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Ft 660 ign timing

Discussion in 'Sub-forum for these Rice Burner 660 builds' started by Ttxpc, May 30, 2018.

  1. Ttxpc

    Ttxpc Well-Known OPE Member

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    As the title suggests, just checked the factory hutzl ft ignition timing and advance curve built in to the hutzl coil.
    Short of it is, 26-27 deg btdc, no advance curve built in, rpm induced retard of approx 2 deg
    About to pull jug and epoxy intake up from 90 to 80,maybe work on raising transfers 10 deg to 120

    Any input on ignition timing numbers these lil chinas like?
    Squish is. 020", I guess a plug chop will tell me where it's at next time oug
     
  2. brshephard

    brshephard Stihl saws, Husky women

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    That's pretty good stock timing.
    28-30° BTDC is about right.
    I'll try to find where I read that later today.
     
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  3. Wonkydonkey

    Wonkydonkey Super OPE Member

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    This was posted a while back, I can’t remember who posted it, but credit goes to them for posting it
    It seems a bit odd there’s no built in adv, only a running retard, I wonder if that’s why the other guy is having probs starting his China-660. It has been said fixed timing coils can be hard to start. 6780B155-F1BF-480E-BAFA-B4B5A32D6483.jpeg
    @Ewing Waymire http://opeforum.com/posts/672289/
     
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  4. Lightning Performance

    Lightning Performance Knuckle dragger swinging member

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    Yuck...
    Plug chop is pointless in a fresh twosmoke.
    The consensus is 80-4 80 builds torque
    120 transfers. If you can get there with out ruining the roof and exit angles.
    100-96 96 has more top end go.
    Good Luck
    Dump that coil on a resale stocker. It will work good.
     
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  5. Redfin

    Redfin Meh...

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    What are you using to read? The light I have would not show any further advance past about 10k.
     
  6. Ttxpc

    Ttxpc Well-Known OPE Member

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    Standard hella timing light no advance/retard, appears to be a fixed ign,
    plug chops are the only way of getting a snapshot of cylinder temps without setting up expensive in cyl monitoring,
    she's had 6 or 7 tanks through so far, for a centrally located plug and such a small chamber I can't imagine its too far away from where it needs to be
     
  7. Ttxpc

    Ttxpc Well-Known OPE Member

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    Oem 660's have inbuilt advance?
     
  8. T.Roller

    T.Roller Huffy and Puffy, Roll Tighter Tater....

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    I'm at a whole keyway advance on my China 660 and it likes it
     
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  9. MustangMike

    MustangMike ONE OF THE GREATEST!

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    Wow, that is a lot. Wonder what the timing ends up being with that much advance?
     
  10. brshephard

    brshephard Stihl saws, Husky women

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    My China saw was at 22° stock. I advanced a whole keyway, it was popping so hard it wouldn't piss rev over 10k.

    Does anyone have a flywheel handy that could measure the ID?
     
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  11. Ttxpc

    Ttxpc Well-Known OPE Member

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    Circ of smooth outer of flywheel is 360mm so 1mm per deg, works out nicely
     
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  12. Ttxpc

    Ttxpc Well-Known OPE Member

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    Went 020" on the keyway, 6 deg, seems to like it, picked up in the cut, leaned it down a little
     
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  13. MG porting

    MG porting Well-Known OPE Member

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    IMG_20180708_100220.jpg IMG_20180708_100311.jpg Funny I got another keyway and took 20" of it and before I changed it out I found TDC and then hit it with the timing light and this is what I found. The top line is where it's running at idle and full throttle now to me that's advanced right from the get go.
     
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  14. backhoelover

    backhoelover SERVICE MANUAL MASTER

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    for all you guys that do port work and mess with timing echo makes a unit called the pet 9000 i got one and love it. been a many of time i would have thought it was the carb causing the problem but was the coil. here is the manual ill get a pic as soon as i get home from work
     

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