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Crazy Fueling Problems - 2016 Hyperstrada 939

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1-3-2-4

Joined Jun 2022
56 Posts | 11+
Bangor, PA USA
First post here as a member, but I’ve been lurking for a bit. Finally bit the bullet and bought my first Hyperstrada 939 a few days ago. I’m an experienced rider with well over 100K miles on the street and thousands more on the track. Also owned a MTS1200 for a few years, so not my first Duc.

With that intro aside, I have some wilding fueling on this engine. There’s about 12k miles on the clock and bike is in mechanically good condition. Completely stock engine. It feels SUPER lean at low loads/throttle openings. Feels nice and crisp at larger loads. Biggest issue is the fluffiness associated with low throttle openings in the 4000-6000 RPM range. Honestly, there are times it feels like it wants to fall on it’s face. Cruising at highway speeds in higher gears is no issue - likely due to higher load when rolling on?

Anywho, no major backfiring and no popping on decal to speak of. Is this a normal trait of the factory fueling or is there something I should be looking into? No check engine light, but maybe it’s a throttle sync? TPS adjustment? Idle speed is consistent on the tach, but it definitely has a very small variation in speed. Maybe a wonky sensor (MAP or O2)?

Appreciate your help in advance. I’m really loving this bike and looking forward to making some upgrades to the suspension and such to really get the most out of this thing!
 
1-3-2-4 said:
First post here as a member, but I’ve been lurking for a bit. Finally bit the bullet and bought my first Hyperstrada 939 a few days ago. I’m an experienced rider with well over 100K miles on the street and thousands more on the track. Also owned a MTS1200 for a few years, so not my first Duc.

With that intro aside, I have some wilding fueling on this engine. There’s about 12k miles on the clock and bike is in mechanically good condition. Completely stock engine. It feels SUPER lean at low loads/throttle openings. Feels nice and crisp at larger loads. Biggest issue is the fluffiness associated with low throttle openings in the 4000-6000 RPM range. Honestly, there are times it feels like it wants to fall on it’s face. Cruising at highway speeds in higher gears is no issue - likely due to higher load when rolling on?

Anywho, no major backfiring and no popping on decal to speak of. Is this a normal trait of the factory fueling or is there something I should be looking into? No check engine light, but maybe it’s a throttle sync? TPS adjustment? Idle speed is consistent on the tach, but it definitely has a very small variation in speed. Maybe a wonky sensor (MAP or O2)?

Appreciate your help in advance. I’m really loving this bike and looking forward to making some upgrades to the suspension and such to really get the most out of this thing!
Click to expand...

Again...not crazy. You may need to spend a little time on this and other forums. The issues you mention are well documented and there appear to be no complete solution. I'll get you started.

Adventures in Hypermotard Tuning...

and here Booster Plug

and here Remapping a Hyper 939

and once you're done, you deserve a little entertainment. Pay special attention to the 4:40 mark.

Cheers Laddie!
 
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Factory fueling on the 939 is terrible, worse than the 821 I had before it. I found it impossible to cruise around town in first or second without a lot of hesitation and surges, getting on the gas would smooth it right out of course. I use the Termi T800 as a plug and play method of flashing the ECU with an appropriate map (they have options based on how the bike it set up). It's not perfect but it is a notable improvement as I can now cruise pretty smoothly.
 
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The fluffiness under 6 K, and the lack of back pressure popping are curious to me. Did you get the service records on this and whether there's ever been a valve check? The surging etc is pretty normal, but fluffy is curious.
 
No valve adjustment. Only 12k miles on the clock. That’ll be a winter task.
 
Just curious, do you put it in URBAN mode in town? Do you use SPORT or TOURING on the highway?
 
Sport mode all the time. The mode only seems to affect throttle, not fuel delivery/quality. It’s a little snatcher on the off-on throttle, but it’s not much of an issue.
 
I find the Urban mode tames things slightly in town but i have to still make allowances when slow cornering that i don't have to do on other bikes. Touring mode seems decent on the highway or secondary roads but still doesn't like slower riding when in traffic. Sport mode just seemed too touchy but i'm not sure if that was in my head. The Boosterplug may have made a slight improvement at lower throttles but has not eliminated the fuelling issues.
 
