor can piddle some too. Link to comment Share on other sites More sharing options...
bbolesaz Posted October 1, 2017 Author Share Posted October 1, 2017 Yep, it was the breather hose that cracked. The crack wasn't quite as big as shown below, it got bigger when I pulled the hose off of the tube. I cut the ragged end straight and replaced it on the tube. Link to comment Share on other sites More sharing options...
luhbo Posted October 1, 2017 Share Posted October 1, 2017 Don't dispose it. It's a nice strong multi purpose rubber hose. Link to comment Share on other sites More sharing options...
bbolesaz Posted October 1, 2017 Author Share Posted October 1, 2017 So, my temporary fix didn't work. I was on the way to the Arizona MCNOC breakfast doing about 80 up the I-17 when the bike turned into a smoke cloud. It was blowing oil out much faster than it did the first time. I pulled off into a parking lot and watched it drip a monster puddle. The breather hose had completely seperated just above the engine tube and the engine tube was an oil geyser. It wasn't so bad if the engine RPM was less than 2500, so I limped it home short shifting and going slowly. I grabbed a couple of bottles of oil along the way to make sure the red light didn't come on. So, I have a new breather hose on order. Now I'm starting to think (always a bad thing) that maybe I have a problem with the breather. I assume that there should be easy airflow from the engine breather to the outlet at the top of the frame. Haven't had a chance to check it out yet. I'm hoping that it's just that Luigi used some cheap pasta to make the original hose. Link to comment Share on other sites More sharing options...
docc Posted October 1, 2017 Share Posted October 1, 2017 Those hoses are exposed to some nasty chemistry and just go bad after a while. You do have the factory airbox and the hose that connects the top front of the spine to the airbox? Link to comment Share on other sites More sharing options...
gstallons Posted October 2, 2017 Share Posted October 2, 2017 I am blank . Is this a vented crankcase or closed ? These are cheesey ( sp? ) hoses and everyone needs to keep an eye on them . It is not the hardest job to do but if the assembly line clocked the hose clamp wrong , you are in for a JOB ! I know . Remember this when you reinstall EVERYTHING but the alternator cover doing this . Link to comment Share on other sites More sharing options...
gstallons Posted October 2, 2017 Share Posted October 2, 2017 BTW , you need to reassemble / install every bolt & part like it is going to come back apart someday . Link to comment Share on other sites More sharing options...
bbolesaz Posted October 2, 2017 Author Share Posted October 2, 2017 Yep, I have the factory airbox and that hose. Maybe that hose is getting crimped somehow? When I get the new breather hose and it is still clean, I'm going to hook up the spine end and make sure I can blow air thru the system. Link to comment Share on other sites More sharing options...
docc Posted October 2, 2017 Share Posted October 2, 2017 I am blank . Is this a vented crankcase or closed ? Visible at the top right of this view of the back of the engine case is the actual crankcase vent that the hose fastens to : Link to comment Share on other sites More sharing options...
bbolesaz Posted October 2, 2017 Author Share Posted October 2, 2017 Yep, that's the breather in the motor. And for the fun part ? See that gap between the metal breather hose fitting and the case? Yep, as the breather is puking oil all over, some of it is running down that gap and contaminating the bell housing with oil. Clutch is still operating normally, but . . . Link to comment Share on other sites More sharing options...
docc Posted October 2, 2017 Share Posted October 2, 2017 The clutch is contained pretty well within the flywheel and not likely to get ruined from that venting failure. By removing the starter, and the right side inspection plug, you can clean all that out with a spray solvent like Electronics Cleaner. There are only six or eight other places it can leak inside there . . . Link to comment Share on other sites More sharing options...
coreytrevor Posted October 2, 2017 Share Posted October 2, 2017 I am blank . Is this a vented crankcase or closed ? Visible at the top right of this view of the back of the engine case is the actual crankcase vent that the hose fastens to : It's obviously far too clean inside that bellhousing! Are you trying to make the rest of us feel inferior? Link to comment Share on other sites More sharing options...
bbolesaz Posted October 2, 2017 Author Share Posted October 2, 2017 Is there a drain hole at the bottom of the bell housing? Link to comment Share on other sites More sharing options...
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