Results 1 to 8 of 8

Thread: Aprilia sr50r 70cc kit problems

  1. #1
    apriliaforum newb
    Join Date
    Jun 2017
    Location
    UK
    Posts
    3

    Aprilia sr50r 70cc kit problems

    So i bought a 70cc kit to go on my sr50r carb and it was a full kit, it was very hard to get the cylinder onto the piston but i managed to do it, it was very tight. It doesnt turn over on the electric start and i havent tried it with the kickstart as its broken and i have parts coming tomorrow to fix it.

    Has anyone else had this problem? it does turn over i have to use a ratchet on the variator though.

    thanks!

  2. #2
    apriliaforum expert
    Join Date
    Jul 2015
    Location
    ontario
    Posts
    808
    sounds like it didnt go well for you.

    -pull it apart and i can run you through a bunch of things to check.

    ------
    we can check the block also but i assume you want to start at the top so pull it off and look for friction marks and test the piston fit and ring gap.....
    --- 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 newb
    Join Date
    Jun 2017
    Location
    UK
    Posts
    3
    shall i try it how it is tomorrow with the kickstart?

  4. #4
    apriliaforum expert
    Join Date
    Jul 2015
    Location
    ontario
    Posts
    808
    what do you think?
    --- 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 newb
    Join Date
    Jun 2017
    Location
    UK
    Posts
    3
    I have no idea ahah thats why im asking you

  6. #6
    apriliaforum Junkie 2Strokesforlife's Avatar
    Join Date
    Aug 2016
    Location
    Jenison, Michigan
    Posts
    359
    Ouch, when you squeeze the piston rings together to get the piston into the cylinder, it should slide right in. You're going to have to take it apart and check a couple things. Never force it, and if you try the kickstart, it may do more damage if it hasn't already...
    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

  7. #7
    apriliaforum Junkie
    Join Date
    Jan 2005
    Location
    Finland
    Posts
    368
    Is the piston in the right way? Arrow facing towards the exhaust port?
    Aprilia SR 50 R Factory 2009 Silver Crowd
    Aprilia SR 50 2008 Silver Crowd
    Aprilia RS 50 2003 SBK Replica

  8. #8
    apriliaforum Member
    Join Date
    Dec 2015
    Location
    Cambridge, MA
    Posts
    126
    be sure you have the rings installed properly...theres a gap in the rings that allow them to expand and compress...be sure is lined up with that lil tab on the piston in the ring groove..also be sure you put the rings on the right way...if they are upside down they wont compress properly when you try to put the cylinder on.....if you want, snap a couple pics of your piston with rings and ring gap and i can help
    2004 Aprilia Mojito Retro 50cc
    2003 Vespa ET2 50cc
    2001 Triumph TT600
    1993 Yamaha Razz 50cc

Similar Threads

  1. Aprilia SR50R top speed problem
    By msatasa in forum Scarabeo 50, SR50, Mojito 50, Rally, Fly 50
    Replies: 14
    Last Post: 04-27-2015, 11:58 PM
  2. 2007 SR-50 with Polini 70cc kit..Problem with misfire at 1/2 - WOT
    By BadR1 in forum Scarabeo 50 Ditech, SR 50 Ditech, SR Factory
    Replies: 18
    Last Post: 02-14-2013, 07:44 AM
  3. aprilia rs50 70cc kit squish band size for domed piston
    By jellex customs in forum RS50 Technical
    Replies: 9
    Last Post: 08-21-2012, 09:59 AM
  4. Aprilia sr50r factory aceleration problem
    By Lukkkss in forum Scarabeo 50 Ditech, SR 50 Ditech, SR Factory
    Replies: 3
    Last Post: 10-01-2007, 05:38 PM
  5. 70cc kit problem
    By AJ_105 in forum Scarabeo 50 Ditech, SR 50 Ditech, SR Factory
    Replies: 3
    Last Post: 11-14-2006, 11:09 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •