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Hesitation in acceleration - Yamaha RX 135 5-speed

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  • Hesitation in acceleration - Yamaha RX 135 5-speed

    Hello all,

    I have been experiencing a unique problem for quite some time now with my Yamaha RX 135 5-speed.

    Problem: There is a lag in acceleration as I open the throttle. It feels as though the engine is struggling to reach the speeds though it eventually does but after a lot of struggle. The bike does still reach 100-110 kmph but the initial pick up is really delayed.

    Background: The engine was completely done up 4 years back. Re-bored to 1.25 or 1.5 (not sure which one). Mostly Top Pro piston (as I was not there during the assembly), new connecting rod, new engine bearings (SKF), new air filter, new steel plates as well as friction plates, new chain sprocket (15 / 38). All other parts are stock such as carburettor , air filter, reed valves etc. (Note: no porting has been done)

    Troubleshooting: I already swapped the carb, reed valve, ignition coil with another stock Rx 135 5-speed but the problem persists. The only part I haven't checked is the stator coil.

    I would really appreciate if anybody could shed some light if they faced a similar issue and fixed it or could recommend a solution to my problem. My mechanic also has no clue as he recently opened the bore to check if it had any lines but its as good as new.

    If you need any additional information please let me know.

    Thanks!
    Last edited by xBhp; 08-28-2019, 11:59 AM.

  • #2
    Re: Hesitation in acceleration - Yamaha RX 135 5-speed

    Thread approved.

    Comment


    • #3
      Re: Hesitation in acceleration - Yamaha RX 135 5-speed

      Originally posted by 2strokehead View Post
      Hello all,

      I have been experiencing a unique problem for quite some time now with my Yamaha RX 135 5-speed.

      Problem: There is a lag in acceleration as I open the throttle. It feels as though the engine is struggling to reach the speeds though it eventually does but after a lot of struggle. The bike does still reach 100-110 kmph but the initial pick up is really delayed.

      Background: The engine was completely done up 4 years back. Re-bored to 1.25 or 1.5 (not sure which one). Mostly Top Pro piston (as I was not there during the assembly), new connecting rod, new engine bearings (SKF), new air filter, new steel plates as well as friction plates, new chain sprocket (15 / 38). All other parts are stock such as carburettor , air filter, reed valves etc. (Note: no porting has been done)

      Troubleshooting: I already swapped the carb, reed valve, ignition coil with another stock Rx 135 5-speed but the problem persists. The only part I haven't checked is the stator coil.

      I would really appreciate if anybody could shed some light if they faced a similar issue and fixed it or could recommend a solution to my problem. My mechanic also has no clue as he recently opened the bore to check if it had any lines but its as good as new.

      If you need any additional information please let me know.

      Thanks!
      1) Might be an issue with the bore and piston then and the bearings. Regarding those was the engine touched up before then?

      2) on the sproket teeth, the current one as you mentinoed is 15/38 what was the ratio before?

      3) last; bikes simply old, germlins have crept in.

      Comment

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