Author Topic: Slight misfire on a West Coast ride  (Read 690 times)

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Offline Troutman

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Slight misfire on a West Coast ride
« on: July 21, 2021, 08:33:25 »
Took the DL1000 to Skye on Monday via Clan Coe , Fort William, Glengarry etc...fantastic ride in perfect weather , the roads up there are superb and the scenery is world class , got back last night, 550 miles in 2 days...amazing
Bike was flawless but I did get the odd misfire and cough out the intake occasionally , it did a big one when I hit the throttle to overtake at one point and I had to back out.
Any ideas what this might be? It also bogs a tiny bit when sitting at constant speed (say 50mph) but just twist throttle and it's fine.
TPS going bad maybe?
Black Widow pipes are perfect for me and I need to sort the leaking left fork seal next.

Offline hill100

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Re: Slight misfire on a West Coast ride
« Reply #1 on: July 21, 2021, 11:34:34 »
plugs and valve check ??

Offline Downunder

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Re: Slight misfire on a West Coast ride
« Reply #2 on: July 21, 2021, 12:12:52 »
My DL1000A was behaving similarly a while ago towards the end of a 1,000km three day trip. The misfiring and poor running became progressively worse on the last day. Not too far from home, it got to the stage where I would be riding along at a constant 80 kph and the engine would die. After coming to a stop I could restart it and ride a few kilometres before it would stop again. The problem turned out to be that the fuel filter inside the fuel pump was blocked. The bike had done 56,000 kms. Once I replaced the filter the bike ran normally once again.
Richmond, NSW, Aus
DL1000 ABS 2014

Offline kwackboy

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Re: Slight misfire on a West Coast ride
« Reply #3 on: July 21, 2021, 12:30:19 »
The older Vees are known to have the odd cough now and again and popping the injector bodies out of the rear inlet.

Other fueling issues can be down to the fuel pump sieve starting to block or the pump motor giving out a lower flow rate, it should be around 1.2 litres over 30secs .
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Offline Mr Nick

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Re: Slight misfire on a West Coast ride
« Reply #4 on: July 21, 2021, 12:36:03 »
It's a bit odd that checking the fuel filter appears nowhere on service schedules: you change the fuel hoses every 4 years (yeah, like that happens) but never the filter.
Seems pearl asbo orange is faster after all....

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Offline kwackboy

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Re: Slight misfire on a West Coast ride
« Reply #5 on: July 21, 2021, 12:42:42 »
I guess it comes down to safety as brake line internals over time (a lot longer than specified) can break down causing failure.
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Offline Mr Nick

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Re: Slight misfire on a West Coast ride
« Reply #6 on: July 21, 2021, 13:20:54 »
I get the safety items: brake hoses and fuel hoses do deteriorate, and the internal pressure in each makes failures seriously unwanted, but they have fixed intervals for replacing the other filters, so why not the fuel? It's not just Suzuki either - the manual for my 990 doesn't mention it either, yet mine became clogged causing hesitation & coughing that could have been catastrophic at the wrong instance. No interval for changing fuel hoses on it though, just the o-rings on the dry break connections. And no brake hose times as they're already braided: just checks.
Seems pearl asbo orange is faster after all....

'Don't believe all the quotes in forum signatures' - Aristotle

'Ehh, good enough' - Mediocretes

Orange Bikes Matter!

Online Rusty Nuts

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Re: Slight misfire on a West Coast ride
« Reply #7 on: July 21, 2021, 13:42:08 »
Yes, when you think about it. Oil filters and air filters have a change schedule, why not fuel?

Offline kwackboy

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Re: Slight misfire on a West Coast ride
« Reply #8 on: July 21, 2021, 13:48:42 »
Definitely a valid point Mr nick ..  :thumb:

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Offline Mr Nick

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Re: Slight misfire on a West Coast ride
« Reply #9 on: July 21, 2021, 14:17:23 »
The boredom of still working from home makes you explore such existential questions...
Seems pearl asbo orange is faster after all....

'Don't believe all the quotes in forum signatures' - Aristotle

'Ehh, good enough' - Mediocretes

Orange Bikes Matter!

Offline Troutman

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Re: Slight misfire on a West Coast ride
« Reply #10 on: July 21, 2021, 16:18:46 »
Yeah it wasn't too bad just makes you a wee bit nervy when you're 200 miles from home.
I don't think it was a fuel supply issue as the last stretch down the M8 was at 85mph for 45mins with no issue at all. I think it's the nature of the beast.
What a bike though, never felt so at home on a bike before, I have a sheepskin seat cover which was brilliant in the heat, keeps your botty cool funny enough.
Is the fuel filter in the tank? Easy job? Doubt it..

Offline Rixington43

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Re: Slight misfire on a West Coast ride
« Reply #11 on: July 21, 2021, 16:31:49 »
Mine does occassionally cough and miss when blipping for downshifts from lower revs but never under load.
New plugs and a re-sync on the throttle bodies has improved mine a great deal although I do know it had been running crazy rich due to an exhaust leak so my plugs were completely shot.
Checking them and replacing them is nowhere near the nightmare I'd been lead to believe by some other forums though, didn't even need the fancy Suzuki spanner for the front plug.

Offline Troutman

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Re: Slight misfire on a West Coast ride
« Reply #12 on: July 21, 2021, 18:35:38 »
That's when mine does it, blipping for rev matching on down shifts
The bogging down it does is barely noticeable but I notice it and it's short lived (no more than 2 sec)
I'd like to change the plugs as I think they're the original ones from new. 

Offline TLPower

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Re: Slight misfire on a West Coast ride
« Reply #13 on: July 21, 2021, 19:10:29 »
Reference fuel filter changes, I changed mine at 18k. I'll do them again at 36k.

My bike didn't have any symptoms, I just figured it was preventative maintenance. :)
To be happy, I don't need private helicopters,a Florida house or a yacht. I'm fine with my motorcycle,a trip to a forest in Bavaria and some lunch money.

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Offline Rixington43

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Re: Slight misfire on a West Coast ride
« Reply #14 on: July 21, 2021, 19:18:04 »
I think it's probably just a by product of a slightly low-fi injection system by modern standards. Mine has done it ever since I've owned it but it's pretty rare and it's never actually cut out on me despite the resultantly embarrassing amateur grade down shift 😬.
It has done it far less with new iridium plugs and synced throttles though thankfully.

Offline Downunder

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Re: Slight misfire on a West Coast ride
« Reply #15 on: July 21, 2021, 23:27:50 »
Is the fuel filter in the tank? Easy job? Doubt it..
It is in the tank and is a part of the fuel pump. I changed mine myself and didn%u2019t find it hard. It does take some time. I just bought the new filter before starting the job.
Photos are of the old and new filter and the old filter cut open.

Richmond, NSW, Aus
DL1000 ABS 2014