821 Jerky Throttle

Discussion in 'Monster' started by Moorland Monster, Aug 31, 2025 at 8:19 PM.

  1. Had my Monster for 3 years and done 7000 miles on it. Back in June last year I noticed it was developing quite a jerk on the throttle. I've done 1800 miles since.

    1) For the first 20 mins or so of a ride, the bike feels fine and smooth

    2) When the jerking starts it's quite noticeable at around 4k. There will sometimes be a slight drop in power as it briefly comes and goes.

    3) I've changed back to stock end can after having my SC project can on there: no change

    4) I've deleted the exhaust servo: no change

    5) It happens at any level of fuel

    6) Happens with E5 and E10

    7) Had a new air filter on annual service about 1 year ago

    Bit stuck as to where to go next. Friend has suggested it might be a coil pack on the way out, esp as intermittent. Motah is an 821 Testastretta 11* which was also used in the hyper. Does anyone have any suggestions or things to try? Or is this something that happens all the time and I only noticed it last year?
     
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