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Thread: To keep, to sell or upgrade to 70cc

  1. #1
    apriliaforum Junkie
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    To keep, to sell or upgrade to 70cc

    I've been thinking of buying somethin new. A new scooter replacing the SR50R. 8 years is a long ride and usually I've gotten boored way more often.

    With this current setup (well setup... only variator ring removed) it would be same to change into a stock 50cc 4t scooter.

    But what If I would upgrade it into a 70cc? I think it would be like riding a new machine again. Something sporty, not racy.

    If I decide to go this way. What would be a good cylinder?

    -I do NOT want to get rid off oil pump. Premixing sucks.
    -stock carb
    -I allready own a LeoVince ZXR pipe so it would be nice if I could use that. (alltho I hat te damn thing. IT IS TOO LOUD for me)
    -accelartaion is plus, max. speed is not that important. Reliability is the best.

    Done abou 11000km so Im guessing the bottom end is still in its strenght and can handle a bigger cylinder without changing the crank and bearings.

    So only what I need is a cylinder and variator/clutch kit. Any recommendations? And what kind of power should I expect getting with this mild setup? I'd like to see over 10hp from the engine.
    Aprilia SR 50 R Factory 2009 Silver Crowd
    Aprilia SR 50 2008 Silver Crowd
    Aprilia RS 50 2003 SBK Replica

  2. #2
    apriliaforum expert
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    go full mhr or sell it. or full topperf tpr maybe.
    --- 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 Junkie
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    Quote Originally Posted by sublunacy View Post
    go full mhr or sell it. or full topperf tpr maybe.
    Naah.

    BTW isnt there a video anywhere in the interweb that deals with removing the engine out of the SR50R frame? A video of any Piaggio NRG would work too, guessing its quite similar.

    All I found was this faq with pics from this forum, but is.. well better suited for the old ditech.
    Aprilia SR 50 R Factory 2009 Silver Crowd
    Aprilia SR 50 2008 Silver Crowd
    Aprilia RS 50 2003 SBK Replica

  4. #4
    apriliaforum expert
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    check out a derbi senda 125.

    you all ready answered your own question if its too loud.
    however/ this is my thoughts on a quiet 70cc with 8-10hp at 8600rpm- fly clutch - multivar 16mm - trophy 70cc - yasuni r - 19mm del - doppler airfilter - rear torque driver.

    --------
    or a cheaper setup with only 8hp at 8000rpm - trophy 70cc - yasuni z - fly clutch - stock carb.



    -------
    Last edited by sublunacy; 03-14-2016 at 12:19 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.

  5. #5
    apriliaforum Junkie
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    The last thing Ill update is a 17,5mm carb to a 19mm. Makes no sense to me. If I'd change it, I would atleast go for a 21mm.
    Aprilia SR 50 R Factory 2009 Silver Crowd
    Aprilia SR 50 2008 Silver Crowd
    Aprilia RS 50 2003 SBK Replica

  6. #6
    apriliaforum Junkie
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    http://www.scooter-attack.com/cylind...621476-39.html

    This Airsal 70cc sport is what I had in mind. Not so peaky HP but torque is what is says.
    Aprilia SR 50 R Factory 2009 Silver Crowd
    Aprilia SR 50 2008 Silver Crowd
    Aprilia RS 50 2003 SBK Replica

  7. #7
    apriliaforum expert
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    your all over the map on this one. nothing your saying is correct. the 19mm and 21mm phbg carbs have one more fuel circuit than anything else up to that size. they both fit the 17.5mm manifold aswell.

    the carb size is correct when it is the same size as the exhaust manifold or atleast 80 percent.

    -------
    the airsal is timed very low so it has a lower state of tune than a stock 50cc. the airsal sport is a great choice for an 8000 rpm engine making 8 hp.

    ------
    im editing in a little more info in the above post so its easy to follow completly. check it out again.
    --- 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.

  8. #8
    apriliaforum expert
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    the trophy 70cc is timed higher than ALL other sport cylinders and its not loud. it likes 8600rpm not 8000rpm.
    --- 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 Junkie
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    I am keeping the stock 17,5mm carb. What is Im looking for is a reliable touring scooter with more lower and medium torque.

    To go along with that Airsal Sport I was thinking of this LeoVince Touring pipe. It seems to be alot more quieter thatn the LeoVince ZXR that I have now. It also says that this is a good pipe for a sport 70cc. Also for the low and mid range.

    All I need now is some variator parts. With this mild setup, Im guessing I dont have to update anything? Just replace variator weights, clutch springs and contra spring?

    Re-jetting the carb for 10 up?
    Aprilia SR 50 R Factory 2009 Silver Crowd
    Aprilia SR 50 2008 Silver Crowd
    Aprilia RS 50 2003 SBK Replica

  10. #10
    apriliaforum expert
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    i think an airsal sport engine that has peak torque at 8000rpm for 8hp is good with an 8000rpm lv touring exhaust.

    no changes needed anywhere else.

    i think a main jet kit including 74-86. allso 19mm variator weights - one set at 8 grams and another set of 7 grams. then just mismatch the two sizes till the throttle control is perfect.

    ------
    thats a smart setup/ be proud you asked the right questions and got the info. well 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 Junkie
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    Original mainjet is 53. Upjetting by 20... Sounds way off. I had a 62 when I had my Leo ZXR. Run just fine. Some theory sais that cylinder doesnt affect the mixratio.

    I also think youre too heavy on the weights. I was thinking more like 6 grams and stiffer clutch springs.
    Aprilia SR 50 R Factory 2009 Silver Crowd
    Aprilia SR 50 2008 Silver Crowd
    Aprilia RS 50 2003 SBK Replica

  12. #12
    apriliaforum expert
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    yea 62 main jet atleast. im guessing a 68 main

    the variator weights will need to be plus or minus a half gram of 7.5 grams. that will effect the top speed alot because of the torque driver.

    if you can tune the weights to 1/10th of a gram it could be very good. between 7-8 grams each
    --- 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.

  13. #13
    apriliaforum expert
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    Location
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    if the weights are light by a gram it wont put any power down after 70km/h
    --- 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.

  14. #14
    apriliaforum expert
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    808
    i know what your saying but only recommend systems that work as good or better than stock. if the build is incomplete by 1 item it will be worse than stock so i try to get people back on track.

    your not so much wrong as you are confusing to different systems being the touring class and the sport class. the sport class sucks cause they are the most expensive builds that only make 1hp more than touring class.

    simply the zx was an 8600rpm pipe. the lv touring is 8000rpm. you need 7-8 gram weights and a stock cvt.


    -------------
    sport class does not have the ability to make the bike go faster- it has only 1hp more!
    Last edited by sublunacy; 03-14-2016 at 02:01 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.

  15. #15
    apriliaforum expert
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    look i know this all sounds weird so i assume you will have questions for confirmation. my story changes depending on your expectations- different parts are needed when describing other classes like midrace or sport or touring or full race. they all are built differently- i cant explain everything so im concentrating on making your bike fast as possible everywhere.

    what you have now will be left in the dust by the bike you could have/ built complete to its class.
    Last edited by sublunacy; 03-14-2016 at 03:04 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.

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