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Hi i have a mac 335 chainsaw that starts after you purge it but cuts out when you try to increase the revs its almost like its emptying the fuel bowl any ideas please thanks

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SOURCE: mercedes c 180 engine fault

sounds like a faulty airflow mass meter

Posted on Jan 13, 2009

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SOURCE: my 345 chainsaw bogs down when it hits wood

There are two idle screws one high, and one low. Your high adjustment idle screw needs to be adjusted.

Posted on Jan 19, 2009

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SOURCE: Chainsaw won't start

Try getting a new fuel filter. I sounds like its not getting fuel.
Also make sure that you are getting spark.

Posted on May 05, 2009

junmag
  • 175 Answers

SOURCE: car starts then cuts out

what engine is installed on your car? my initial impression is the ignition igniter module.

Posted on Jun 06, 2009

dontbother10
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SOURCE: MAC 335 Chainsaw has no spark

Like this.
Ignition Coil Test by SmallEng.com
http://www.youtube.com/watch?v=L7WNBDRG4C4
You may need to use a jumper wire between the threaded part of the plug and the cooling fins. You do not have to bend up the electrode. HTH
Lou

Posted on Jan 27, 2010

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Saw starts runs good then when i start cutting it


Hi Jason:
Make and model might help but here's two ideas:
1) Remove muffler and clean it. They can get plugged up with carbon and the saw will run at low RPM but will quit because of excess back pressure when you try to rev it up.
2) Set the high and low speed carb settings. Start the saw then gradually increase engine speed until full throttle. Screw the hi-speed needle in slowly. If RPM immediately drops, back it out until Rpm increases, then starts to drop. Screw back in until peak rpm reached, then starts to drop. Back out to peak, then 1/3 turn more.
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I have a 20 HP Honda outboard. It starts easily; but any attempt to increase speed either in or out of gear results in immediate cut off of the engine. On starting, it will idle normally for about three...


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1 Answer

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Adjusting carbs on chainsaws is not to be taken on lightly, there will normally be three screws, an L screw, an H screw, and an idle scre, the L screw will increase the fuel mixture from idle to half throttle ( they are fuel screws not air screws ) the H screw will adjust from half throttle to maximum revs, start with a base setting of between one turn and one and a half turns out, start the saw and warm through, allow it to idle, if need be increase the idle screw to get an idle, turn the L screw in slowley, the revs will increase as the mixture leans off, it will reach a point where it starts to die, now back it off a quarter of a turn, blip the throttle, the saw should pick up clean, if it has a flat spot increase the L screw slightley, now set the idle so it idles without the chain moving on the bar, now screw the H screw in to get full revs, be aware this should be set with an engine rev counter, do not exceed the manufacturersmax revs, hobby saws normally run at about 12500 rpm with an idle speed of 3000 rpm.

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1 Answer

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Start with basic stuff first, drain the fuel tank and re fill with clean fuel oil mix, press the purge bulb ten or so times to pull the fresh fuel into the carb, now try again, if no better remove the spark plug and check for a spark ( make sure the ignition switch is on ) no spark try a new plug, still no spark check for wires shorting out, if ok replace the ignition unit, if it has a good spark is the plug getting wet with fuel, if not it may have a blockage in the carb, this will require a carb re build, if the plug is wet remove the muffler and check the condition of the piston through the exhaust port, any damage here and the saw will require a re build and possible new cylinder and or piston.

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1 Answer

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Start with a 40-1 mixture this should not hurt engine for a long time if you are just a casual user. The oil in the chain reservoir is chainsaw bar oil and I usually top off each time I refill the fuel. To start Turn on switch, close choke, hold throttle to open position, You may need to place saw on the ground hold down with foot in the handle while pulling cord. Once it tries to start place choke in mid position and try to start again. Once it is running place choke in full open position.

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