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Thread: Aprilia 70cc conversion troubles help needed.

  1. #1
    apriliaforum newb
    Join Date
    Apr 2018
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    United kingdom
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    Aprilia 70cc conversion troubles help needed.

    Hi i desperatley need help this little scooter is driving me insane, it has just had a 70cc big bore kit fitted by myself with the recomended 21mm black series carb (delorto) so i have been adjusting the heights of the needle and got no where, new plugs hot and standard types no difference at all, new arrow exhaust no difference at all now starting to wonder if there is a dark art to tuning these little engines. I am a master mechanic and i tell you this little shit of a scooter has caused me to swear more than once i tell you. I have done every bit of tuning i can imagine and nope it just sits down and says no i am not playing so over to you Aprilia guys for some help and advice or i will set fire to the little bstard.

  2. #2
    apriliaforum expert
    Join Date
    Jul 2015
    Location
    ontario
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    1,014
    Needs good reeds that don’t leak.

    otherwise the carb is very big for a sport bbk and the arrow so expect it to work well to half throttle then tuning while get very vague after that.

    start at the bottom

    idle jet tune
    low speed jet tune
    needle does the pipe hit and midrange
    main jet for peak power
    done
    --- diploma for engine repair in 2012
    --- custom parts and machining
    -2T&4T cylinder&engine prep,port,polish,balancing--------------------------

    -derbi bullet 2006 - piaggio AC

    https://www.apriliaforum.com/forums/...t-Tuning-Guide << Link

  3. #3
    apriliaforum expert
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    Jul 2015
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    ontario
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    1,014
    If you get really frustrated then let me know. The carb comes tuned for regular afr for most engines. If you want easy then a tillotson kart carb is the best way to find a good tune. Expensive and difficult to install on a scoot thou
    --- diploma for engine repair in 2012
    --- custom parts and machining
    -2T&4T cylinder&engine prep,port,polish,balancing--------------------------

    -derbi bullet 2006 - piaggio AC

    https://www.apriliaforum.com/forums/...t-Tuning-Guide << Link

  4. #4
    apriliaforum expert
    Join Date
    Jun 2013
    Location
    croatia
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    2,430
    get a dellorto 17.5 carb the 21 is just to big for the setup

  5. #5
    apriliaforum prov-nov
    Join Date
    Mar 2019
    Location
    Hungary
    Posts
    86
    I was running sport with dellorto 21 mm ds + pod filter before.Too big?Nah, just hungry.

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