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Thread: Aprilia rally 50 ac 97 help!

  1. #1
    apriliaforum newb
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    Aprilia rally 50 ac 97 help!

    Hi! I got a aprilia rally 50cc that was sitting for some years and I kinda did a rebuild on it (im noob in mechanics but I like to learn ^^)..

    New piston and rings, new sparkplug, new air filter, cleaned carburetor, cylinder etc

    Problems:
    fuel gage not working propely, it shows that low fuel when actualy it has full tank
    turning signals blink to quickly (I replaced the bulbs already)

    can this happen because I dont have a batery on it?

    Questions:
    Im riding it for some days now and it goes 70km/h is this a good speed? sugestions to get more top speed ?
    Are there a "optimal" carb settings? Im 1 1/2 turn out for the air screw is that ok?

    Many thanks!!

  2. #2
    apriliaforum Member chrissrx6's Avatar
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    1/fuel gauge not working properly, it shows that low fuel when actually it has full tank
    turning signals blink to quickly (I replaced the bulbs already)
    can this happen because I don't have a battery on it?

    Yes,this circuit need 12volts to work correctly.

    2/Im riding it for some days now and it goes 70km/h is this a good speed?

    44MPH is good for a 50cc scooter

    3/Are there a "optimal" carb settings?
    Yes. needs to set so that the engine is not running lean, which will cause damage to the engine.
    You can check this using colour tune or the plug guide in the Haynes manual.
    There are other methods but I have not used them.

  3. #3
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    I thinked that I wouldnt need a battery in order that to work properly but I was wrong then..

    I took a pic of my sparkplug and it looks like this.. Am iI running rich? (too much gas in the air/fuel ratio? If yes, what can I do to fix it?
    My bike has oil pump, so I dont think its to much oil in the mixture.. And my bike got some black spooge on the end of the exausht when I ride it in "long" trips..
    Click image for larger version. 

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    Thanks again, much apreciated..

  4. #4
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    any help?

  5. #5
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    Hi, I've installed a 12v 4amp battery and now the lights work normally but the fuel counter dosent read very good.. I have fuel tank and it says I have like a litle more than half..
    Second problem is with the starter the bike dosent start at first, i must try 3 times so it to start...

    Question: If I change my rollers will I get more top speed? I need lighter or heavier?
    I checked my reeds and they seem fine, but someone told me I must change them reguraly, is it true?

    Thanks!

  6. #6
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    its running cold. the oil and carbon is not burning. drop the main jet back to stock size or explain your setup better.

    you need a tach to tune the rollers- peak torque and peak hp are seperated by only 500 rpm.
    --- diploma for engine repair in 2012 ---

    derbi bullet 2006 - piaggio AC - malossi T.C. half - custom GPS dash - TPR 70CC - topperf crank - vl13 reed and spacer- yamaha rt180 kickstand - giannelli shotV4 - phbg 21mm - doppler mesh top venturi filter

    complete wtp volta bmx 2012 - sanko seamless japanese cromoly heat treated and blue printed frame - 21lbs

    1992 lt250r suzuki quadracer - maier plastics -chromed shearer pipe - chromed works suspension - ++++++++ - 220lbs

    previous vehicles - subaru legacy turbo 1991 - mazda mx6 turbo 1990.

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