Author Topic: Ts 400 ignition coil problem  (Read 618 times)

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Offline rolla nz

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Ts 400 ignition coil problem
« on: June 22, 2015, 03:04:02 am »
Hi all
I have a problem with my ts400
it is an older type with the 3bolt coil and I have replaced it with a newer 2bolt coil
I have spark from plug to body but when the plug is in it wont seem to fire and backfires. Do I have to get the coil with the 3 bolt holes?
i noticed some parts places in the USA say on there website 3bolt and 2bolt are not interchangerble?

thanks Shane

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Offline 660magnum

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Re: Ts 400 ignition coil problem
« Reply #1 on: June 22, 2015, 03:28:44 am »
I think your timing is off with the 2 bolt coil?

The backfiring is the give away to a timing problem.
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Offline rolla nz

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Re: Ts 400 ignition coil problem
« Reply #2 on: June 22, 2015, 03:44:36 am »
thanks for your reply 660
ohh right from where the coil and the magneto meet at that point?

ok looks like i will get a 3bolt from the states and try again :)

Offline 660magnum

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Re: Ts 400 ignition coil problem
« Reply #3 on: June 22, 2015, 03:52:26 am »
There's typically a problem with newer design coils being installed at the exact position of the old coil . . .

And the result is the timing is off due to a secondary winding having been added inside the newer coil to provide a timing advance with rpm.

If you could set the timing correctly by rotating the flywheel position relative to the key way . . . The saw should run fine?

This is accomplished with a degree wheel and timing light. The figure for the old fixed advance coils is between 20 & 25 degrees advanced.

The standard figure for advanced timing at 5000 rpm or higher is 28-30 degrees. But 28 degrees at starting will jerk on your fingers.
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Offline rolla nz

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Re: Ts 400 ignition coil problem
« Reply #4 on: June 22, 2015, 04:50:45 am »
ok thankyou for that info
that could be a job for the stihl shop I think:)
not that they seemed to know much here in NZ

Offline 660magnum

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Re: Ts 400 ignition coil problem
« Reply #5 on: June 22, 2015, 05:03:08 am »
This is often done by chainsaw racing guys but rarely done at a Stihl Dealer repair shop.

All this is explained by others somewhere on this site in a thread.
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Offline Fish

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Re: Ts 400 ignition coil problem
« Reply #6 on: June 23, 2015, 01:36:09 pm »
I have seen lots of trouble with the kill wire on these units, try running with it unplugged just to be sure.

 

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