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Thread: Tuono v4r backfiring.

  1. #1
    apriliaforum Member RocketSauce's Avatar
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    Tuono v4r backfiring.

    Hey Guys/Gals.

    I am hoping that you can point me in the right direction.

    My bike is backfiring at idle. Its pretty subtle, about every 5 seconds there is a pop. Seems to go away after it warms up.
    I also noticed it does it more rapidly when cruising. Does not go away when it warms up.

    The bike is a 2013 with 7k miles. Bone stock. I did disconnect the flapper but that is it.

    Could it be as simple as bad gas?

    Some direction is appreciated.

    Thanks.

    RS

  2. #2
    apriliaforum Junkie Thunder2's Avatar
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    Is it popping back through the intake/throttle bodies? Needs live date scan to see what the MAP's are doing. Injectors/fuel issue, or......valve issue. Compression test, and valve clearance check. If popping out the exhaust, plugs, loading up, exhaust leak, valves.
    2013 Tuono V4R APRC, Sunlit yellow
    2001 Yamaha FZ-1
    1999 TL1000S street fighter

  3. #3
    apriliaforum expert
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    Hmm, you disconnected the exhaust flapper, and I assume you are running the original map. Either download the Race map, or hookup the exhaust flapper and see if the popping goes away.
    Hoosier, not hoser.
    2000.5 Mille R - Ti Shotguns & lots of Evo shtuff
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  4. #4
    apriliaforum expert fr0st's Avatar
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    Quote Originally Posted by Diablo1 View Post
    Hmm, you disconnected the exhaust flapper, and I assume you are running the original map. Either download the Race map, or hookup the exhaust flapper and see if the popping goes away.
    I went 5 year with the exhaust valve dusconnected on stock map without any issues

  5. #5
    apriliaforum expert
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    Quote Originally Posted by fr0st View Post
    I went 5 year with the exhaust valve dusconnected on stock map without any issues
    That’s good info that rules out the flapper valve. I had a laugh when the OP suggested it might be bad gas. I used to work at a bike shop where the owner thought that any Triumph that didn’t run right was due to bent valves or bad gas.
    Hoosier, not hoser.
    2000.5 Mille R - Ti Shotguns & lots of Evo shtuff
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    1983 Yamaha XJ650LK Seca Turbo
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  6. #6
    apriliaforum Member RocketSauce's Avatar
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    Its backfiring out the exhaust from what I can tell.
    How hard is it to change the plugs I might try putting in the new plugs and an air filter as see what that does.

  7. #7
    apriliaforum prov-nov
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    Change the plugs and check all connections whilst you're in there. I have a 2013 that was backfiring and running on 3 cylinders intermittently, I changed the spark plugs and unplugged and replugged every connector whilst in there (even though it was most likely just a dodgy plug). Ran fine after that. Not too hard to change the plugs. Tank up and airbox off then you can access them fairly easy

  8. #8
    apriliaforum Member RocketSauce's Avatar
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    Quote Originally Posted by DavidTV4 View Post
    Change the plugs and check all connections whilst you're in there. I have a 2013 that was backfiring and running on 3 cylinders intermittently, I changed the spark plugs and unplugged and replugged every connector whilst in there (even though it was most likely just a dodgy plug). Ran fine after that. Not too hard to change the plugs. Tank up and airbox off then you can access them fairly easy
    That's good to hear. Which plugs did you use if you don't me asking?

  9. #9
    apriliaforum prov-nov
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    I just used the recommended ones in the service manual. NGK CR9EKB

  10. #10
    apriliaforum Member RocketSauce's Avatar
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    Quote Originally Posted by DavidTV4 View Post
    I just used the recommended ones in the service manual. NGK CR9EKB
    Oh ok. I don't have the service manual. I am assuming they're are 4? They need to have a gap set as well?

  11. #11
    apriliaforum expert
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    Quote Originally Posted by RocketSauce View Post
    Oh ok. I don't have the service manual. I am assuming they're are 4? They need to have a gap set as well?
    4 plugs, gap is already set by NGK. Look for oil on the plug wire boots. If oil is found, you’ll need to replace the plug/cam tower gaskets under the valve cover.
    Hoosier, not hoser.
    2000.5 Mille R - Ti Shotguns & lots of Evo shtuff
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  12. #12
    apriliaforum Member RocketSauce's Avatar
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    Quote Originally Posted by Diablo1 View Post
    4 plugs, gap is already set by NGK. Look for oil on the plug wire boots. If oil is found, you’ll need to replace the plug/cam tower gaskets under the valve cover.
    Thanks for the info. I searched around but ultimately I just ordered them from NGK's website. Hopefully they will be here this week and I can give them a try.

  13. #13
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    Plug torque 12 Nm or 8.85 ft-lb.
    Hoosier, not hoser.
    2000.5 Mille R - Ti Shotguns & lots of Evo shtuff
    2016 Tuono 1100 Factory
    1983 Yamaha XJ650LK Seca Turbo
    2006 Yamaha FJR1300AE

  14. #14
    apriliaforum Member RocketSauce's Avatar
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    Quote Originally Posted by Diablo1 View Post
    Plug torque 12 Nm or 8.85 ft-lb.
    Thanks. DO you know the size of the socket I need by chance.

    Also I am having issues with the tank removal. I am not sure how these fuel lines come off. The one looks like a clamp but I am not sure about the other one.
    Perhaps they're breather lines but either way I am not sure the best way to get the right one off.
    Last edited by RocketSauce; 07-03-2019 at 10:03 AM.

  15. #15
    apriliaforum expert plocky's Avatar
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    Quote Originally Posted by RocketSauce View Post
    Thanks. DO you know the size of the socket I need by chance.

    Also I am having issues with the tank removal. I am not sure how these fuel lines come off. The one looks like a clamp but I am not sure about the other one.
    Perhaps they're breather lines but either way I am not sure the best way to get the right one off.
    The fuel line on the right side has a squeeze release on it, on the end that attaches to the tank rearward & the other bit then pulls out. Make sure you don't force anything here.
    On the other side the 2 small hoses have little spring clamps, they come off easily.
    2015(16) RSV4 RR Ascari Black 201HP

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