Results 1 to 9 of 9

Thread: APRILIA SR50 www 1998 aircooled Minarelli engine

  1. #1
    apriliaforum newb
    Join Date
    Sep 2017
    Location
    Jerez de la Frontera
    Posts
    5

    APRILIA SR50 www 1998 aircooled Minarelli engine

    Help, my new old bike start but comes down after a minute. I have cleaned carburator twice. It only start with starter on.
    Last edited by apercas; 09-05-2017 at 04:56 PM.

  2. #2
    apriliaforum Member
    Join Date
    Dec 2015
    Location
    Cambridge, MA
    Posts
    136
    i think your idle jet is still clogged...take it apart, pull out that pilot jet and see if you can see light through it....i use a nylon bristle from a brush to help clean
    2004 Aprilia Mojito Retro 50cc
    2003 Vespa ET2 50cc
    2001 Triumph TT600
    1993 Yamaha Razz 50cc

  3. #3
    apriliaforum newb
    Join Date
    Sep 2017
    Location
    Jerez de la Frontera
    Posts
    5
    Thanks a lot for your answer, Jixaw.

    That was my first idea, and so I cleaned all the jets inside the carburator till I can see light through them. On the other hand, the bike has been parked outside a lot of time, so I am not really sure if the fuel tank or the pipes could bring some dirty and clog the jets again. I´ll try cleaning again as you recommend me.

    But... do you think the engine crank oil seals could be the problem? they tend to dry out and fail if the engine sits without being used. If they are hardened could cause the symtoms my bike has?

    Finally, I have another problem (this is smaller I think). When I took appart fairing I found a White-clear blue wire with black terminal but I dont know where It must be plugged, since I have read that wire is for watercooled versión and goes to the termistor I haven´t....

    Regards.

  4. #4
    apriliaforum expert
    Join Date
    Jul 2015
    Location
    ontario
    Posts
    860
    any seal or gasket problem will look like a fuel leak.

    try a new sparkplug and install a fuel filter. the paper filters are best.

    clean the brass jets again in the carb.

    use red synthetic oil not the green stuff.

    ttyl
    --- 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
    Sep 2017
    Location
    Jerez de la Frontera
    Posts
    5
    Quote Originally Posted by sublunacy View Post
    any seal or gasket problem will look like a fuel leak.

    try a new sparkplug and install a fuel filter. the paper filters are best.

    clean the brass jets again in the carb.

    use red synthetic oil not the green stuff.

    ttyl
    Thank you for your help.

    I have a leak from the right hand of the engine, may be from the seal, thats why I doubt if the stop can be caused fue a lost of compression.

    I use syntetic Repsol oil.
    Cleanning again carb is a pendant homework.

  6. #6
    apriliaforum expert
    Join Date
    Jul 2015
    Location
    ontario
    Posts
    860
    ok that sounds good. talk soon!
    --- 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. #7
    apriliaforum newb
    Join Date
    Sep 2017
    Location
    Jerez de la Frontera
    Posts
    5
    Hi again,
    This evening I had a while to take the carb out... Surprise! There was dust on the pot, but the jets seemed to be open as I saw light through them. I dont know if the bike stops cause the dirty carb, but I learned two things: I cant clean carbs and my tank and pipes bring lots of sh..t.
    I have never disconnect a tank to wash it because it scares me, but I supposse it is the next step.

    Thanks again for your support!

  8. #8
    apriliaforum Member
    Join Date
    Dec 2015
    Location
    Cambridge, MA
    Posts
    136
    its possible debris is getting into the carb from the tank....you can always put an inline filter on the hose that feeds from the take to the carb.....
    2004 Aprilia Mojito Retro 50cc
    2003 Vespa ET2 50cc
    2001 Triumph TT600
    1993 Yamaha Razz 50cc

  9. #9
    apriliaforum newb
    Join Date
    Sep 2017
    Location
    Jerez de la Frontera
    Posts
    5
    Quote Originally Posted by jixaw View Post
    its possible debris is getting into the carb from the tank....you can always put an inline filter on the hose that feeds from the take to the carb.....
    Sure! I have just bought one and new pipes. Hopefully tomorrow I could fit the carb and the nee pieces. I'll keep you informed of the results.

    Cheers!

Similar Threads

  1. Aprilia SR50 2006 Shuts down when engine warms up
    By huryt in forum Scarabeo 50, SR50, Mojito 50, Rally, Fly 50
    Replies: 2
    Last Post: 03-26-2014, 03:23 AM
  2. Top end rebuild on 2001 sr50 www Minarelli carb engine
    By Greenwoodsg in forum Scarabeo 50, SR50, Mojito 50, Rally, Fly 50
    Replies: 1
    Last Post: 12-17-2013, 03:27 PM
  3. 1999 Aprilia SR50 www Carb Backfire and headlight turning off
    By dwang34 in forum Scarabeo 50, SR50, Mojito 50, Rally, Fly 50
    Replies: 0
    Last Post: 10-07-2010, 04:48 PM
  4. Aprilia SR50 ditech to carb engine ?
    By Jackniksmith in forum Scarabeo 50 Ditech, SR 50 Ditech, SR Factory
    Replies: 2
    Last Post: 08-07-2009, 08:55 AM
  5. Help with aprilia sr50 engine
    By cjm198721 in forum Scarabeo 50, SR50, Mojito 50, Rally, Fly 50
    Replies: 2
    Last Post: 02-19-2009, 06:06 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
  •