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Metering diaphragms ..hooked or not

Discussion in 'Carburetors' started by Simondo, Mar 14, 2019 at 4:54 PM.

  1. Simondo

    Simondo Pinnacle OPE Member

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    Tillotson (and some Walbro) show a hooked and none hooked diaphragm for the same carb. There is also some mis matching in what you get in some carb kits iv found .

    Tillotson HS.....

    Screen Shot 2019-03-14 at 20.43.24.png
    What do we think could be the reason for a hooked diaphragm as there are plenty of carbs (including this one ) that dont use or need a hooked on one.
     
  2. 67L36Driver

    67L36Driver ONE OF THE GREATEST!

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    I’ve no real evidence but I suspect that a large displacement saw with a strong crankcase impulse might call for a ‘hooked’ diaphragm to positively close the needle valve.

    Pure speculation on my part.
     
    Junk Meister likes this.
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