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Thread: testing a cheap and easy fix for hot start issue

  1. #16
    just another Aprilia fanatic amauri's Avatar
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    Gabro, I do remember those starting problems with the early bikes.
    At first Aprilia released a bulletin with the different crank timing sensor that didn't help.

    But that starting problem was not the same as many are experiencing on the newer bikes with the newest maps (like the two bikes I'm testing).

    That old hot starting problem was a case where the starter would engage and spin at normal speed, but the engine would not fire and run.
    Installing this wire will not fix that one.

    This hot start problem is very different because the starter is acting very lazy and doesn't want to spin the engine at normal speed, sometimes not at all until you give it time to cool off.


    I suppose that the first step is to first identify which starting problem we are dealing with.
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  2. #17
    apriliaforum prov-nov X_Splinter's Avatar
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    Quote Originally Posted by amauri View Post
    Gabro, I do remember those starting problems with the early bikes.
    At first Aprilia released a bulletin with the different crank timing sensor that didn't help.

    But that starting problem was not the same as many are experiencing on the newer bikes with the newest maps (like the two bikes I'm testing).

    That old hot starting problem was a case where the starter would engage and spin at normal speed, but the engine would not fire and run.
    Installing this wire will not fix that one.

    This hot start problem is very different because the starter is acting very lazy and doesn't want to spin the engine at normal speed, sometimes not at all until you give it time to cool off.


    I suppose that the first step is to first identify which starting problem we are dealing with.
    Any idea if this will fix earlier models problem?

  3. #18
    just another Aprilia fanatic amauri's Avatar
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    what is the difference between the earlier model problem and the newer problem?
    Never accept mediocrity, always demand competence.

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  4. #19
    apriliaforum newb Johnboy71's Avatar
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    Nice work around! I've been working on this issue in the UK, and although I make a full cable kit for the V4, which is a more elegant way of solving the issue, you've nailed the problem by improving the current carrying capacity of the starting circuit.
    the V4 only has a 10mm2 cable to start with ( excuse the pun) so is on its absolute limit of being able to draw enough current to the starter motor. So when the engine is hot, they do tend to nip up a little ( just like the Vtwins) so your starter physically can't draw enough current through the standard wet string that Aprilia install at the factory.

  5. #20
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    Amauri, do you remember what size for the two crimp ring terminals?
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  6. #21
    just another Aprilia fanatic amauri's Avatar
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    The bolt on the battery terminal is 6mm diameter on the older bikes or 5mm on the newer bikes.
    The bolt on the solenoid terminal is 5mm.
    Never accept mediocrity, always demand competence.

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  7. #22
    apriliaforum expert
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    Quote Originally Posted by amauri View Post
    The bolt on the battery terminal is 6mm diameter on the older bikes or 5mm on the newer bikes.
    The bolt on the solenoid terminal is 5mm.
    Thanks.....
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  8. #23
    apriliaforum Member cb77guy's Avatar
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    I am having the problem with my 2016 and am wondering if I used a piece of 8 gage wire instead of 12 gage wire for the supplemental wire would cause any problem. I just happen to have some left over from a home wiring project.
    2016 Aprilia RSV4 RF LE #11 of 200
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  9. #24
    apriliaforum Junkie
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    you simply add the wire right? you're not removing the old stock 8g wire right?

  10. #25
    apriliaforum Member the kapitein's Avatar
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    I did do the update today. Just like you wrote in your first post.
    If the winter is leaving The Netherlands I hope to do some tests. Do you think it needs an extra cable to the starter motor?

    Marco.

  11. #26
    apriliaforum expert
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    Quote Originally Posted by Tekniqs View Post
    you simply add the wire right? you're not removing the old stock 8g wire right?
    Yes, you're adding a piece of 12 gauge wire in parallel with the original 8 gauge wire.
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  12. #27
    just another Aprilia fanatic amauri's Avatar
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    Quote Originally Posted by the kapitein View Post
    I did do the update today. Just like you wrote in your first post.
    If the winter is leaving The Netherlands I hope to do some tests. Do you think it needs an extra cable to the starter motor?
    So far, with the two bikes I'm testing, the single 12g wire to the solenoid has fixed the issue.

    I don't think there is a need for another wire between the solenoid and starter.
    If you can, please test and see how the single wire addition you've installed works out for your bike.
    Never accept mediocrity, always demand competence.

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  13. #28
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    Quote Originally Posted by amauri View Post
    So far, with the two bikes I'm testing, the single 12g wire to the solenoid has fixed the issue.

    I don't think there is a need for another wire between the solenoid and starter.
    If you can, please test and see how the single wire addition you've installed works out for your bike.
    awesome!

  14. #29
    apriliaforum Member dmc1's Avatar
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    Quote Originally Posted by amauri View Post
    So far, with the two bikes I'm testing, the single 12g wire to the solenoid has fixed the issue.

    I don't think there is a need for another wire between the solenoid and starter.
    If you can, please test and see how the single wire addition you've installed works out for your bike.
    I will second this statement. I just finished the mod and it seems to have plenty of current running to the starter now.
    I was able to start it even with gearing engaged. The secondary wire amauri suggests is plenty for helping alleviate the burden of running the accessories while cranking the engine.

    Thanks and kudos, amauri!

  15. #30
    just another Aprilia fanatic amauri's Avatar
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    Thanks for the feedback, hopefully others will report back with their experiences.

    And thanks for doing a better job explaining the idea behind this second wire:

    "The secondary wire amauri suggests is plenty for helping alleviate the burden of running the accessories while cranking the engine."

    That was my reasoning for trying this.
    Never accept mediocrity, always demand competence.

    Certified Aprilia Moto Service in Southern California
    Call me at 714 892-4056 for appointment

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