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Thread: What modifications are recommended for the 2014 Sr 50 r?

  1. #1
    apriliaforum prov-nov
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    What modifications are recommended for the 2014 Sr 50 r?

    Want to know what modifications are suggested for the Sr 50 r (piaggio engine) to get the most out of it, I've already got 8.3g variator rollers and technigas sports exhaust. Running standard 50cc cylinder.

  2. #2
    apriliaforum Member
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    how quick do you want it and how much are you willing to spend?
    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








  3. #3
    apriliaforum prov-nov
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    Willing to spend a fair amount and wanting to be getting the best out of it, currently top speed of 50mph but sluggish getting there which i think is due to the 8.3gram rollers

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  4. #4
    apriliaforum Member 2Strokesforlife's Avatar
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    Oh man. I can only dream of having the carbed model as it was not offered here in the States due to emissions. The real question is what are your wrenching abilities and how deep are your pockets? There is a sticky on the previous page to show you how to de-restrict your bike but it is for a slightly different engine. This one is pretty straight forward with good pics as well.
    http://www.adrenalin-pedstop.co.uk/T...Tutorial5.aspx
    Get rid of those heavy rollers and go much lighter. I went with 5 grams when I was at 50cc but I have a DiTech which has a completely different power delivery and fuel system. You will see an immediate performance increase along with de-restricting. Do a lot of research and you will find out what parts work well for these machines. And I mean a lot. Search the forum and internet and you will find results for different exhausts, cylinders, and carb setups. Your transmission setup is just as important if not more. If you don't know a lot about CVT transmissions, you will soon, Lol! Everybody has different opinions on what works but most everybody has the same opinions on what to stay away from. I personally wouldn't want to spend too much money by buying new parts because the ones I got don't compliment each other. Most of the time, if it costs more, it's better. At the same time, don't buy the most expensive cylinder and think you can get away with buying a cheap pipe. Or worse, the other way around. There is a fine line between high performance and reliability.
    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

  5. #5
    apriliaforum prov-nov
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    It's already fully derestricted but ill put some lighter rollers in for now and see how it goes, might end up buying a 70cc cylinder kit

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  6. #6
    apriliaforum Member
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    id think rollers might help....maybe even a lighter contra spring...do you live in an area where you have to go up any hills?
    2004 Aprilia Mojito Retro 50cc
    1993 Yamaha Razz
    2001 Triumph TT600

  7. #7
    apriliaforum prov-nov
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    I live in the country side lol there's a few hills here and there

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  8. #8
    apriliaforum expert
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    you need a tto temp gauge and a tach before you touch anything.
    -
    set roller weight at peak hp for acceleration or at peak torque for best top speed. peak torque and peak hp are seperated by only 500rpm so a tach is the only way to tune the rollers.
    ---
    it will cost a 1000 usd dollars to do what you describe. the sr50 has a c shaped reat torque converter wich is just one of the dozen parts you need to gain just 2hp.
    -- i recomend a full touring setup. full touring setup is around 300 usd.
    --- 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.

  9. #9
    apriliaforum prov-nov
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    Where do I buy tto temp gauge and a tach?

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  10. #10
    apriliaforum expert
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    i own the tto gauges because they are modular. made by trail tech. maybe 25usd- 40usd each.

    the tach is a single 6ft wire to install. very easy.

    the temp is a little harder to install and you dont need it unless you get an open filter and new carb and everything.

    ----
    dont change the contrast spring. get new rollers a half gram heavier and a 70cc airsal sport for the best power/accel/topspeed in the stock/touring class.so 85-90km/h real top speed and strong accel up to 75 km/h.
    ----
    check if the carb is 12m or 17.5mm

    ----


    if it is 17.5mm carb then you can get the yazuni Z for best acceleration or the yazuni R for best top speed.

    if the carb is 12mm you need the a touring pipe or just the stock pipe will have some serious accelleration but top speed would be maybe 10km/h higher do to the torque and heavier rollers.
    ----
    done.
    --- 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.

  11. #11
    apriliaforum prov-nov
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    Thanks

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  12. #12
    apriliaforum Member 2Strokesforlife's Avatar
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    You'll never get the acceleration your looking for with heavier rollers. You already have a pipe and you need the lighter rollers to stay in the optimal powerband. Yes, a tach is a good idea if yours is not equipped with one. Yes, keep your contra spring stock. No amount of transmission tuning will give you additional power but it will optimize the engine speed to keep it in the sweet spot. Heavier rollers give good top speed with slow acceleration because the RPM's are below the exhausts power making capabilities. The two Yasuni pipes mentioned are excellent choices for a carb model. There's a reason some exhausts come with 4 gram rollers. Lighter rollers offer good acceleration with about the same top speed. Too light and you will over-rev past the engines powerband. Even though I have a DiTech, the transmissions are the same. 6 gram Dr. Pulley sliders and a stock contra spring at 70cc keep me right at 8,400 RPM's until 53 MPH with a top speed of 60 MPH at 9,000 RPM. 5 Grams at 50cc kept me at 8,500 RPM with a top speed of 58 MPH.

    What is a c shaped rear torque converter?

    http://www.apriliaforum.com/forums/s...n-how-it-works
    Last edited by 2Strokesforlife; 01-20-2017 at 06:14 PM.
    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

  13. #13
    apriliaforum prov-nov
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    What exactly is a tach? And thank you I will keep that in mind

    Sent from my GT-N7100 using Tapatalk

  14. #14
    apriliaforum Member 2Strokesforlife's Avatar
    Join Date
    Aug 2016
    Location
    Jenison, Michigan
    Posts
    209
    Tachometer, shows RPM's, like most cars have
    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

  15. #15
    apriliaforum expert
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    Jul 2015
    Location
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    Posts
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    What is a c shaped rear torque converter?

    http://www.apriliaforum.com/forums/s...n-how-it-works[/QUOTE]

    exactly my point. this is a 300 dollar build with stock carbs. the whole point is it will run better everywhere. the c shaped rear torque converter slots are not straight and have the effect of 3 final gear ratios. it pulls hard up to 25 km/h then has a laggy but good midrange then it drops the rpm again for the final time. each of the 3 steps drops 500 rpm in favour of the top speed and accel. -- the 3rd step is at 75 km/h so light rollers just destroy the top speed. is this sinking in yet because the rear torque converters seem to be over everyones head and it only brings people to an endless need for parts they dont have.
    unless you can prove thr tc is in fact straight i insist your spreading confusion and problems ignored.
    --- 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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