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After the Cannister

RennyRacer

RennyRacer

Joined Oct 2020
76 Posts | 11+
Santa Rosa CA
Ok, canister gone, electrical connector hoses capped, bike runs great until approaching fuel warning light at just 100mi approx. Just dawned on me that previously mentioned pressure, or lack of, makes the motor cantankerous to normal throttle applications. Topped her off a couple miles from home, and can’t definitely say she recovered. Next ride will try filler cap loosened and re-tightened when low fuel light comes on to discern any pressure or vacuum buildup and see how she responds. Btw, does Low Fuel light normally come on at only 100 miles?
 
RennyRacer said:
Ok, canister gone, electrical connector hoses capped, bike runs great until approaching fuel warning light at just 100mi approx. Just dawned on me that previously mentioned pressure, or lack of, makes the motor cantankerous to normal throttle applications. Topped her off a couple miles from home, and can’t definitely say she recovered. Next ride will try filler cap loosened and re-tightened when low fuel light comes on to discern any pressure or vacuum buildup and see how she responds. Btw, does Low Fuel light normally come on at only 100 miles?
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For me low fuel light comes on pretty early, especially driving like a city hooligan. Much better on the hwy. If I fill immediately after the low fuel light comes on, I can get 10 litres in the tank.
 
ericrobinson said:
For me low fuel light comes on pretty early, especially driving like a city hooligan. Much better on the hwy. If I fill immediately after the low fuel light comes on, I can get 10 litres in the tank.
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Agree, the low fuel light on mine comes on at a little over 100 miles.
 
Some very old rants on range. We had some serious hyper-milers that got nearly 200 miles. I milked it just once to see what I could get and got about 175 miles as I pulled up to the pump. Normal driving, 120-130, usually riding on the low light for about 15 miles. I will say if you are constant throttle/ all hwy, 150 isn't that hard. She's very dirty above 75-80 mph, which saps mileage.
 
gatdammit said:
Some very old rants on range. We had some serious hyper-milers that got nearly 200 miles. I milked it just once to see what I could get and got about 175 miles as I pulled up to the pump. Normal driving, 120-130, usually riding on the low light for about 15 miles. I will say if you are constant throttle/ all hwy, 150 isn't that hard. She's very dirty above 75-80 mph, which saps mileage.
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I really thought that the mpg estimates would produce longer intervals. Previously milked the KTM to 200mi. Yes bigger tank but also bigger motor. Loafing 4000 rpm at 70mph however!
 
The fuel light is pretty conservative. I've ridden over 20 miles on it and have never run it dry. You can also burp about a half gallon extra if you give her a little shake, top off, shake, top off...
Stock, it will get a legitimate 50 mpg but you have to drive like you borrowed it from John Wick...after his dog died.
 
gatdammit said:
The fuel light is pretty conservative. I've ridden over 20 miles on it and have never run it dry. You can also burp about a half gallon extra if you give her a little shake, top off, shake, top off...
Stock, it will get a legitimate 50 mpg but you have to drive like you borrowed it from John Wick...after his dog died.
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Good point. I’ve yet to do all day tours in 6th for hours, lol! The around town and backroad riding is getting me around 45+ so not bad.
Btw, have a frustrating side stand issue. With stand up, clutch lever in, 1st gear, starter dead. Gonna post new thread.
 
You guys are getting much better mileage than me. I usually get the fuel light coming on around 80 - 90. Filling up I'm usually putting in around 2.5 gallons. I've had it come on at 60 before but that was a throttle heavy ride.
 
I should also mention I ran the bike dry (ish) once and noticed air being sucked into the tank when I pulled the cap to see. I could hear a little fuel sloshing around. Put the cap back on and it started and ran, but died after a few hundred feet. The dealer thought the vent hose might be pinched but I never got that fixed. I've removed the canister but I still notice it won't run as smoothly when the tank is nearing empty. I didn't see any issues with the vent hose when I had the tank off to do the airbox, and it'll pee a little fuel if I overfill things so I presume the hose and vent work just fine.
 
N4teTheGreat said:
I should also mention I ran the bike dry (ish) once and noticed air being sucked into the tank when I pulled the cap to see. I could hear a little fuel sloshing around. Put the cap back on and it started and ran, but died after a few hundred feet. The dealer thought the vent hose might be pinched but I never got that fixed. I've removed the canister but I still notice it won't run as smoothly when the tank is nearing empty. I didn't see any issues with the vent hose when I had the tank off to do the airbox, and it'll pee a little fuel if I overfill things so I presume the hose and vent work just fine.
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The intricacies of Ducati ownership are indeed entertaining. Unless of course, you own one!
 
It's all that character! If I was a bit more ambitious I take the thing apart and confirm no issues with the intake / velocity stacks / injectors, but, given that it works well enough after the tune and airbox and never misses a beat when the roads get fun, laziness wins.
 
I noticed nobody mentioned which bike they have, and whether it has been modified. On my completely stock 821, I usually get the fuel light on at around 220 km's, and I once ran it dry to over 310. That day I was doing between 180 and 200 km/h for the last 20 minutes of the tank, so could have gone further. I try to always use ethanol-free Shell 91, and I've heard stories that the gas we get up here in Canada is supposed to be a higher quality than in a lot of the places in the US?
 
I usually fill just under 12 liters, about 3 gallons, after running 15 miles on the light. I'm sure I could run almost 30 miles after first light if kept it slow.

Truth is, my hyper just isn't running that great. That, new suspension and a recent spill have taken a little piss out of my hooligan side. I kept throwing a plug in the rear above 100 mph, which was annoying but had me thoroughly test all the tire repair options on the market: Old school slime plugs are good; Plastic plugs are *******; CO2 emergency fill will only get about 16 lbs psi in the tire. I went with a little rubber mushroom plug style kit with compressor. I hate all the weight in my tailbag but I've used almost all of it to get me back on the road recently...anyway

When she was running good and my confidence was high, I usually got the light in the 90's.
 
My 939 is lightly modified. Termi low mount slip on, 2 up on the rear sprocket (which makes it match a stock 821 gearing) Star.Ace airbox lid with a Sprinter filer and the Termi UpMap T800 with a map designed for said airbox lid and a stock pipe (slip on has a cat in it so it farts about the same as stock). Light comes on around 80 - 90 miles but most of my riding is either spirited 1st 2nd and 3rd gear twisty Northern Cali roads or slabbing to get to said roads at speeds between 85 - 95 mph. And I'm kinda heavy, and not particularly aerodynamic. Probably why I haven't had a rear tire yet that lasted for more than 5k. Current Road 5 might break that record as it's at 4k now and seems like I'll be able to milk another 2 - 3k out of it.
 

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