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Thread: 85mm stroke crank, need help

  1. #46
    apriliaforum expert
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    well dont do that or it will blow up and over rev. good luck!
    --- 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.

  2. #47
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    That did not help. Spins good but no start. Only makes a quiet bang in the exhaust once. Like a "tzub" sound and then. Nothing. So out of ideas. Did spray thro carb with and without throttle open.
    Aprilia SR 50 2008 Silver Crowd
    Aprilia RS 50 2003 SBK Replica

  3. #48
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    i saw the video of the spark. i can not tell if it is a thin blue spark or a fat kernel in the white/yellow/orange range? do you have an idea that it is as good as a japanese car or shity like a 1980 4 stroke lawnmower?
    --- 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.

  4. #49
    apriliaforum expert
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    what im saying is check the spark quality like i said above. then take the sparkplug wire off by unscrewing the cdi and sparkplug head. now mark the depth with tape. then screw the cdi and cap back on all the way.

    check the spark quality again and use a new sparkplug for both tests.
    --- 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. #50
    apriliaforum Junkie
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    Ive tried with a functioning spark AND I also did buy a brand new spark. No help. Could the stator be gone once again? I do have a new one in a box so I could try with that. Also I have a functioning cdi to try.

    Last time when the stator went I tried to measure currents and what not. Did absolutely no good for me so I just started changing parts. It gave spark but stator was gone. maybe its that all over again.
    Aprilia SR 50 2008 Silver Crowd
    Aprilia RS 50 2003 SBK Replica

  6. #51
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    Quote Originally Posted by sublunacy View Post
    i saw the video of the spark. i can not tell if it is a thin blue spark or a fat kernel in the white/yellow/orange range?
    its just an idea. people get bad spark from the sparkplug wires not screwed in all the way.
    --- 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.

  7. #52
    apriliaforum Junkie
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    Quote Originally Posted by sublunacy View Post
    its just an idea. people get bad spark from the sparkplug wires not screwed in all the way.
    Yeah I know. Have experienced with that before. This is not the case. Im waiting for some tools to arrive, actually been waiting for them for 2 months now from a webstore, paid and everything but its been a hazzle to get them even admit that they have not sent me everything I ordered. that includes battery operated ryobi impact wrench.

    Maybe I should buy a vespa or a gilera runner 50.
    Aprilia SR 50 2008 Silver Crowd
    Aprilia RS 50 2003 SBK Replica

  8. #53
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    there are 50-80cc mopeds and the insurance would be 1/4 the price. same engine with lots of transmission options. lots of pipes and awesome to work on.

    or get a 125cc two-stroke or 4 stroke with cvt that can handle riding 2-up at highway speeds to far away destinations.

    ---
    theres so many bikes now... derbi senda motard in 50-125cc.
    suzuki rv200/tu250
    honda/ kawi 125 peewee motards


    i would be happy working on any of the top 50 models. but buying a cvt bike that cant do 60mph again sounds kind of crazey by textbook deffinition. if its good enough it would be a 125-200cc two stroke. we are all just grasping what they left us.

    aprilia rs125
    --- 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. #54
    apriliaforum Junkie
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    Changed cdi and stator. No difference. Next thing is to change the crank to oem.
    Aprilia SR 50 2008 Silver Crowd
    Aprilia RS 50 2003 SBK Replica

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