I find the urban mode to be too tame, but I can see it being good on cold wet roads. I like the crisp nature of sport, but the first few degrees of throttle twist are pretty aggressive.

I’ve been thinking about a booster plug. If it works for me, the price is right. I’m contemplating a reflash to gain additional features, though.
 
I’ve used this on my Multistrada 1200: Ducati_Marelli_7SM | Tuneboy

I’m considering the Upmap, but I haven’t been able to find out much about what I can adjust. There’s a lot of hype about reading the speed and rpm and integrating cameras, which I could care less about.

Aside from a good out of the box map, I’d like the ability to edit, and if possible, reset service minders. My nearest Ducati dealer is over an hour away and they are always booked out for weeks/months.
 
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N4teTheGreat said:
Factory fueling on the 939 is terrible, worse than the 821 I had before it. I found it impossible to cruise around town in first or second without a lot of hesitation and surges, getting on the gas would smooth it right out of course. I use the Termi T800 as a plug and play method of flashing the ECU with an appropriate map (they have options based on how the bike it set up). It's not perfect but it is a notable improvement as I can now cruise pretty smoothly.
Click to expand...

How do I fix my crappy 939 SP fueling? I have the full Term with the factory up-map.... can you rephrase your suggestion?
 
I solved my fueling dilemma. Sold the Ducati and picked up an FJ-09. Despite what some people call unrideable, the Yami makes the Ducati feel like a cave man's ride. It doesn't have that 'snap' that the 939 has, but I'm happy to trade that for a smooth-running responsive engine.
 
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I should probably clear the air lest other newcomers down the road get the wrong idea. While I hated the fueling on my bike, I was ready to pay good money to have it professionally tuned. However, the ergonomics wore on me after a while (Corbin seat...stock much worse!) and I got cold on the bike. I know, I know, I should probably suck it up. But I ride down into teens and I'd wager about 20-30% of my riding happens in the 30-50 range. The lack of wind protection left me very cold, especially my legs and crotch. The lack of a traditional fuel tank really exposed my body in a way that I didn't care for. While I have all the heated gear, I don't like having to wear it to work when the temps in 50F.

Also, despite heavily investing in the suspension, I was never happy with the ride quality. I ended up swapping springs more than once and even revalved the rear shock (Ohlins). Between the chassis and the lack of a linkage, it was never compliant enough for the types of roads we have around here.

The bike was an absolute hoot at more than 8/10's, but I dreaded riding the bike any other way. I did two 450+ mile days on it, and I was sufficiently exhausted afterwards. Meanwhile, the FJ-09...bone stock (for now)...leaves me happy as a clam after the same length days. To each their own, of course!
 
Thanks for your reasoned response. Like you, I find there are plenty of bikes that appeal enough to own (sadly, I dismiss sports bikes out of hand) but are not so easy to bond with in all circumstances. The HS certainly comes into that category for me, being gorgeous to look at and exciting to ride on the right day, but not what I think of as a really friendly companion on the road. Until the next temptation strikes, enjoy your FJ-09!
 
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ferdi said:
seems to be too late, but by installing a Boosterplug you would have solved your problem also ;-)

BoosterPlug - Tuning your Motorcycle Fuel Injection

The BoosterPlug is a real plug and play tuning device for your motorcycle. Free World Wide Shipping and Excellent Customer Service.
www.boosterplug.com www.boosterplug.com
Click to expand...

I've also just fitted a Booster Plug and can say it's made the bike much more tractable in the low RPMs. I was getting tired of having to do roundabouts in 2nd gear with the revs up and feathering the clutch. Now I can chug around in 3rd and it pulls cleanly from 2,500 RPM in every gear.

Whilst I like the idea of getting a proper map editor, I'd have to declare it to my insurer and pay a higher premium. The Booster Plug fixes the low down fueling issue, and it's fast enough for me above 5,000 RPM.
 
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