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Compression spec for a craftsman 42 cc chainsaw

What are the compression specs for this saw?

Posted by Anonymous on


6 Suggested Answers

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: start a chainsaw

took it to a shop

Posted on Jan 15, 2009

  • 2692 Answers

SOURCE: need parts for ryobi pcn3335

Posted on Jan 18, 2009

  • 83 Answers

SOURCE: 46 cc Sears/Poulan chainsaw will not start

Four things I can think of:
1) There is a short in your spark plug wire. When you bend it to connect the plug in the machine it allows the exposed cable to contact the engine block. Examine the wire all the way to the coil.

2) Flywheel key is sheared ( you obviously know how to take off the flywheel since you checked the seals).

3) Flywheel air gap is not set correctly. Loosen the coil. Put the cover of a notebook or the cardboard piece of a cigarette pack between the magnetic portion of the flywheel and the coil. Tighten the coil down. This will get you the proper gap.

4) Your cylinder/piston or rings are scrubbed out. Even though it passed a compression test, on rare occasions it will loose compression only when it fires. So do the following:

Remove your exhaust manifold. Look into the cylinder with a flash light. You are looking for scratches. Anything larger then a light fingernail is definite proof you need a new cylinder/piston assy.

If it passes that test do the following:

Pour mixed fuel straight into your cylinder until 1/4 full. Slowly pull your saw over while looking into the cylinder. If you see bubbles after the ring/rings go by then you need a new cylinder/piston assy. On rare occasions if no scratches are present on the cylinder wall or piston, you may be able to change just the rings.

First if you can get a inline spark tester so you can see if your getting spark with the plug installed.

Posted on Mar 31, 2009

  • 87 Answers

SOURCE: Owners manual for Craftsman 20 in chain saw, needed

Parts manual, have model # available

Posted on Apr 09, 2009

  • 2220 Answers

SOURCE: specs on 4620avx chain

Both questions are answered on page 16 here (if original chain):

Quite a few of the questions on this page apply to your undertaking.
Please take few minutes to read any that may remotely apply. A few minutes spent here may prevent the frustration of a chain that will not cut straight through teh log.

If you have more questions or need additional help please reply below and I will get back to you. HTH & Good Luck.
Thank You for using FixYa.

Posted on May 02, 2010

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Hi chuckbjr44,
Have you checked the compression ?The way to do that is take the plug out and ground the plug wire by tying it out of the way so that it touches on some metal .Use a compression gauge while a friend pulls the rope.It sounds like rings to me. Thank you for using Fix Ya. ps you can a local repair shop for the specs on the right compression for your saw.

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I have a new 18'' craftsman, couldnt resist the price 42 cc, but i want a bigger chain, it has a standard 3/8 small chain for trimming branches, I know to do this will require a different bar and sprocket...

Many time the big chain stores (like Sears, Wal Mart, etc.) will have products made to their own specs (re:cheaper), which makes getting replacement parts difficult at best and impossible at worst. Another reason they do this is so that you won't be able to find the exact same model elsewhere at a better price and force them to match or beat it. It's entirely possible that if you can't find the longer bar & chain at Sears, you won't find it anywhere.

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Basics to check:
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2) Muffler remove for inspection
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The IPL will help. Pay attention to the year there is a different area for older saws.
For a current saw Craftsman should have something available.

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