I've got a MS170, great saw. This informative video shows to save the small engine shop labour repair cost by performing the maintenance yourself .  Never take it in for a carb kit.  It's cheaper to buy a brand new carb and slap it in.  

These saws need continuous cleaning, tooth sharpening, quality gas & oil (best is can premix, pump gas is okay), and functioning chain oil ports.  I'm not certain about the operation to maintenance time ratio, but something like 5-10 min. per hour of use to keep the saw in safe, good working order.

I disconnect the throttle rod (the choke rod is easy) by opening the handle moulding, disconnect that end first, then the throttle lever, taking care not to let the hook spring fly away.  I never change the inlet lever.  If pivots it's working.

The diaphragms and gaskets deteriorate and what the kit is great for.  

The main weakness with the 170 carbs, of different kinds depending on saw serial# when bought new, is the 1-way unserviceable fixed jet.  The little brass screw isn't the jet, it's the orifice extender intake.   You can poke a thin wire through that, clear any debris, but if the real jet below in the carb casing is blocked it's  buy a new carb time.  

The kit is great for the gaskets.  When the jet has clogged and packed it in you'll know even before a kit replacement. If after perfectly installing the kit parts,  and the saw doesn't fire up, the carb is shot, all because of an unserviceable jet.  The plus side is the carbs are relatively cheap and easy to replace.

Thank you for explaining about the metal tab on the left. Went through 5bvideos and your the only one who explained that.

You did a good job and you got positive results and you don’t need apologize.Been a mechanic for years and everyone is different…

Great video 👍 I've just been quoted $200 from a main dealer to supply and fit a new carburetor to my ms170. Watched your video and ordered a carburetor service kit for $10. The chainsaw is now running fine 🙂
Thank you 👍

Best video I have seen on these saws thanks

Took me an afternoon, but then, I am an 85 year old grandmother.  Works like a charm.  Thanks for the video

I was just googleing why my saw wouldn't start.. now I learned something and really enjoyed this video.. thanks bro

Nice job. That was extremely helpful. That tiny spring inside the carburetor was very tricky. I used the pointed end of a zip tie to hold the spring down so I could get the holding piece and screw in place. Then I slipped the zip tie out and tightened the screw.

Thank you sir you saved me at least 40 bucks.

Kyle you saved the day man! I brought mine for service and after diagnosis I was quoted at $160 (CDN) for a carb kit and install... so I bought the $20 carb kit and thought I can do this myself. Surprise, I was given my chainsaw back in parts with the carb disassembled in a bag! They said that they don’t include the reassembly for the $30 diagnosis fee. Anyway, I guess I won’t go back there for service! Let’s say that I was a bit discouraged but though ‘I can do this’ and I did THANKS TO YOU!!! It works like a charm, I saved $100 and learned something today. Cheers

I completed the project this morning. I was amazed by how easy it was - due to your excellent instruction. Thanks again!

I am a technical trainer for the healthcare industry who has little experience with small engines.....I just want to say...this is one of the best videos on how to fix small engines..Keep up the awesome work. Thank you.

Thank you so much

Many thanks from Victoria, Australia. I follow your instructions after my saw started playing up. Checked and cleaned filters, spark arrestor and fuel with no luck. Then followed along with your video and the saw is running like a dream. You saved me atleast $100 but also taught me a new skill. All the best to you mate.

Great video, I was able to follow the instructions exactly and resolve my issue.  Running great again!

Great video with very clear instructions.

Very detailed. Thanks for posting

Hey Kyle, I had the same problem with my MS170 earlier this year.  My father in law and I replaced the carb and got the saw running well again.  I actually found this video after we did the work.  It definitely would have helped to have seen this first as the throttle and choke linkage clips are somewhat of a pain in the neck to work with when you don't know the tricks.  It is good to know a cleaning could resolve this issue if it happens again, though.  Thanks for taking the time to make the video and share your knowledge!

Thanks from Australia for such an informative video and well presented video

Just got back from the workshop with a smile on my face.  Removed the carby and cleaned as you showed. Worked a treat thanks