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Old 11-26-2009, 07:01 PM   post #1 of 7
Bearcamp
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Default Stilh 038 chainsaw carb adjustment

What should the hi and lo speed adjusting screws be adjusted at on an 038 Stihl saw?
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Old 11-27-2009, 01:11 PM   post #2 of 7
Ironmower
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Default Re: Stilh 038 chainsaw carb adjustment

Should be close to 1 full turn out. This is only "ball park". Is the saw running now? Every saw "tunes" alittle different.
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Old 11-27-2009, 02:53 PM   post #3 of 7
Bearcamp
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Default Re: Stilh 038 chainsaw carb adjustment

It's running now but the screws are about 2-3 turns out. Won't idle and hesitates. I tried them ay 1 1/2 turn on both and no good.
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Old 11-28-2009, 05:29 AM   post #4 of 7
Ironmower
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Default Re: Stilh 038 chainsaw carb adjustment

Sounds like it may have a vacuum leak. Can you explain more about it; like is the saw new to you? did it run before? Ect.
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Old 11-28-2009, 06:49 AM   post #5 of 7
DSL DOC
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Free Re: Stilh 038 chainsaw carb adjustment

as a factory trained stihl tech as we have the tools as most individuals dont we would test for like he said vacumn leaks first most of the time we are seeing the crank seals wont hold psi and will hold vacumn and vice vers or the boot to the cyl or the plastic plate between carb and cyl is cracked now as an individual in my driveway i would pull the carb and get a kit from a stihl dealer or most any farm supply place that services small engines it should have a zama or walbro most likely a walbro ull need your numbers off it one more trick people dont do because of no tools is u need to remove the sealed little buttons and clean those passages and reinstall a small chisel gently should remove and a small punch hit once or hit to seat new ones any more than that and you will distort the button and no seal then we use nail polish on the outside of the buttons

just a note they were 026 038 etc now the are 260 361 etc i will always look for a 0 series and built like an OLD GRAVELY WITH CAHONEYS
the 0 series saws have bigger needle bearings and roller bearings on the wrist pins and cranks as well as metal bar retainers etc as apposed to the newer stihl stuff going smaller and lighter esp the plastics my fav stihl of all times is my 026 pro i rebuilt the whole thing at work and run a full chisel chain it is an eating mother i would start out at 1 1 1/4 each turn and go from there after a rebuild if you are 2-3 turns out now 90 percent chance youre getting in the carb trust me we prob rebuild hundreds a year if you have a rpm gauge you can get 13000-15000 out of my 026 pro but if you go to lean will lose your power under load so no load rpm is not what you want to achieve its loaded rpm with out hitting the governor causing a miss and back your screws out till it starts to miss then turn back in till smooths out go from there also remmber clean you exhaust screen and you can look at cyl and piston when pull exhaust off

hope i could help

like i said before gents if anyone needs help with something im not all that but very capable ive been wrenching pro for 15-20 years stihl kohler briggs toyota and even spent 5 yrs runnin the racks on detroits

hence the name

DSL DOC
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Old 12-09-2009, 02:27 PM   post #6 of 7
Bearcamp
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Default Re: Stilh 038 chainsaw carb adjustment

Wow, now that's some info. Just found out that I have a weak spark. This is the electronic ign, no points. I can grap the plug wire, pull the cord and barely feel it.
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Old 12-09-2009, 05:41 PM   post #7 of 7
rscurtis
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Default Re: Stilh 038 chainsaw carb adjustment

To verify that, reduce the plug gap to about .010 and see if the saw runs any better. If it does, that may be the problem.
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