Tip & How-To about Stihl Saws

Make your own engine 'piston-stop' tool

The use of a piece of recoil rope will not damage the piston, and if it gets stuck, reverse the rotation, remove rope, and try inserting it again.
1) Using a 12" piece of recoil rope, or similar size rope,
2) Remove the spark plug,
3) Feed about 6-8" of rope into the cylinder,
4) Rotate the flywheel in the direction of rotation that matches the removal of the flywheel nut or clutch
*note: all flywheel nuts are 'right-hand' or clock-wise to tighten threads
all drive clutches are 'left-hand' or counter clock wise to tighten threads

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How do you remove the flywheel to get at the coil on a ts350 stihl saw

The official way to remove it is an M10x1 'Knock-off-tool' right hand threads. A 2 or 3 jawed puller will not remove the flywheel, and guaranteed damage will occur. Flywheels and crankshafts have a tapered design, so when installed with a nut, the taper tightens as the nut is tightened.
OK, you probably do not have one of those on your work bench, so lets make one or something like it.
1) remove spark plug,
2) insert a 12" piece of recoil rope (use about 6 or 8 inches) into the plug hole.
3) rotate the flywheel counter clockwise until the rope has bunched itself into the top of the cylinder, stopping the piston before 'top-dead-center'
*note: this would act as a replacement for a 'piston stop'. The rope is soft, so no damage to piston or cylinder will occur. If the rope gets caught on a cylinder port, you can back up the rotation, pull the rope out, and retry inserting the rope.
4) After removing the original flywheel nut (right hand threads, so righty-tighty, lefty-loosy)
purchase two M10 nuts, thread them onto the crankshaft (but not against the flywheel) so that the end of the crankshaft is not above the last nut.
5) turn the saw over to position the flywheel up, with a medium weight ball-pean hammer, strike the top nut with a good sharp wrap.
**note: Do NOT hit at an angle, use a square, straight down strike. Do NOT strike the end of the crankshaft. 2 strikes should do it, grasp the flywheel to check to see if it has loosened.
6) When reinstalling the flywheel and nut, tighten with the same force as when removing. 20 ft.lb. is the official torgue.

Jan 29, 2017 | Stihl Garden

2 Answers

Replacing A ChainSaw Chain Drum/Sprocket

Ok, great advice. My sprocket is worn out and I ordered a replacement. It came, but the bearing is separate and a very tight fit. What is the best way to seat the bearing into the drum sprocket. Drive it in or should I first heat the drum to expand it? Wayne

Dec 06, 2009 | Garden

1 Answer

My poulan 2075c chain saw won't start. Pull recoil rope will not pull out smoothly.

I would suspect possibly you have the incorrect spark plug installed which is allowing piston to contact it preventing complete rotation of engine.
Or possibly the engine has so much compression that you are not used to it and it is making you believe the engine will not rotate with spark plug inserted?.

Sep 23, 2014 | Poulan Garden

2 Answers

ryobi 40cc chainsaw chain oiler function not working

1) check oil supply holes in the bar
2) With the bar removed, run the engine for 30 seconds, does oil come out of the side of the saw.
3) If no oil on the side of the saw, inspect the clutch drive spring and worm gear on oil pump shaft

Outboard drums (drums on the outside of the clutch) are held on by a nut or e-clip.

Inboard drums are held on by the clutch which is threaded onto the crankshaft. And there is the challange.
***NOTE all chain saw clutches have LEFT hand threads, so, rightey loosey, lefty tightey. (just backwards from everything else)

this will most certainly shear the flywheel key or damage the flywheel !!!!! (after 35 years, you can ask me how I know that, LOL)

1) Use a piston stop to hold piston from moving: THIS IS A MUST !!!
Ok, so you do not have one, let's make one.
a) remove the spark plug
b) insert a piece of recoil rope into the cylinder hole, leaving a tail to remove it by. (rope, large shoe string, anything that is soft, that is aprox 1/4 to 5/16 in diameter to place into the spark plug hole to help the piston to stop it's travel by filling up the empty space. Just make sure you can remove it later)
c) secure the saw (extra set of hands may be needed) and with a suitable wrench on the clutch center, rotate the clutch to the right until piston comes to a stop. With a hammer, tap the wrench to aid in rotation. This can be very difficult, and may take several taps.
d) after removed, inspect and grease the drum bearing before re-assemlby.
e) upon re-assembly of clutch, tighten by hand only, NO hammer required. The force of the chain will tighten the clutch.
f) remove the rope, and re-install the spark plug.

Nov 16, 2009 | Ryobi Garden

2 Answers

how to get the sprocket clutch off

Watch this and apply what you learn. It's really quite simple.
R² Drive Link Outboard Clutch by Drivelink.blogspot.com
  1. Check the IPL for your saw to see if any special tools are needed.
  2. There are metal piston stops available, when square (almost never) with the piston top these work well, if not square they have been known to punch through the piston. I suggest a length of starter cord or nylon rope be used instead of the piston stop (retain 6" ± so you can remove it). Make sure the piston is near the top of the cylinder before feeding the cord or it can fall through the exhaust port and damage the piston as it rises.
  3. Everyone I’ve ever removed had a left handed thread (tighten it to loosen it).
    Let us know how it worked for you. GL

Nov 13, 2009 | Husqvarna Garden

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