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#Post#: 89159--------------------------------------------------
Stihl 362 cuts out & can't make full revs
By: schreib Date: April 26, 2022, 7:12 pm
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Having some odd and inconsistent runability problems with my
362. It idles just dandy. Wondering:
-- Should I rebuild the carb or replace the plug?!`
When I start it, it takes a few minutes to warm up enough before
I feel it is consistent enough(not cutting out, able to make
higher revs) to start cutting a tree. Often it will run fine
for a while but more often than not it seems just not able to
hit full revs, bogs down while just making a standard cut in a
12" tree, and occasionally runs up to higher revs on a road of
up and down cycling that makes you feel like there is something
stuck in the high speed carb jet feed-- like a spec of dirt is
plugging and unplugging it??
An odd thing happened a week ago: I started cutting the front
wedge, horizontal felling cut, and it totalling bogged down but
would cut, more or less normally, in a standard vertical cut on
a log. Still would not hit full revs.
Today:
-- pulled off air filters and air hosed them down -- pretty
dirty, but restarted the engine with no filters and it bogged
down the same. . . continued. . .
-- pulled the plug: pretty wet, even the ceramic and tip(see
image)
-- re-installed tight and the engine ran up to quite high Revs,
it seemed as if I had fixed the problem by pulling the plug and
re-installing??! NO, CAN'T BE. So,
-- pulled the plug again and although the threads were wet the
tip and ceramic were nice and dry, brown to tan color(images)
Later on today: started it cold and this time revved it high,
but on the way up, lots of quick hesitation-- still, idles
great.
My guesses:
-- carb rebuild to clear out passages in high speed
circuit(bogging and hesitation).
-- engine getting old, maybe not so great compression, check
that. How much is reasonable for a 10 year old?
-- new plug? (hesitation), it is not that old 3 years or so?
YOUR guesses here==>
#Post#: 89270--------------------------------------------------
Re: Stihl 362 cuts out & can't make full revs
By: Chainsawrepair Date: June 7, 2022, 2:37 pm
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Ever figure out? Mtronic or regular carb?
You pressure test etc for air leak?
M-tronic maybe just a faulty solenoid
HTML https://blog.stihl.co.uk/change-solenoid-valve-machine/
#Post#: 89273--------------------------------------------------
Re: Stihl 362 cuts out & can't make full revs
By: pleasant Date: June 9, 2022, 3:20 am
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Get it started on idle as best you can. Then remove the starter
recoil to expose the flywheel (be careful- the flywheel will be
rotating) Grap a can of carb spray or similar and hold up a bit
of cardboard or similar against the air filter housing to
prevent any spray from the can going near the air filter. Then
while the engine is still running, spray some of the carb spray
around the flywheel area- if you have an air leak through the
crank seals, then the revs should increase almost immediately
and then die back down. Do it two or three times to be sure.
Like i say- make sure you don't get any near the carb/filter
area as that will give you a flase reading. Another tell tale
sign even before you do the spray trick will be a lot of oily
residue inside the recoil housing around the flywheel area- this
being caused by the fuel/oil vapour escaping from the crank
seal. Hope that helps, as doing a complete leak down test is
quite labour intensive and you will need special tools to
conduct it- this method at least confirms the problem.
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