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Old Sep 3rd 2019, 10:31 AM   #1
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I Ride: 2016 HyperMotard SP
939 SP Leaks Oil During Wheelie

Hope everyone had a safe and fun weekend. I was very lucky and got to ride the Tail of the Dragon over the weekend on a work trip so that was fun!

So just a quick background on myself I am currently a test engineer for an automotive company called Local Motors we are currently in production of building self driving electric buses called Olli. My background is mostly aerospace engineering motorcycle and automotive mechanics and fabrication as well as a washed up stunt man for the entertainment industry. I specialized in sport bike riding and aerial maneuvers. Ive been riding street motorcycles for 17 years and have owned over 12 bikes and worked at a few dealerships and ran a shop out in California for almost 5 years.

So Im having an issue with my Hypermotard 939 SP. When I wheelie the bike for any sort of distance whether it be a city block or mile, the bike leaks an excessive amount of oil from the crankcase breather. So the first instance it happened I did maybe a wheelie for 1/2 mile and when I set the bike down I didn't notice anything bad till I tried to set my foot down at a light and almost slipped and dropped the bike. When I looked down I notice the air box drain tube was pouring oil and my rear tire and swingarm were heavily covered in oil. I couldn't believe it! SO I pulled over and tried to whip it all off the best I could so I could get home to pressure wash it and wipe the bike down.

After the first incident I tried to do something Ive done before when stunt riding motorcycles or having to do wheelies for a long period of time. I took off the crankcase vent tube and plugged the inlet to the airbox from the vent and ran an extension tube all the way up to the neck of the bike and placed a tiny air filter on the end of that hose and tested to see if that helped. It helped a little but oil still was puking out the air filter over the front of the bike and on to the front fender and tire. Not as much as the previous incident but still enough to be concerned.

SO next I developed a catch can system for the bike and placed a 400ML catch can where the charcoal canister use to be located and ran the hose from the crankcase breather to the front right hand side of the bike to the inlet of the catch can, blocked off the outlet of the catch can and ran a breather hose from the top port of the catch can to neck of the bike with a small K&N filter and completed a test run. The bike didn't leak any oil but after look at my oil catch can after maybe doing a wheelie for 1 city block the catch can had almost 200-250 ML of oil in it. So I would just empty it after each ride back into the bike and let that be that.

But a few weeks ago the bike created so much crankcase pressure that it spit out my countershaft seal behind the front sprocket and poured about 2 quarts of oil out of this bike while I was doing a wheelie. I took it to the dealership and told them their has to be a high crankcase issue with this bike I should not be experiencing these problems. Ducati has a video advertisement for this bike with stunt riders doing wheelies and stoppies on the bike. Something cant be right. Well Ducati approved the warranty work for the seal but the techs came back and said the crankcase venting system appears to be operating correctly.

Now I know there will be some of you out there that will tell me "than stop doing wheelies" or "grow up" if your one of those just move on no matter what you say Im gonna do what I want to do when Im enjoying my ride and at that moment in time if I feel like doing a wheelie guess what that's what Im going to do so you can just move on to the next post. If you are someone that could shed some light or experience with controlled wheelies in 1st and 2nd gear at constant speed with no acceleration for a distance longer than 1 city block I would to love to get your feedback if your bike leaks oil like mine does.

Any Help would be appreciated. Im looking into other return oil methods currently but just seems like a lot of hassle. Ive experience this issue with almost none of the 12 or so bikes Ive owned during my 17 years of riding street motorcycles. Only one bike Ive heard of having a similar issue which was not this exaggerated and that was on a Kawi 636 stunt bike.

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Old Sep 3rd 2019, 11:43 AM   #2
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I Ride: Anniversario l Hypermotard 939 SP
I have no relevant feedback because I can't wheelie for shit. I know, that is half the fun of owning a Hyper. I Can cartwheel several times doing 100+mph and can happily report that it didn't leak a drop off oil.
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Old Sep 3rd 2019, 05:25 PM   #3
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Originally Posted by RetardedTiming View Post
I have no relevant feedback because I can't wheelie for shit. I know, that is half the fun of owning a Hyper. I Can cartwheel several times doing 100+mph and can happily report that it didn't leak a drop off oil.
Hahahaha do I even want to know what happened! Might not of leaked oil but was it rideable? Lol
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Old Sep 3rd 2019, 05:42 PM   #4
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I Ride: Anniversario l Hypermotard 939 SP
Out lap, cold morning at Buttonwillow, cold tires (no warmers at the time) and wanting to catch up to a buddy. Definitely wasn't rideable after. Silly mistake I won't make again and she's all rebuilt now.
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Old Sep 4th 2019, 02:02 AM   #5
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Great write up and explanation. But since I don’t own a Hyper, little difficult to visualize. Do you have pics?

I did have oil leak from the breather hose at the track and got all over my swingarm and rear tire...and like you didn’t notice until I stopped in the pit area. I noticed my breather hose to engine case was cracked/ripped and thus oil was coming out.
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939, 939sp, leak, leaks, oil, wheelie



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