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What causes engine to knock when I try to start craftsman chainsaw 40cc

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If there is low engine oil or no oil at all

Posted on Oct 18, 2013

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  • robt Oct 19, 2013

    The had/oil is mixed right. There's oil in the crankcase. The cylinder walls are not scoured sand piston and rings are fine. I'm thinking something is loose near pull cord mechinism???

  • robt Oct 19, 2013

    That wa see not helpful at all!

  • robt Oct 19, 2013

    Has good compression


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Posted on Jan 02, 2017

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SOURCE: chainsaw wont start. new plug has a little spark.

The engine case needs to be removed to expose the flywheel and ignition module. Check the module pole gap to the flywheel magnets with a thin business card for a gauge. If the gap is excessive, that can give a weak spark. If the gap appears to be correct, then it is probably time for a new ignition module. Make sure the spark plug is gapped at 0.020" before condemning the module. The spark should be blue and snappy. Check it in a dark area. Hope this helps!

Posted on Apr 17, 2010

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1 Answer

Why is the starter handle hard to pull?

Sounds like it could be seized. Have you been running it on the correct fuel and oil mix? Clutches are centrifugal, so only work when the saw is running, so it wouldn't effect the starting. You would have to have the chain brake on and for the clutch springs to have gone in order for that to effect the saw starting.

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Poulan 40cc 18". Not starting. Muffler full of liquid (gas?). Very hard to pull with plug installed, easy with it removed. New plug, good spark.

You might have a hydraulic lock in the engine if you squirted too much fuel in the engine while trying to start it. take the plug out, hold the throttle wide open and pull starter rope 5-6 times to clear it. Put plug back in and try to start it.

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What is the spark gap for 221 pro 40cc

The gap for all Poulan chainsaws, regardless of the spark plug used, is .025.

Jun 12, 2014 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

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45 lbs. of compression...........good or bad?

If it is still under warrenty then return it for a new one...
Compression should be around 90-110 lb. per sq inch.
Sounds like ring problems, valves, etc.
If it is not under warrenty, time to trash it...because the engine is shot.
Please take time to rate me

Oct 26, 2012 | Craftsman 18" 2.4 C.i. 40cc Chainsaw...

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Have The split cylinders in the Ryobi RY10532 40cc chainsaws caused grinding problems?

check chain sprocket take a rag over chain and pull it around should be smooth rolling also check nose of bar there are rollers check them out lota sawdust can build up behind clutch/sprocket

Apr 08, 2010 | Ryobi Factory Reconditioned 18" 40cc...

1 Answer

My ryobi 40cc chainsaw wont start, spark at plug and sounds like it wants to go but there is no compression. any advice as to what im doing wrong

'No compression' usually means serious mechanical problems with the piston/rings, but if this unit has a compression release, then it may be 'set' which reduces compression considerably until the engine fires. Try putting some fuel mix into the cylinder head spark plug hole and reinstall the plug. If it runs for a few seconds, then look into the fuel delivery system (did the compression increase?). Check that the carburetor is bolted tightly to the engine and the fuel lines are intact. Make sure the choke will close all the way and the throttle opens all the way. Make sure that the primer bulb fills with fuel after several pumps. Assuming that the engine ran properly for the people that 'reconditioned' the saw, this unit should not be giving you problems like this.

Dec 29, 2009 | Ryobi Factory Reconditioned 18" 40cc...

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