Husqvarna problems 372 X-torqs & 570-576's

[Cutmaster]

Husqvarna problems 372 X-torqs & 570-576's
Jonsered CS 2172's
horrible to start hot or cold
runs too hot
hard to start once warm
finicky on high rpm
does not come back to an idle very quickly after falling tree
leak chain oil while sitting
100hrs runtime max on each saw
20" Bars, Oregon 73LGX072G Chains
Tried 100 octane Use ethanol free unleaded gasoline @ 50:1 & 40:1 ratios
Husqvarna XP Professional Performance Oil
Tried Husqvarna Pre-Mixed Fuel same problems.
Is this just the nature of these saws?
No adjustment we try seems to help.

Are the Husqvarna 390xp & Jonsered CS 2188's X-Torq's now too?

Original Husqvarna 371 & 372's ran great from -20 to 110 degree days.
We keep rebuilding our old Husqvarna 371's & 372' & Jonsered 2171's
because they just work all day everyday, problem is cases, plastics ect.. get screw holes worn out.

Do we buy Tanks & Cases from HLSupply over OEM to cut the cost down?
Good Quality Cases?

Thanks!

Steve

 

[mdavlee]

The 372 tuned different than the old style. An unlimited coil seems to help. Sounds like they're lean on the L.

 

[beaglebriar]

Trim the limiters and retune.

 

[Cutmaster]

Exactly, they all run very lean.
I like a nice "tan" color on the spark plug like I get from my 371's, 372's, & 2171's
You can 4 Stroke these Phase 1 saws no problem, you can get them to run so rich at WOT it's like sending smoke signals.
All X-Torque saws have a very light touch of tan but mostly yellowish white color on the plugs,
No matter what we do they won't stay running the least bit rich.
When running in red oak Tune the saw so it's slightly rich, after 1 tank of gas saws go right back to running lean, re tune to run slightly rich and saws go right back to running lean. Repeat, Repeat, Repeat.
Maybe this will help:
I own a Logging & lumber company I started it back in 1982, between 3 & 8 men running saws at least 10hrs a day 6 days a week.
In winter temps reach -20 ( Northern Minnesota ) Summer temps reach upper 90's.
These saw run Hard all day everyday non stop.
371, 372, 2171 = # 503281805 = Walbro HD-12 Carb / Remove Limit Caps & Can Tune Easily
372 X-Torq = 522858701 = Walbro RWJ-4 Carb / Remove Limit Caps & Will Not Stay In Tune, Runs Very Lean Again,
On 1 Saw my Dealer replaced Cylinder, Piston & Carb. Saw Ran Great for a week, then started running lean again,
even melted the blue cap off the decompression valve.
Anyone know if I can replace the Walbro RWJ-4 Carb with the Walbro HD-12 Carb?
570, 575, 576 = 580735801 = Zama C1M-EL28 Carb / Remove Limit Caps & Cannot Stay In Tune, Runs Very Lean Again.
576 XP Auto Tune I'll just sell these, they don't run for crap, 1 stalled & died on me felling an 80' white oak, it damn near killed me.
I cannot believe these Auto Tunes are Professional Logging saws.
Also, All X-Torq saws loose compression very fast, say 175PSI new drop to 140-130PSI after 60-70 Hours.
I'm sure this is because these saws are running too lean / hot.
Stihl guys are going to say to buy Stihl, however I have always had 2 problems with Stihl.
Closest dealer is 2 hours away & I need to buy my parts online, very hard to find IPL's for Stihl, beside that I have roughly 50 of these X-Torq saws, I'm in these too deep.

 

[Cutmaster]

What is the part # for the unlimited coil?
Black coil right?
Is it 544 04 71-01 if so it supersedes to # 510 11 49-01 & this is a limited blue coil isn't it?

 

[beaglebriar]

You probably have to go aftermarket to get the unlimited coil.

