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Slow running

Home Forums Main Forum Slow running

This topic contains 12 replies, has 5 voices, and was last updated by Ian Bradshaw Ian Bradshaw 1 week ago.

  • Author
    Posts
  • #5867
    Ian Bradshaw
    Ian Bradshaw
    Participant

    When I try to get a good tickover by adjusting the pilot air screw I find that the more I screw them in the faster the engine runs, basically enriching the mixture. However when I shut the throttle it takes a long time to return to a lumpy tickover but the pickup at low speed is good. However if I set the carbs to a smooth tickover it tends to give a lumpy ride at low speeds, up to 30mph. I have read on one of the forums on facebook, either TR3OC or Chris Rooke’s that someone else who had this problem changed their spark plugs to B7ES rather than B8ES which I am running. Has anyone had experience of this as I am concerned that running the hotter plug may give more problems. I am running a set of new Amal Premier carbs.

  • #5868

    michael chappell
    Participant

    I’m having problems with my Rocket 3 mk1

    I can not get it to tick over seems to be nothing below 3000 races and the motor is running so hot

    It’s discolouring the exhaust pipes, has electronic ignition set at 5000 revs can anyone give me any advice with this.

     

    • #5871
      David Lord
      David Lord
      Keymaster

      Michael what is the history of the bike/carbs? It sounds like you have blocked pilot jets

      • #5872

        michael chappell
        Participant

        David rocket has had new rings valves ground in

        Carbs are standard with all standard size jets.

        Bike came in from USA been stood a while.

        I’ve blown carbs out with air line.

        Bike starts second or third kick but needs a lot of throtle. But no tick over just dyes.

         

      • #5873
        David Lord
        David Lord
        Keymaster

        OK but just to be sure, have you followed the info shown here? http://www.jba.bc.ca/Bushmans%20Carb%20Tuning.html

    • #5874

      Dick Herzberg
      Participant

      Hi Michael, there can be a few reasons for discoloured pipes, on the Triples it is quite normal for them to discolour when using the maximum revs, one is retarded ignition, you say it is set at 5,000 rpm, set what is it set at 38 btdc? With you saying 5,000 rpm you have an electronic ignition fitted as points are set static with the ARU fixed in full advance and checked with a strobe. Cheers,

      • #5876

        michael chappell
        Participant

        Hi Dick

        Fitted Boyer Bransdon electronic ignition set as spec sheet. Then set using strobe at 5000 rpm.

         

         

  • #5870
    David Lord
    David Lord
    Keymaster

    Ian, I doubt it is a spark plug issue. I’m sure I’ve read somewhere that the pilot jet fitted in the premier carb needs to be changed to a different size. It sounds to me like yours may be too rich.

    • #5877
      Ian Bradshaw
      Ian Bradshaw
      Participant

      Hi David, My thoughts precisely, that’s why I queried the spark plug route. Nice to have confirmation of my thoughts. Thanks, ian

  • #5880

    Gary Westwater
    Participant

    Hi Ian,

    I agree with david about the pilot jets. My bike has new alloy Premiers fitted. It ticks over ok but is a bit hesitant picking up from low revs. Air screw is about 1 turn out. I’ve bought #19 pilot jets to try, on the recommendation of others who know a lot more than I do, though I have still to fit them. They were cheaper from RGM. If you have the kit, then you can drill them out yourself.

    Gary

  • #5881
    Ian Bradshaw
    Ian Bradshaw
    Participant

    HI Gary, Thanks for your reply. I have been having a play and have improved both tick over and pick up. I have the two outer carbs with the air screw out about 1 3/8 and the Centre Carb 1 1/8. Unfortunately I found a slight weep of oil from the rear rocker box so going to see how the bike runs from cold after I have fixed the leak. Please let me know how your bike runs after you have changed the jets. Cheers, Ian

  • #5883
    David Lord
    David Lord
    Keymaster

    Ian, if it helps, my experience of setting the air screws is to start at 1 1/2 turns out, adjust them for highest speed tickover and then turn them weaker (by usually about 1/4 turn), testing for responsive when blipping the throttle as you make small 1/8 turn adjustments. Finally of course adjusting the throttle stop to give about 1,000 rpm tickover.  It takes quite a bit of trial and error but once you get into the right area with the air screws you can really fell the difference and I usually make final small adjustments when riding it rather than in the garage where the engine tends to overheat.

    • #5884
      Ian Bradshaw
      Ian Bradshaw
      Participant

      Hi David an Gary,
      I have not had chance to give the bike a run from cold yet but from my hot run the bike felt considersbly better. Gary, I have Premiers and the Pilot Jets are screwed in and are interchangeable so you may not have to drill them out. Thanks to you both I will let you know how I get on. Sunday seems to be the first chance of a ride. Ian

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