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Thread: Backfire through air box

  1. #1
    apriliaforum prov-nov TheBuilder's Avatar
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    Backfire through air box

    So as the title says I've been getting the odd backfire through the carbs and air box. It seems to be mostly after decelerating and coming to a stop or all most stop. Has any one else had backfiring into the air box?
    It's not peer pressure....it's just your turn.


    2011 Dorsoduro 1200 LeoVince Carbon
    Pazzo shortys
    2010 Rossi R1 (traded)
    2006 GSXR 750 (sold)
    2000 GSXR 600 (sold)

  2. #2
    apriliaforum Member Mike06's Avatar
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    Hi, I also have backfiring into the airbox.

    My bike has 2500kms now and the backfiring was there since it was brand new.
    It happens when I slightly accelerate from the iddle and the bike almost stalls.
    I took down the tank and airbox yesterday to check something and I found a little gas in the airbox around the entrance of the back cylinder admission pipe.
    The backfirings also broke in pieces the two brackets around the frame where we have to screw the bolts through the front of the tank...
    I think the valve clearance is bad but maybe it's another issue ?

    Did it happens to someone else ?

    PS : sorry for my bad english, I'm french and I try to remind me my school years but they are far away in my memory...
    2016 Aprilia Tuono V4 1100 RR Portimao grey

  3. #3
    apriliaforum newb
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    I also have thisn problem. also my bike is starting to surge when I try to maintain a constant speed. I just hit 17,000 miles and have the original spark plugs. can any help me solve this problem

  4. #4
    apriliaforum Member
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    I think mine is doing this too, but I wouldn't classify it as a backfire, more of a misfire. Usually happens at a stop when the bike is idling...go to roll on the throttle and the bike gasps, more of a vocal cough through the exhaust. Bike will die if the clutch gets let out. Have to grab a hand full of clutch and let off the throttle or it dies. It's a hard thing to describe, almost as if the engine chokes under the weight of it's compression; like one cylinder isn't firing at the right time. Maybe it's too rich and igniting fuel on the exhaust cycle. Or maybe it's just fine italian character.

    Do any of you run the fat duc? I thought that maybe that was the case and backed mine off. hasn't really helped much.

  5. #5
    apriliaforum Member
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    Not running fatduc and experiencing same issue. Just had demand sensor replaced and still issue with misfire and engine braking, especially in 4th gear above 3000rpm, very snappy and abrupt engine braking.. Very frustrating dealer can't diagnose issue and Italy said faulty demand sensor yet issue still there, bike is going back in again next week

  6. #6
    apriliaforum prov-nov TheBuilder's Avatar
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    Backfire through air box

    Ya I have the fatduc in mine. Mine seems to do it more often if I'm putting around town and also if the weather is hot and humid. I'm leaning toward unburnt fuel igniting at the wrong time either due to plugs with the wrong heat range or plugs carbon'd up enough that it stays hot enough to burn the left over fuel. Really not sure what it's doing :S
    It's not peer pressure....it's just your turn.


    2011 Dorsoduro 1200 LeoVince Carbon
    Pazzo shortys
    2010 Rossi R1 (traded)
    2006 GSXR 750 (sold)
    2000 GSXR 600 (sold)

  7. #7
    apriliaforum Member
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    What engine mode do you guys run in? I initially thought it could have something to do with "S" mode. Appears that mode has stronger engine braking and I remember hearing someplace that it changes the ignition/timing, but could be wrong. That could be an cause of a harsher ignition scheme.

  8. #8
    apriliaforum Member Mike06's Avatar
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    I read on the italian DD forum that many owners have this problem with the new map.
    They advised the Aprilia factory in Noale and await their response.

    Here's the link for those who understand Italian :
    http://lnx.dorsoduroforum.com/forum/...p?f=36&t=11701
    2016 Aprilia Tuono V4 1100 RR Portimao grey

  9. #9
    apriliaforum prov-nov
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    Any more news about this issue ?

  10. #10
    apriliaforum prov-nov TheBuilder's Avatar
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    Backfire through air box

    I'm assuming not but does anyone know if you can go back to different map updates?
    It's not peer pressure....it's just your turn.


    2011 Dorsoduro 1200 LeoVince Carbon
    Pazzo shortys
    2010 Rossi R1 (traded)
    2006 GSXR 750 (sold)
    2000 GSXR 600 (sold)

  11. #11
    apriliaforum prov-nov
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    https://www.youtube.com/watch?v=I6OwaYIok5U
    look at 1:45 and 2:04
    are we talking about same issue here ?

  12. #12
    apriliaforum Member Mike06's Avatar
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    Exactly the same issue for me !
    2016 Aprilia Tuono V4 1100 RR Portimao grey

  13. #13
    apriliaforum prov-nov
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    I have additionally issue. Sometimes while riding after closing throttle (engine breaking) when i open throttle again a bit (just a little) my dorso can't decide - accelerate or not ..it accelerate, then slow down for a second then accelerate again.
    Is it related ? to backfire, choke ?

  14. #14
    apriliaforum prov-nov TheBuilder's Avatar
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    Backfire through air box

    @Luzik

    Ya Id say that pretty much what I have too. I've had them bad enough that it stalls the bike.
    It's not peer pressure....it's just your turn.


    2011 Dorsoduro 1200 LeoVince Carbon
    Pazzo shortys
    2010 Rossi R1 (traded)
    2006 GSXR 750 (sold)
    2000 GSXR 600 (sold)

  15. #15
    apriliaforum prov-nov
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    today i connected guzidiag http://www.apriliaforum.com/forums/s...idiag-for-RSV4 and find out that air pressure in rear cilinder differs from front one ..even on idle !

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