Help with 372XP

[TJACK]

In case you think you are seeing double, I posted this same question on another forum in an attempt to get some help.

I need someone to refer me to someone who you consider to be the absolute very best at trouble shooting problems with saws.  I have had my 372XP to 3 dealers / saw shops in the last 4 years and it is still not fixed.  The saw shops who have worked on this all deal mainly with the professional market (loggers) so they have vast experience.  One of the shops even builds modded work saws.  Each one agrees there is a problem although none has been able to fix it.

The problem, the saw lays over and the pitch of the saw (RPMS) changes.  Believe or not, you can really here it when you are wearing muffs.  Maybe because it has a modded muffler.  My 357XP will out cut the 372.  I could just trade it in, but the saw has less than 25 tanks on it and I wouldn't like it if someone tried to sell it to me. 

Things that have been done:

Besides the many carb adjustments, new carb, new ignition, new bottom end crank and bearings, new plug what else is left?

Just tell me were to send it, I am fed up!!!

Jim

[ladylake]

Jim  Mt o44 Stihl did the same thing, the boot between the carb and cylinder was cracked. When tipped sideways it would open the crack a little letting more air in and increaced the rpm's.  Could also be crankshaft seals or a cracked fuel line or loose clamps on the carb boot.  Steve

[ladylake]

Jim  One more thing, on my 044 getting that carb boot on right is not very easy.  Don't know about a 372.  Steve

[sawguy21]

Did anyone vacuum or pressure test it? Sounds like a bearing/sealproblem.

[parrisw]

Ya sounds like you have a air leak, you say you have a modded muffler, is anything else modded.  Some places remove the gasket at the bottom of the cylinder, maybe you have a leak there.  I would say double check everything for a good seal.  I know of a real good saw shop, but might be far away from you and you would have to ship it there.  Although they do ship all around the world for their modded saws.  Its Walkers shaw shop on Vancouver Island in Canada.

Will

[TJACK]

Can someone explain how to perform a vac and pressure test and what results should be expected?  Or should I just send it away?  The only thing modified is the exhaust is opened slightly.  I will look at the boot, although given all the problems with the early 385XP's I would have thought the saw shop would have checked this. 

Any other thoughts?

Thanks,

Jim

[Kcwoodbutcher]

What were the problems with the early 385xp's?

[Kevin]

Your local saw shops should be equipped to do a pressure test.

[TJACK]

I will call the saw shop on Wednesday to see if they can do a pressure vac test. 

KCwoodbutcher,

The problems with the early 385 xp involved cracked carb boots.  This was corrected on Husky's part and the replacement was easy.

[Bill]

Jim

Don't know whether this'll help or not since I mostly have auto background with some small engine thrown in. That said I agree with the pressure/vacuum leak talk ( since its mostly beyond me  ? ) but also think it could be a fuel supply problem. I have a leaf blower that's real particular about the angle of the gas tank - seems just the right angle and the fuel filter/gas pickup doesn't sit in the gas just so an she'll lack for fuel - lose rpm's. Doesn't quit - just wants more juice. So I'd also be looking at fuel filter/pickup for restrictions or position besides the rest already posted. Course iffen it happens with a full tank well  . . .  with only 25 tanks you'd hardly think the filter would give up that quick.

Good Luck . . .

[Kevin]

The position of the fuel filter inside the tank with relation to how much fuel is in the tank is a good point to consider.
If it goes lean with a partial tank of fuel then that could be the problem.

[rebocardo]

> what else is left?

On my saw, it was the compression release valve, after cleaning it up and the hole in the cyl. wall the saw runs brand new. Now, besides the valve working, it starts with one pull, and does not stall at the end of a cut.

[jacob j.]

The compression release is one good area to check, another is the bushing that the oil pump worm gear rides on. This bushing slides over the shoulder of the PTO side of the crank (clutch side) and the worm gear rides on this bushing. Occasionally the bushing will be just slightly deformed and when turned on its side it will start to suck air. The bushing is what the PTO side oil seal rides on also. If you got a new crank then that rules out an out-of-round crank, which is possible, especially in e-lux saws because they use the same size main bearings in both sides of the case halves.

Another thing to watch for in 362/365/371/372 saws is a distorted case gasket or distorted cylinder base gasket. Let's just say e-lux's quality control isn't the best. I've actually seen three 371/372's with folded cylinder base gaskets that leaked air when the saw was new off the assembly line. Sometimes the case gasket isn't installed correctly and will leak a small amount of air where it meets the base gasket.