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JS Motorsport breather

Discussion in 'Norton Motorcycles (Modern)' started by ntst8, Apr 28, 2019.

  1. ntst8

    ntst8 VIP MEMBER

    Feb 14, 2004
    Great day out today, 250 miles of twisting back roads and came home just short of clicking over 6000 miles. :D
    Oil in airbox - 100mls or so drained after the run, a bit down from what it has been but obviously not the magic bullet.
    General performance - it does seem to run more smoothly at low revs (but maybe i just it want it to feel like that), and the idle has dropped from 1600 to, usually, 1300 although a couple of times it stayed higher.
    Gripe - steel chainguard broke at the front mount. Nothing unusual i believe but i don't much like the look of the CF one so surgery to be arranged.

    Edit - i am still running the original shorter dipstick, oil level just on the stick at the start of the ride.
    Last edited: May 4, 2019
  2. swooshdave


    Apr 15, 2009
    I did that. It’s not going to do any harm but I’m not convinced it’s going to make a difference either.
  3. Britfan60

    Britfan60 VIP MEMBER

    Jan 5, 2014
    I cha ged from shorter to longer dip stick. No significant difference. I was center of marks on the short sit k and 2\3 up the knurled section of the longer stick.
  4. ntst8

    ntst8 VIP MEMBER

    Feb 14, 2004
    Have been reading up on crankcase breathing on air cooled Ducati's (as something akin to the Norton) and it seems that their breather spits out oil when the engine suffers "excessive blowby". I also see TonyA's comment in the Lean?? thread about his oil issue reducing with a well bedded in set of correctly fitting rings. And finally i recently read one of Richard-7's past comments suggesting the same. So no more mucking about with this until the engine has had a birthday, which will be a month or few.
    richard-7 likes this.

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