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#Post#: 90938--------------------------------------------------
Husqvarna chainsaw coil info by spike60
By: Cut4fun Date: October 27, 2024, 6:29 am
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[member=38]Spike60[/member] coil info. This way dont have to
wade threw all the garbage postings elsewhere for pages to get
the good stuff.
Gonna try and answer a bunch of questions all at once here. Most
of us are fixated on cylinder kits cause you can mess around
with them and see what's going on in there. But there is little
discussion on the coils. Many guys ask about 372's, but there's
some overlap with other models and much confusion about the
speed limited coils. It's not just a matter of RPM's with coils.
There are different advance and start curves in most of the blue
coils that are tailored to whatever saw they are in. Mostly
going to cover the 300 series models, because most of these
coils will fit in different saws, but sometimes it's not a saw
it should be in. Most of the speed limited coils can still be
used, but you just need to pay attention. This might get long
winded. :)
Starting with the 2 non-limited coils that fit most of these
saws. Part numbers are very similar. What is different about the
coils is there is one for the smaller flywheel saws like the
346-357 along with the 334T top handle family and even the
455/460 Ranchers which are still using it. Part number: 544 047
001. The second is for the 372-390-575/576 larger flywheel saws;
544 047 101. I haven't always paid attention to this, and the
slight difference doesn't seem to matter, but you will notice it
when setting the gap. These are bootless from the factory, so
they all have to be trimmed and have the boot installed.
372 chassis: There's a stupid amount of 372 coils, because the
XT coils are different than the OE stuff. Main difference on the
blue speed limited coils is that the OE's went to 13,600 and the
XT's only go to 13,300. The 365's all have the same coils as the
372's, so even in the case of the 365 Specials that were
supposed to rev to 12,500, they never used a lower RPM coil. No
problem taking them up to 13,500 with whatever cylinder you put
on them. The XT coils went back and forth with digital advance,
and different advance and start curves to improve idling and
starting. The newest XT coil has a new start curve that
eliminates the misfire that you would get with a half hearted
pull on the rope and make you think the coil was going bad. Idle
and acceleration also seem better. This coil comes with the boot
and is the only one I use on these saws now, and it doesn't seem
to matter which carb is on the saw, (not the case with some
other XT coils). I prefer it on XT's over the black coil. Husky
is coming out with coils that will fire at lower RPM's to make
starting easier on some saws. (The new 445/450 have a coil that
fires at something like 700 RPM vs 1400 on the older version.)
Thing you have to watch for when doing a mix and match is the XT
uses a longer coil wire for the taller cylinder. The shorter
wire from an OE will rub on the cylinder fins and ground out
before too long. This can even happen going the other way as you
have an extra bit of wire to hide in there. Always snap it into
the little slot on the top cover, and be wary of shoving down to
where it might get caught in the flywheel.
346 chassis: Big thing to be aware of here is when converting
350's to 346's because the speed limited coils on the later
350's only revved to 13,000. I've seen guys pop a 346 kit on
there and then try and tune it up and end up blowing it up. The
346 OE apparently never came with a speed limited coil, but the
NE version was limited to 14,100. Otherwise there isn't much to
look for here.
357 chassis: Don't think they ever stuck the blue coils in these
saws, so there's not much to worry about here either. Coils
interchange with the 346 chassis, but again you've got the
different plug wire length to deal with.
390: I can't remember if the 385's ever got the blue coils or
not, but safe to say the 385's should have a black coil and the
390's will have a blue one; limited to 13,000. 372XT coils
should have about the same length wire, and I want to try the
new XT coil in one of these saws.
575/576- Blues coils in these saws are limited to 13,300. The
deal with this chassis is that the 576AT has it's own coil which
is gray in color. The saw will absolutely run like crap without
the gray coil.
The 550's and 562's are actually a lot better in the mix and
match department. Just about any carb will work with any coil,
which is nice of them as they each have about 5 different coils
at this point. You just have to plug them into the CST and
update the firmware to the proper coil. The one exception here
is on the early 562's with the EL44 carb, as those coils operate
at 8MHz and the rest are at 14MHz. Probably make for screwy
running saw if it ran at all.
#Post#: 90939--------------------------------------------------
Re: Husqvarna chainsaw coil info by spike60
By: Cut4fun Date: October 27, 2024, 6:34 am
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When I said "any carb" I meant any of the different 550 or 562
carbs. There are no non-AT carbs that would fit those saws.
The first XT's were a royal pain to get to idle correctly. The
first coil change was to a coil with a digital advance. The
advance was supposed to kick in at about the same RPM as clutch
engagement, which is about 3500. But you'd get this real
annoying surging with some of the early saws at an lower RPM as
the advance was kicking in and out. And they'd all come out of
the box with the idle a little too high making it worse.
There was also a change to the carb at the same time and the SB
said that you had to change them together. Never really
understood that as there's no electronic connection to the carb.
Some of this came into play when you swapped coils at Walt's.
I'll put some part numbers up later today. It's really the XT's
where you'll notice some of this stuff. The 372OE's weren't as
fussy with the coils.
#Post#: 90945--------------------------------------------------
Re: Husqvarna chainsaw coil info by spike60
By: Chainsawrepair Date: October 29, 2024, 6:29 am
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CRG FB. We all went through all the 351 353 OE NE 346 OE NE
and 2152 OE NE 2153 NE for their coils. Blue 14.1K in NE 2153
346. Black unlimited in 2152 351 353 and OE 346
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