Author Topic: Unlimited coil for 372xp timing?  (Read 1248 times)

0 Members and 0 Guests are viewing this topic.

Offline Cut4fun

  • Administrator
  • Nitro Hotsaw
  • *******
  • Posts: 4067
  • Karma: 162
  • OHIO REDNECK
Re: Unlimited coil for 372xp timing?
« Reply #10 on: February 08, 2014, 02:31:52 pm »
The only saws I seen 4 stroking and hitting  the coil limiter to date was the poulan 505 475 I have.  Their dang rev limit coils was around 10something. If I remember right. Crazy low.
REDNECK Saw Repair

Offline Eccentric

  • Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 2110
  • Karma: 217
  • Magnesium and Iron.
  • Location: Northern California.
Re: Unlimited coil for 372xp timing?
« Reply #11 on: February 08, 2014, 03:00:16 pm »
The only saws I seen 4 stroking and hitting  the coil limiter to date was the poulan 505 475 I have.  Their dang rev limit coils was around 10something. If I remember right. Crazy low.

That is really low.  Like a demo saw coil. 
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.

Offline Cut4fun

  • Administrator
  • Nitro Hotsaw
  • *******
  • Posts: 4067
  • Karma: 162
  • OHIO REDNECK
Re: Unlimited coil for 372xp timing?
« Reply #12 on: February 08, 2014, 03:08:21 pm »
The only saws I seen 4 stroking and hitting  the coil limiter to date was the poulan 505 475 I have.  Their dang rev limit coils was around 10something. If I remember right. Crazy low.

That is really low.  Like a demo saw coil. 

Cant remember but thinking both got the partner 5000 coils afterwords. The ones for 55 51 etc work in them too. 
REDNECK Saw Repair

Offline KilliansRedLeo

  • Nitro Hotsaw
  • *******
  • Posts: 2361
  • Karma: 80
  • Location: Rochester, NY
    • RoCHusqvarna
Re: Unlimited coil for 372xp timing?
« Reply #13 on: February 13, 2014, 09:33:25 am »
Good thought to measure before replacing OEM coil! I have run into aftermarket coils that do not have the mounting bolt holes in exactly the same places as the factory coils and sometimes even the core elements are off by a little in relation to the mounting pattern, so you may end up with a ignition timing change just by bolting the thing into the saw! Don't see this much on the later Chinese made coils but did see it a lot in the earlier ones.

You might also want to consider snooping around for a used OEM coil, then you know that the thing is built the was HVA intended it to be built.

"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline eriksat1

  • 4 cube
  • **
  • Posts: 51
  • Karma: 4
Re: Unlimited coil for 372xp timing?
« Reply #14 on: February 13, 2014, 12:31:08 pm »
That is why I am going to check the timing before I take the oem one off, just mark it with a permenant marker at low and high rpm. and see where the new coil is at. In the video it was about right in the middle and didn't change with rpm. Hard to say if you could notice the difference in 2 or 3 degrees either way? You would need a dyno or someone timing your cuts with a stop watch.

Offline 660magnum

  • Global Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 6437
  • Karma: 249
  • For The Love Of Chainsaws
  • Location: NCO
Re: Unlimited coil for 372xp timing?
« Reply #15 on: February 13, 2014, 12:52:09 pm »
There's a thread around here somewhere - a well respected guy was using a timing light. It gave a arbitrary reading, not what I would consider to be a actual reading. It worked out OK for him, for he timed the new type coil to the same number.

My experience with hopping up weed whackers, they are most often in the 22-25 degrees advanced range with the stock flywheel and coil. I put hall effect triggered electronic ignitions with computer controlled timing advance. The total advance I used was 28 degrees with an error towards a little more advance. A 25 -30 cc weed whacker did OK with a fixed advance at 28 degrees but getting into chainsaws above 40cc you need retarded timing to get the engine going of somewhere around 16 degrees without kickback. I always timed them statically with a degree wheel. They timing curve was not too scientific as they were full advance by 5500 rpm.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline eriksat1

  • 4 cube
  • **
  • Posts: 51
  • Karma: 4
Re: Unlimited coil for 372xp timing?
« Reply #16 on: February 14, 2014, 10:27:35 am »
How do you check timing statically with a degree wheel on something without points? I didn't think you could? I did it all the time with old cars.

Offline 660magnum

  • Global Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 6437
  • Karma: 249
  • For The Love Of Chainsaws
  • Location: NCO
Re: Unlimited coil for 372xp timing?
« Reply #17 on: February 14, 2014, 10:46:23 am »
The moment the magnet leaves the coil armature
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

 

Related Topics

  Subject / Started by Replies Last post
8 Replies
730 Views
Last post May 12, 2012, 09:30:03 pm
by Al Smith
timing

Started by jmester « 1 2 3 » Stihl

20 Replies
771 Views
Last post January 17, 2013, 09:06:02 pm
by 660magnum
100 Replies
1782 Views
Last post February 24, 2013, 12:54:05 pm
by jmester
12 Replies
2020 Views
Last post March 27, 2016, 01:48:26 pm
by gregh
6 Replies
226 Views
Last post November 02, 2015, 07:43:33 pm
by Al Smith
26 Replies
1610 Views
Last post May 16, 2016, 09:03:07 pm
by Cut4fun .
2 Replies
642 Views
Last post March 20, 2016, 01:15:19 pm
by 660magnum
5 Replies
154 Views
Last post July 20, 2016, 07:33:47 pm
by 1manband
21 Replies
2543 Views
Last post October 17, 2016, 08:19:31 pm
by dannyupsolate
16 Replies
923 Views
Last post May 06, 2017, 10:33:19 am
by Cut4fun .