HM 796 won't start after spirited ride. - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 11 (permalink) Old Aug 16th, 2018, 2:34 pm Thread Starter
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HM 796 won't start after spirited ride.

Hi guys. I'm struggling with my HM796. It's got 21k miles and a few months ago it began to start slowly after a spirited ride. And for a few times it stranded me in the road. So basically after a ride that has her revving a bit more, it won't start if I happen to shut the engine off.

I took it to my local mechanic, he replaced the solenoid, but a month later the problem came back. He checked the sprag clutch, the charging system and the only two faults he found was that: the lambda sensor in the back is malfunctioning and the voltage doesnt spike as much when he revs it. The bike's been in the shop for over a month and I'm missing out riding season, I'm thinking about taking the bike to Ducati, maybe they'll find the issue quicker. I've never taken a bike to the maker because all my bikes have been used.

Here's a video, what do you guys think it might be?

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post #2 of 11 (permalink) Old Aug 16th, 2018, 4:24 pm
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These bikes have a tendency to rattle the battery terminals loose, I'd make sure those are checked but a shop surely shouldn't miss that.
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post #3 of 11 (permalink) Old Aug 16th, 2018, 5:30 pm
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While your checking the battery terminals...try putting in a known good battery. I would bet your battery is toast.
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post #4 of 11 (permalink) Old Aug 17th, 2018, 9:32 am
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Yep!
Agree with mlukason. I had to replace the battery twice during my ownership of the 796 (~6 years). I thought for sure something else must be wrong so I bought and replaced the starter solenoid (which didn't solve the starting problem... the battery replacement did)

Some folks end up upgrading the heavy gauge starter wiring loom with an even beefier wiring kit... this can help if your battery is weak, but fundamentally if the battery can't push the amps, the voltage drops and ECU reboots like in your video.
J
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post #5 of 11 (permalink) Old Aug 17th, 2018, 10:42 am
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Quote:
Originally Posted by mlukason View Post
While your checking the battery terminals...try putting in a known good battery. I would bet your battery is toast.
Plus two.

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post #6 of 11 (permalink) Old Aug 18th, 2018, 8:47 am Thread Starter
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Originally Posted by mlukason View Post
While your checking the battery terminals...try putting in a known good battery. I would bet your battery is toast.
My guy said he connected the battery to a machine that said the battery is healthy. Can it still be toast?
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post #7 of 11 (permalink) Old Aug 18th, 2018, 9:33 am
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Originally Posted by Scarfall View Post
My guy said he connected the battery to a machine that said the battery is healthy. Can it still be toast?
Yes, these bike take quite a kick to roll over. Much more then your average inline. Put the multi meter on the battery as you start the bike. If it falls under 9v while trying to start, you need a new one.

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post #8 of 11 (permalink) Old Aug 18th, 2018, 9:39 am
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The ECU needs a certain voltage to operate, if it goes below it shuts down completely.


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post #9 of 11 (permalink) Old Aug 27th, 2018, 9:01 pm Thread Starter
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I picked up the bike today and it seems asymptomatic, but I shouldn't br celebrating so soon. So my local mechanic checked all the wiring, removed the flywheel and had a look at the sprag clutch. There was a block connector that was all fried up so he replaced that. I had a faulty lambda sensor so we got a new one.
L
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post #10 of 11 (permalink) Old Aug 28th, 2018, 1:57 am Thread Starter
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Nevermind, I spoke too soon, it's still fucked. I'll just take it to Ducati to fix it.
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