This old Stihl MS170 chainsaw has many problems but the main complaint is it bogs under load. It's never seen any service, and this video shows several tests and procedures to get it back up and running again. The same principles apply to most any two-stroke lawn and garden gear made by the likes of Husqvarna, Echo, Red Max, Shindaiwa, Craftsman, Ryobi, Poulan, and many others.

Watch this video next:    • DIY Pressure Tester for 2 stroke smal...  

Mitivac MV8500 Vacuum Pressure Test Kit: https://amzn.to/3P362PI
Stens Maintenance Kit No. 605-122 https://amzn.to/3T2MBId
RB-77 Carburetor re-build kit https://amzn.to/49ZeZSl
NGK BPMR7A Spark plug https://amzn.to/4c1FpVp
Stens fuel filter No. 610-156 https://amzn.to/3IjmgQT
Stens air filter No. 605-325 https://amzn.to/432u2bp

The tools I like and use most often:
Magnetic spark plug socket set: https://amzn.to/3CzmpvO
Tachometer: https://amzn.to/3sHibiH
Vessel Megadora JIS screwdriver set: https://amzn.to/363RFqO
Channellock Bent Needle-nose pliers: https://amzn.to/3I5DbnA
Long 1/4 Quick-connect Torx Driver Bits: https://amzn.to/3HUNgnm
Spark Tester: https://amzn.to/3CxW2qi
OTC Leak-down Test Kit: https://amzn.to/3CyUhJn
Compression Tester: https://amzn.to/3IWd6sp

Any links to products are likely affiliate links, and I may earn a small commission from qualifying purchases (Thank You!), with no additional costs to you.

00:00 I'm not Tom
00:55 Overview of problems
02:20 Remove and clean muffler
04:24 Clean spark arrester screen
05:20 Compression check and piston check
06:22 Remove carburetor and linkage
09:29 Remove and replace fuel filter
11:09 Disassemble carburetor
15:46 Replace fuel inlet screen
16:13 Replace fuel pump
16:36 Replace needle
18:23 Replace metering diaphragm
19:28 Pressure and vacuum test crank seals
23:15 Replace carburetor and linkages
25:39 No joy in Mudville

Wear your safety glasses, or you'll shoot your eye out. Try on some gloves. Take off that spark plug boot. Clean your room. Open the windows, those fumes are nasty. Just 'cause I do it, don't think it's the end all, be all solution. There's plenty more ideas out there, I can't take responsibility if you slice off a few fingers after watching my videos. And don't just pour that toxic stuff down the sewer or in the ditch, dispose of waste responsibly. Just be safe, OK?

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  / thelawnmowerlady  
https://the-lawnmower-lady.blogspot.com/

Titles, opening graphics, and music by AbleVFX.

Disclaimer: The content of this video is purely for my entertainment, and is available to you for informational and educational purposes only. It's not substitute advice from small engine mechanics with professional training and certifications, nor does it create any kind of relationship between the The Lawnmower Lady and you. Your situation may be different, and the The Lawnmower Lady makes no warranties, express or implied, as to the fit, accuracy, or applicability of the information shown in this video, and implies no guarantee of results. The Lawnmower Lady and any sponsors of this video are not liable for any damages of personal injury, property damage or loss of any kind that may result from the use or reliance on this video and/or any parts and procedures represented in this video. You are using the information presented in this video solely at your own risk.

#stihlms170 #chainsaw #lawnmower #smallenginerepair #DIY