Early Husqvarna 371xp's.

[Nicholas]

Hi everyone, say I have a question about a early Husqvarna 371xp. Are their any differences engine wise between the 371xp and the 372xp other than the 372 xp having a 2-ring piston, rev limiting ignition module, different engine timing, and epa/limit cap carburator?

A good friend of mine has a early 371xp, and it cuts circles around my 272xp's, 372xp's, and damn near out cuts my 385xp. The engine sounds much different than any of my Husqvarna 372 xp saws. I thought perhaps the saw was ported/modded. But, after looking the saw over I can't find any evidence of modification. I have no idea where all the power comes from, you could just about stand on the saw and you can't force it out of it's power band.

Someone tell me how this is possible. How I can obtain that kind of power out of my 372's?

Thanks,

Nick Gajewski

 

[donnyman]

Well wish I could help.I have a 272 and its a good saw,cuts like a mad thing.Only problem I notice with it compared to other saws of the same 72 cc engine is she a little hard on the fuel.But then again if you want it to perform you have to feed it the right grocerys.Hopefully some of the husky owners will chime in and explane why Id be interested my self.As I said mine works great and has lots of speed and power for its engine size.Likely has a litte different port timing,or my be the chains on the two saws are different.It dont take much sometimes to make a big differents.Maybe different sprockets.More chain speed.Dont know.Later.Don.

 

[jp hallman]

Haven't had 371's for some years now. I don't remember them being any stouter than my 372's. Owned and used them both during the same time frame. Perhaps your 372 could use a tune-up?

 

[Nicholas]

Thank you to those who have replied. I did some research using the ipl's for both the 371xp, and 372xp. Both the 371 and 372 xp saws use the same piston/cylinder assembly, part number 503 62 64-72. The 371 and 372xp EPA saws use a different piston/cylinder assembly part number 503 62 64-73. The 371 xp uses a Walbro HD6 carburator, whereas the 372xp uses either a Walbro HD12-B EPA carburator, or a HD6-B.

The 371xp uses the following ignition modules:

503 96 24-01 (1997-12)
503 96 24-03 (1999-05)
503 77 90-01 (1996-03) and (1996-09)
503 96 24-01 (EPA)
503 96 24 -03(EPA)
Not certain which ignition module is rev limiting.

All 371xp's use the same flywheel part # 503 51 15 -06, and 503 51 15-05 G

The 372xp uses the following Ignition modules:

503 96 24-05 (1999-11) and (EPA 1999-11)
537 16 22-01 (EPA 2001-10), (2003-10), and (EPA 2003-10)
I am not certain which ignition module is rev limiting.

The 372 xp uses the following flywheels:

503 51 15-05 G*
503 51 15-06*
503 51 15-06 G*

* (1999-11 and (EPA 1999-11)

503 05 16-04 G*
503 05 16-05*
503 05 16 06 G*

* (EPA 2001-10), (2003-10), and (EPA 2003-10)

Thanks again everyone for your replies.

Nick Gajewski
Pulaski, WI

 

[havvey]

371

i have run both and didn't see a lot of difference in stock saws. your 372 could be weak or have an issue or the 371 might have been "tuned up" slightly modded. you will see a big difference in used saws.

 

[HELSEL]

The stock 371 will kill the stock 372!!!!



Rick

 

[Nicholas]

I will have to completely disassemble that 371 xp, and conduct an investigation. I am thinking someone may have ported that saw in the past before my good friend purchased it. My friend purchased the saw used from and local Husqvarna dealer years ago. He swears up and down that that saw is untouched/unmodified. So far all I know is the saw sounds way different than stock 372xp, and is very stout powerwise. The muffler is stock, no mods.

Thanks for the replies,

Nick Gajewski

 

[TimberPig]

If someone did port it, then the modded muffler has been swapped back to stock, because that's the first place that gets modified. There isn't much to gain from porting, if it's choked up with the plugged up stock muffler.

 

[Nicholas]

Here's a few other interesting tid bits on the Husqvarna 371xp I found researching the ipl's.

The 371xp used two different crankcase part #'s:

Part# 503 62 68-71 (106 24 21-61), (1997-12), (1996-03), (1996-09), (EPA 1997-12)

Part# 503 62 68-74 (1999-05), (EPA 1999-05)

The 372xp used one crankcase part # for all saws both EPA, and non-EPA.

Part# 503 62 68-76

The 371xp used 4 different crankshaft part #'s:

Part# 503 72 91-02 (1996-03)

Part# 503 72 91-72 (1996-09)

Part# 503 72 91-74 (106 24 21-64), (1997-12), (EPA 1997-12)

Part # 503 72 91-76 (1999-05), (EPA 1999-05)

The 372xp used 3 different crankshaft part #'s:

Part# 503 74 87-01 (EPA 2001-10)

Part# 503 74 87-02 (2003-10), and (EPA 2001-10)

Part# 503 72 91-76 (1999-11), (EPA 1999-11)


Nick Gajewski
Pulaski, WI

 

[Freakingstang]

I have a couple 371 single ring pistons that are for future builds....

The 371 non epa cylinder has two differant #'s, because there are two differant cylinders, one for the saw and one for the chop saw/concrete saw. As for port timing, the one out of a concrete saw (non epa) had the same timng #'s as the 372 epa. The main difference was in the transfer volume. There is more meat in the concrete jug transfers. They are torque monsters, not meant to be high reving screamers.

As far as 371 non-EPA and 372 epa direct comparisons, I can't help you there...

Steve