pressure checking a Husky 372 xp.

I have been working on this 372xp and it acts like it has a bad air leak.
I want to pressure check the crankcase and I can block the exhaust and impulse easy enough, but the intake is a little bit different on this saw.
So, what do you guys use to block off the intake on these saws.

 

If t’s an XP ( non XTorque ) , a piece , or two of gorilla tape on the carb mating surface ,punch a couple of holes through the tape with a hot scribe for the mount studs .
If it’s an Xtorque …….. no idea . Never P&V’d one .

 

I use rubber from a piece of old inner tube from the motorcycle shop. I just cut to whatever shape is needed.

 

It is an X-Torq.

 

You cannot do that with this intake. It has a piece that protrudes out of the center of the intake.

But I think I have an idea that I am going to use after thinking about it for a while.

Keep the ideas coming you never know.

 

I’ll look for a pic
I did it on a Jonesered XT with a plug and a socket using the carb bridge and bolts

 

That is what I am going to use. I have a socket that I modified a little that will fit and block off plate for the end of the socket with a piece of rubber. I will use the carb screws.
To get pressure into the crankcase I will use an old spark plug I modified years ago.
Thanks M2theB

 

couldnt find the pic, but you got the idea.
Pic is here on the Bench thread, or OPE or both.

 

found it

 

Yep thanks for the pic. That basically the same thing I have going on except I have a steel block off plate on the end.

 

Have your limiter caps “fallen out” yet? The XT is very picky on carb tuning, mine acted the same way until I got it tuned correctly. Spike 60 I think is the fella here who had a great tutorial how to adjust the low jet correctly.

 

I swore up and down it was an air leak, sprayed everywhere a leak could occur with carb cleaner running, yet nothing. Stumbled upon the way to tune the low jet, and no more issues.

 

On these saws-

Check the throttle cable.
Check the bearings and pto seal area.
The carbs can be finicky but shouldn’t race.
I do the spray tests on any that have running issues. I have pressure/vacuum tested one Xtorq and had to fab something up to get a seal.

 

i had a surge issue at idle for this XT.
Had to fatten it up to drive it out.
Not sure I have cared at the expense of a good transfer to high

 

Well, I am not ruling out the carburetor, but it is brand new. I need to do a pressure check on it. I do not want to be guessing at this point and need to start eliminating things I know for sure are either good or bad.

Someone has worked on this saw before me, and they replaced the crank seals the carburetor and the intake boot. It has new fuel lines and filter and a new plug in it.
But I do not think they ever did a pressure check on the saw. So, I have already tried tuning the carb with no luck and I do know how to tune a saw I have done plenty of them, but I have never had a need to pressure check a 372 xp and instead of trying to invent the wheel I thought I would see what you guys who done a 372 xp have used.

So, when I go back into town on Monday, I will check this saw and keep you all updated. It will be interesting to see what I have found.
I did check the cylinder bolts also. I already tore the carb apart to make sure no gaskets were in wrong. The guy who worked on this before me was a real dummy. I have ten items at a small family business that need to be looked at that have been worked on but not fixed.

 

No problems with limiter caps it is a brand-new carb.

 

The throttle cable is something I did not examine real close. I will check that.

 

Then you indeed have a problem, meaning the limiter caps are still there. You cannot fatten up the low jet enough without a dealer screw driver to tune it without removing them. There is a super fine line of lean to too rich, the jist of it is you tune it as close as you can. Leave it idle and then tip it forward bar down at a 45 if it revs up, it’s too rich just lean it out a 16th of a turn in til it stops reving up.

 

I do have a tool for adjusting the carb or as you put it the dealer screw driver.
Getting it to idle at a low rpm is part of the issue. If the idle goes up when you tip it up after sitting, then it sounds like pooling of fuel from being too rich.

 

Well, I went into town today with my socket in hand and did the pressure check on the 372xp. I tried pumping it up with my hand pump and it would not even come close to building up any kind of pressure. So, I hooked up a compressor and would blow in small amounts of air quickly.
Finally found the base gasket for the cylinder on the clutch side right below the transfer port blowing air out like crazy. I am surprised this thing even ran.
A new gasket is on order, and I will go back in on Thursday and replace the gasket and maybe add a little Yamabond while I am at it.
Then perform another pressure check to make sure everything else is ok.

I also found the screws that hold the oiler in place go right into the crankcase because I could see air coming from there too. So I may put some sealer on those screws too when I put them back in.
I checked the cylinder bolts, and they were all tight so I never would have guessed it was leaking air from the base gasket unless someone before me screwed around with it.