Ft 660 ign timing

[Ttxpc]

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

 

[brshephard]

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

 

[Wonkydonkey]

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.
@Ewing Waymire http://opeforum.com/posts/672289/

 

[Lightning Performance]

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

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.

 

[Redfin]

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

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

 

[Ttxpc]

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

 

[Ttxpc]

Oem 660's have inbuilt advance?

 

[T.Roller]

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

 

[MustangMike]

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

 

[brshephard]

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?

 

[Ttxpc]

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

 

[Ttxpc]

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

 

[MG porting]

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.

 

[backhoelover]

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