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Stihl mm55 schematics

Have a yard boss multi cultavator start fine lots of power but a high pitch noise is coming from unit. Sat all winter ran if for a while seems to me better. Just wondering if I might have a bad bearing some where.

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Hi.. your starter one way drive spindle needs to be lubed....all the older briggs and stratton engines eventually have that problem...remove your starter cowling and you will see a metal square shaped part bolted to the engine which holds the flywheel onto the engine crack. that metal square drive spindle will rotate freely one way but won spin the other way...thats your starter one way drive...inside are about x6-8 roller bearing that lock it one way, so spinning it will start you engine, once the engine has started and is running the internal bearings will disengage due to centrifugal spinning forces, and you starter rope wont be ripped to shredds...its like a one way drive system...this part is supported on the cranck shaft thats spinning @ around very tight clearance on the inside...
a quick fix is to use WD40 or CRC with the extended long tube nozzle fitted to your can of lube. you will need to spray the lube at the end of your one way drive spindle...there is a small hole ,its there to be used as a oiling point....the squealing high pitch noise will be gone... wear eye protection when your spraying lube into small places....while your there spray some oil into your starter aswell....your couling should then be refitted using you 7/16 th spanner...i think there should only be x3 bolts holding the starter cowling way need to lube it again next winter.....(dont disassemble the rotating drive spindle, the 6-8 bearings will fall out and reassembly is a pain....)

Posted on May 28, 2014


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SOURCE: I have a stihl 021 that doesn't want to idle, and

This is a timing problem.
Check the plug, and check magnete.
Then if you have to, remove the carb and replace the inlet gasket.
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Posted on Jul 26, 2009

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SOURCE: I have a Stihl .029

I have owned and use Stihl saws for the past 18 years and I have seen both these problems many times. as for the chain 'getting tight' -- when you go to adjust the chain, make sure you are lifting up on the tip of the bar as you set the tightness -- you should be able to only pull the chain away from the bar about 1/8th of a inch. now, while tightening the bar bolts make sure you still are pulling up on the tip of the bar,, and make sure the bar bolts are nice and tight -- not to tight though, the bolts that Stihl uses are a very weak point on their saws and I have broke more than just one. but make sure after one is tight that you tighten the other one and then give the first nut one more 'little' nudge tighter. new chains do have a break in period and they have been known to tighten up and loosen as they are running,, just keep your eye on it for awhile and thighten or loosen as needed.
now I am kinda confused on your next problem -- you say ' winter mix bar oil ' -- using this oil should not have anything to do with it stalling out, ( enless you are mixing bar oil with your gas ?? ),, make sure you are using Stihl 2-stroke oil to mix with your gas at a ratio of 50:1,, ( you can buy small bottles that mix with 1 gallon or a bottle that will mix with 5 gallons -- use 'em ). one thing that I have had troubles with when my saw wants to stall out is the fuel filter inside the fuel tank in the wrong position and is sucking air. also I have had fuel lines that crack and/or split and they **** air.
now the winter bar oil -- please,, I have been running Stihl saws in temperatures ranging from minus -5 to 100 degrees above and I have always used the SAME bar oil year round and had NO problems. on the side of the saw there is a bar oil delivery speed screw and you can adjust it to flow more or less -- your manual should show you the exact location of this screw,, make sure you clean out any debris that might be blocking the weep hole for the oil delivery. you need to make this adjustment with the bar and chain off the saw and you will see the flow of the oil and you can adjust to a good flow.
I am a firm believer in buying and using Sthil chainsaws,, I will never buy anything else,, they are great and out last any other saw I have used or seen,, and your Farm Boss is a great saw and should give you many years of trouble free use.
one suggestion that I would make real quick is to ' change your saw mechanic ' -- find one that has been ' WORKING ' on chainsaws ( not just selling them ) for along time,, someone that has your interest at heart and is there to help you,, not just to take your money.
(((( I am still laughing at the ' Stihl Winter Mix bar oil :-) )))).
good luck with your saw,, and if you have anymore questions about this please feel free to write me back here and I will do my best to walk you through what it is that you need to know and do. again - I have been using and working on chainsaws for most of my life.
have a great night,


Posted on Feb 10, 2011

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