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

  1. #1
    just another Aprilia fanatic amauri's Avatar
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    testing a cheap and easy fix for hot start issue

    Many RSV4's and TV4's are experiencing difficulty starting when the engine is hot, the starter cranks but struggles to turn the engine over fast enough, as if the battery is dead.
    This usually happens when you stop for gas or a short break and try re-starting within a few minutes. Never a problem when the engine is cold.

    First, make sure the battery is good (holds a charge and passes a load test)
    Test your charging system to make sure you have correct charging voltage at the battery, usually 13.5 - 14.2 Volts with the engine running.
    Test the stator (especially 2012+ bikes) and make sure it passes continuity and short to ground tests with engine at full temp.
    If the battery and/or stator are weak, this modification will not help at all.


    I know that many are having good results with the motoelectrics heavy duty battery cables kit, but it is expensive and can be difficult to install correctly for the average person.

    I've been testing a simpler fix on two customer's bikes for a couple weeks now and it seems to be working.

    The starter solenoid does double duty as both the main +12V power distribution point to the whole motorcycle, and it also sends high current or Amps to the starter when you push the start button.

    Take a look at the OEM positive wire from the battery to the starter solenoid, it is a 8-gauge wire.
    Now take a look at the wire from the solenoid going forward to the starter motor, it is also a 8-gauge wire.

    My solution is to install a second wire to supplement the solenoid from the battery.
    Not removing the original wires and replacing with all new wires, just a second wire in parallel with the original.

    The wire I added reduces the voltage drop to the starter and to the ECU, fuel pump, injectors and ignition while cranking the engine.

    Please see photos showing the 15" long 12-gauge wire with crimp terminals on each end and installation routing.

    Of course, the usual precautions must be followed.
    disconnect the battery before you do anything and make sure you route the wire properly so there is no danger of it shorting to metal and possibly starting an electrical fire or worse.

    Like I said, this is not a guarantied fix, but worth a try for those experiencing the issue.
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    Last edited by amauri; 05-16-2017 at 06:16 PM.
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  2. #2
    apriliaforum prov-nov Prospek's Avatar
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    Thanks Amauri!!! No issues so far but will keep this in mind.

  3. #3
    apriliaforum Junkie
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    Will keep this in mind as well! thanks Amauri

    edit: did you make the wire yourself or is this something readily found in stores?

  4. #4
    apriliaforum Member mastro1's Avatar
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    Amauri,
    That's a great idea...makes sense. Just did it, hope it works. Easy fix!

  5. #5
    just another Aprilia fanatic amauri's Avatar
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    Quote Originally Posted by mastro1 View Post
    Just did it, hope it works. Easy fix!
    Please post your results after a few weeks of ridding the bike with this modification.
    We may have to wait until the weather is very hot again before we know for sure if this will help or not.
    Never accept mediocrity, always demand competence.

    Certified Aprilia Moto Service in Southern California
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  6. #6
    apriliaforum Member mastro1's Avatar
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    Quote Originally Posted by amauri View Post
    Please post your results after a few weeks of ridding the bike with this modification.
    We may have to wait until the weather is very hot again before we know for sure if this will help or not.
    No problem will do!

  7. #7
    apriliaforum newb
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    did you make your own cables?

  8. #8
    just another Aprilia fanatic amauri's Avatar
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    Quote Originally Posted by PJV View Post
    did you make your own cables?
    What cables?

    It's one simple piece of wire and two crimp terminals.
    Never accept mediocrity, always demand competence.

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  9. #9
    apriliaforum Member
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    It's coming into summer in here Australia (not uncommon to see 40+C temps where i am), so I'm sure I'll be able to run some tests. I've been caught out with this before. Thanks for suggestion Amauri.
    If the facts don't fit the theory, change the facts. - Albert Einstein

  10. #10
    apriliaforum Member fostytou's Avatar
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    I ran into this a bunch of times this summer, but only when it was very hot out and I had been riding hard all day. I'll try to give this mod a shot this winter but it'll be a while until I can test in those conditions.

    Thanks for the tip as always.

  11. #11
    just another Aprilia fanatic amauri's Avatar
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    This thread is about testing a possible solution that is both easy and inexpensive.
    Any postings not specifically related to testing this single wire addition will be deleted.

    If you have a better idea on how to fix this annoying problem, please start another thread.
    Never accept mediocrity, always demand competence.

    Certified Aprilia Moto Service in Southern California
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  12. #12
    apriliaforum newb
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    amauri, do you crimp your own cables? Was looking for a tool to buy on amazon

  13. #13
    just another Aprilia fanatic amauri's Avatar
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    It is a std wire stripper/crimping tool you can buy at any auto parts store, same with the terminals and 12g wire
    Never accept mediocrity, always demand competence.

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

  14. #14
    apriliaforum newb
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    thanks

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    apriliaforum expert Gabro's Avatar
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    Amauri, you can add a check to first post "be sure you have lastest map loaded in the ecu"
    i had 2 '09 bikes with hot start issues, fixed simple loading a 13A9 map. Older map had a very narrow window to sync pulsation so ecu sometime was unable to phase at startup
    ECU tuning and reflashes since 2004!
    www.gabroracingteam.it


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