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Thread: HELP what 70ccm cylinder kit do i buy?

  1. #1
    apriliaforum prov-nov
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    HELP what 70ccm cylinder kit do i buy?

    Hi, i have a 2014 aprilia sr 50 r, i want to buy a 70 kit to make it quicker but just cant decide which one! i need one that will have huge acceleration increase which i can use daily and isn't too expensive.Could you guys suggest any?

  2. #2
    apriliaforum expert
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    the airsal sport 70cc is the only one that is tuned for the stock 8000rpm/ and the motoforce sport 70cc.


    but the rest of the sport 70cc are timed for 8600rpm so you will not be able to take full advantage of the port timing and air fuel ratio.
    Last edited by sublunacy; 01-18-2017 at 03:12 PM.
    --- 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.

  3. #3
    apriliaforum prov-nov
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    so would a stage 6 mkII racing 70 kit not work as well?

  4. #4
    apriliaforum expert
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    s6 racing is a 12-14000rpm cylinder. there is nothing that will do it. high speed requires torque to maintain the speed/ if you need the high rpms to do it they dont last long and are to loud and fuel inefficient.

    ---
    stock has 6-7 ft/lbs. the airsal sport is 8ft/lbs. rpm is the same for both so you dont need to change anything else.

    ---
    wich carb do you have? the keihin 12mm or the dellorto 17.5?
    --- 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.

  5. #5
    apriliaforum Member
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    Are you planning on just getting a 70cc kit and nothing else? Do you already have a different exhaust on the bike or just the standard one? If you do have a standard exhaust you should definately get a new one, something like a yasuni R. For the 70 kit go for a stage 6 sport pro mk2. You'll also need some jets for it, they are 6mm dellorto and get a range from around 65-85. You will also need some new rollers, i'd recommend around 5g and get some harder clutch springs. Polini does a box of 4 different strengths and if you wanted to get a racing mk2 you will need to spend a hell of a lot on a new crank, carb, variator, clutch and a few other things. Also just a quick question, how many miles does your bike have on it? If you have too many on the standard crank going for a 70 is not a good idea.
    Black Sr50r 2014

    Current mods


    Stage 6 RT 70
    Stage 6 RT crank
    Flowed engine case
    Stage 6 R 1400 with RT end can
    Stage 6 water pump
    Doppler inner rotor ignition
    Stage 6 R/T shock absorber
    stage 6 v force 3 reed block
    Stage 6 black f1 mirrors
    Stage 6 112mm clutch with Malossi MHR black springs (Much better than the stage 6 springs )
    Stage 6 oversize variator 5.0g rollers
    Stage 6 oversize rear pulley
    Stage 6 oversize belt
    Stage 6 medium torque spring
    Ngk b-e 10.5 spark plug
    BGM boost bottle
    Stage 6 metal inlet manifold
    Stage 6 28mm RT flatside PWK- 122 main jet second clip down
    No airfilter (won't run with one )
    stage 6 1:2.53 gear up kit
    Top speed- fast......

    Next mods

    Mvt Premium inner rotor ignition








  6. #6
    apriliaforum Junkie 2Strokesforlife's Avatar
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    Quote Originally Posted by TheSnipez View Post
    Are you planning on just getting a 70cc kit and nothing else? Do you already have a different exhaust on the bike or just the standard one? If you do have a standard exhaust you should definately get a new one, something like a yasuni R. For the 70 kit go for a stage 6 sport pro mk2. You'll also need some jets for it, they are 6mm dellorto and get a range from around 65-85. You will also need some new rollers, i'd recommend around 5g and get some harder clutch springs. Polini does a box of 4 different strengths and if you wanted to get a racing mk2 you will need to spend a hell of a lot on a new crank, carb, variator, clutch and a few other things. Also just a quick question, how many miles does your bike have on it? If you have too many on the standard crank going for a 70 is not a good idea.
    2009 SR 50 Factory
    Malossi 70cc BBK
    Malossi HPC Crankshaft
    Stage6 Waterpump Impeller
    Arrow Extreme Pipe
    Malossi VL 13
    Ecu De-restricted 2.8.0
    7 Gram Dr. Pulley Sliders
    Stage6 Soft Contra Spring
    Water Trap
    RS 24/10
    Stage6 260mm Front Brake
    Stage6 Torque Control MKII 107mm
    Stage6 R/T Clutch Bell 460g
    Malossi Special Belt
    Malossi E5 Air Filter
    Stock Gears Installed

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