 

[mdavlee]

There's several Oem unlimited coils. I buy mine,from eBay for $10-25 each. I swap those carbs into the olds saws all the time. They have a bigger venturi

 

[pro94lt]

Here's my .02 They definitely sound lean... Also my xt 372s seem to idle around and very idle rpm say 200rpm? Could that be altering how you tune them? And are they pushing the decompression release after their hot? If it ever gets pushed on mine when hot seems like they'll flood.

 

[weedkilla]

A husky 390 is the last husky in this size that's still an old school style motor. And it doesn't feel much heavier than a 576.
I'll leave these other lads to help you with the 372 - it's a size I don't bother with.

 

[cus_deluxe]

im surprised nobody has hassled you about the mention of 50:1 . the whole idea of the xtorq and auto tune is for them to run lean (and hot). limiter trim and tune will help (maybe a muff mod?) i bet there are quite a few guys on here that will tell you youre crazy if you run anything less than 32:1 for production felling type work. my guess if youre having similar problems with a bunch of saws, there must be something in the fuel/oil/tune/operation that they arent liking. my (nearly worthless) $.02

 

[pro94lt]

im surprised nobody has hassled you about the mention of 50:1 . the whole idea of the xtorq and auto tune is for them to run lean (and hot). limiter trim and tune will help (maybe a muff mod?) i bet there are quite a few guys on here that will tell you youre crazy if you run anything less than 32:1 for production felling type work. my guess if youre having similar problems with a bunch of saws, there must be something in the fuel/oil/tune/operation that they arent liking. my (nearly worthless) $.02

On ope and arboristsite I imagine the going rate will be 15:1 by 2018

 

[Ron660]

On ope and arboristsite I imagine the going rate will be 15:1 by 2018

In the last 3 years I've went from 50:1, 40:1, 32:1, now I'm at 24:1. I'll probably stop at 16:1.

 

[jed1124]

does not come back to an idle very quickly after falling tree

This sounds like an air leak. Maybe a leaky crank seal?

 

[Windthrown]

Sounds like my 441 strato saw was. Cold blooded, hard to tune (even with the limiters trimmed) and tended to run lean. No bar oil leaks though. I sold it. Wish I had kept my 372 74cc now, but I sold it and all my other Husky saws with my Bandit chipper a few years back. I run 40:1 oil and see no need to burn more than that. JASO FD, which is what Husky XP is rated at. 100 octane will not help. Use mid grade or super E0 gas though.

The 372xp X-torq has a lot more vibration than the original 372/371 as well. That has kept me away from wanting one of them.

 

[Locust Cutter]

Dang, I'm glad I have an OE 372xp...

 

[tree monkey]

pressure and vacuum test
tank vent
fuel filter
fuel hose
carb kit
spark plug (brand)
fuel

basic thing to check

 

[Cutmaster]

All of these EPA II Saws say recommended Mixing Ratio is 50:1 / As I stated above I even went to 40:1 and didn't change anything.
We can't run pump gas up here as there is only 1 gas station & the tanks get filled maybe twice a year at best, we don't even run that crap in any cars, trucks or lawnmowers thus the only reason we run 100 octane non ethanol fuel mix.
I have always ran 40:1 in my big saws ( 394's are 1998's & 395's are 2001's and 2003's ) because with a 36" bar on them they are in the cut 4 or so times longer than these with 20" bars.
All saws have dual ports / muffler mods & that always helps.
Decompression valve never gets touched when hot. No Leaks.
I'm going to try a carb swap with an unlimited coil.
If that doesn't fix them I'm selling them all & will rebuild the 371's, 372's and 2171's using Tanks & Cases from HLSupply.
I will still keep buying the 372xpw cylinder kits # 544 25 43-02 however, that's why I love these saws so much,
great power to weight ratio.
A Husqvarna 390 is still a Husqvarna 390? Awesome!
Going to call the dealer in the morning and order some!
Thanks!!

 

[Locust Cutter]

The 390xp is a damn fine saw.

 

[tree monkey]

change the whole top ends to the old style saws. bottom end and tanks are all the same

 

[tree monkey]

put the older cylinder's, piston, boots, carbs. filter base, filter on the newer saws