roelex14
ArboristSite Lurker
The deed is doneYou just had to pull the muffler to look.
038av Mag getting very hot
- Thread starter roelex14
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How can you be so sure it is overheating? Are all the plastic covers on? Is the fan missing fins? Tach it out to about 13 k with the H jet .The deed is done
roelex14
ArboristSite Lurker
This is the factory plastic. I've put aftermarket plastic on it. I doubt this is the norm... Fan has all fins in tact
That near the muffler or cylinder where it melted?
roelex14
ArboristSite Lurker
Over the muffler
M
MattG
Guest
Might be irrelevant but is the piston and cylinder standard stihl?
Also if it's apart, PLEASE take several piccies of the piston and the inside of the cylinder and post them. With them I'm sure Lone Wolf (or even me!) will very quickly be able to tell you if there are signs of overheating damage.
Also if it's apart, PLEASE take several piccies of the piston and the inside of the cylinder and post them. With them I'm sure Lone Wolf (or even me!) will very quickly be able to tell you if there are signs of overheating damage.
M
MattG
Guest
That's just a cutaway in order for the plug socket to access the plug.
I couldnt help but notice the saw looks real bare at the airfilter end when you were cutting. Have you actually got a filter - I could just see the filter base? You really want some filtration - all that dust, and a hungry engine!
Furthermore changing the filter arrangement will require subtle H screw adjustments - a 2-stroke is very sensitive to slight airflow changes.
Also is it possible that the plastic was fitted badly and that's why it burnt? And that's why it feels like it's overheating? A two stroke engine will run very hot, it (obviously) fires once every 2 to 4 strokes. I remember all my motorbikes - just how hot the fins would get!
If we can't see any heat damage in the engine, and it's tuned ok, and if it still idles real nice after a bit of cutting then it's probably alright. But please sort the filter out.
Well that might explain it. Mufflers get hot enough to melt plastic if close. I would just tune it to like 13K with a tach and if it shows no signs of vac leak and the plug is tan you will be OK.
That tang in the inlet port is there to help keep the rings where they should be!....Do not remove it!!
Are you running the correct spark plug?
Try this.....Check that the plug is correct, check that your muffler isn't blocked, or better yet, gut the muffler and try running a tank of 32:1 through it, tuned so the saw IS four stroking out of the cut.
M
MattG
Guest
Back end of this manual (page 37)
http://www.stihlusa.com/WebContent/CMSFileLibrary/instructionmanuals/038_Manual.pdf
reckons it's 12,500 RPM.
Not sure if it's the exact same model as the dudes, though.
That's a common sight on an 038 that's been run hard. If you replace the plastics, put a layer of thermal foil on the underside. Another layer over the oil tank is also a good idea.
O
O
No that is for the 038 his is a Magnum.Back end of this manual (page 37)
http://www.stihlusa.com/WebContent/CMSFileLibrary/instructionmanuals/038_Manual.pdf
reckons it's 12,500 RPM.
Not sure if it's the exact same model as the dudes, though.
roelex14
ArboristSite Lurker
Ok so I've now replaced the spark plug, mixed the fuel 32:1 with 92 oct gas, ordered a new muffler and exhaust gasket, lined the inside of the new plastic with foil tape (will also be doing above oil tank as recommended). Ive tuned the carb as well as i can by ear, but as soon as I get my hands on a tachometer I will be tuning the high side to 13500rpm.
Ozhoo may be right and this just may be due to the age and past use of the saw... I really appreciate all the help so far guys!
Ozhoo may be right and this just may be due to the age and past use of the saw... I really appreciate all the help so far guys!
Tune it a tad lower. Why new muffler?
32 to one will make it run leaner. more oil = less gas! Try 40 to 1
M
MattG
Guest
M
MattG
Guest
Why don't you post piccies of current piston and cylinder then someone will be able to tell if it really was dangerously overheating?
