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I just baught an old pro mac 850 in good shape last year. i cut 4 loads with it but i could never get it to idle or wind out like it should. where should i start my tunning. this saw has been modified for ''hot saw'' competition.

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Need to check the boot between the tank an the carb if its slightly cracked or the bolts r out it wont tune right ,, the boot will detereate after a while

Posted on Mar 28, 2009

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Starts, idles and runs but quits after a few seconds of cutting


Check the air cleaner and muffler for plugging. One screw adjusts the idle stop (idle speed) position and the H and L jet screws set fuel mixture for high speed and idle speed mixture respectively. Turn both jet screws CW to stops (lightly) then back each out CCW 1-1/2 turns. This is a basic setting and should allow the engine to start and run. Start the engine and allow to warm up. Pull the throttle full on and adjust H CW until the engine starts to speed up, but 4-strokes. Correct adjustment is when the engine 4--strokes running free, but immediately 2-strokes when cutting. Release the throttle and adjust L needle CW until the engine idles fairly well, but allows the engine to 'follow the throttle'. Adjust the idle speed screw so that the chain stops turning, but the engine will continue to run. Hope this helps!

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I own a McCullogh 610 Pro mac chain saw. Why does


Check the muffler to make sure that the spark arrestor screen is not plugged. Make sure the air cleaner is clean and not plugged. Turn both L and H mixture screws CW to stops (lightly), then back out 1-1/2 turns each. Warm up the engine, then open the throttle and turn the H needle CW until the engine speeds up, but still '4-stroking' but should immediately start '2-stroking' with light cutting. Release the throttle and adjust the L needle CW for fairly smooth idle, yet rich enough to allow the engine to 'follow the throttle' immediately when accelerated. Adjust idle speed CW until the chain starts to turn, then back off until it quits turning. Make sure the chain is being properly oiled and is adjusted for no chain droop, yet turns freely by hand. Hope this helps!

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1 Answer

What would be the recommended gas/oil mix for a mcculloch pro mac 610 chainsaw


40:1 (3.2 oz/1 gal) per the manufacturer.
http://www.acresinternet.com/cscc.nsf/ed1d619968136da688256af40002b8f7/564ff25e56449e8c88256c2f001cd723?OpenDocument
I'd use 50:1
Fuel/Oil Mixture
  1. Use a quality 2 cycle oil and mix it to the OIL supplier's recommended ratio. Today I use Stihl 2 cycle oil mixed @ 50:1 in a Pioneer that I purchased new in 1980. There are no gouges or scratches on the piston or cylinder and I have no carbon build up on the piston top. The manual (on stone tablets) recommends 24:1. Over the years the mixture has leaned from 24:1 (Saw Recommendation) to 28:1 (Lawn boy mower recommendation) to 32:1 (Oil provider 8oz/2gal - used for many years) and finally the last 5 (±) years 50:1 (Stihl 2.6oz/1gal)
  2. Any fuel containing ethanol is not good with chainsaws. Mix what you expect to use within a few months. Anything over 1.5 months old use up in a 4 cycle engine. HTH
Lou

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1 Answer

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Try turning the high idle screw out 1/8 to 1/4 turn refer to your manuel for the location of this screw.

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I used to think it was 3- Half turns. But just now discovered on a Poulin Pro, about 1-year old, this was to much. Flooded. Went with, screwing all the way in, and then backing both H and L out just 1-full turn (2-Halves). Perfect. From older models of 2-stroke motors, if, when you pull trigger, there is a lag in acceleration, then open the L little more, till lag is gone. Then at wide open, turn H in little till motor is at it highest RPM (or out, which ever makes it fastest), then back out the H about 1/4 turn. You are finding its most lean point (highest RPM) but, you want to run it slightly rich for most horse power when motor loaded i.e. cutting.

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