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I have changed my spark plug and checked my fuel lines on my roybi 40cc chain saw and it will start but it will not stay running. where do i go from here

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Have you checked for an air filter? It needs oxygen to operate. There mmay be a filter in the gas line and if it's clogged it can't get enough fuel once it starts.

Posted on Nov 06, 2012

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Posted on Jan 02, 2017

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SOURCE: I have a Benchmark chain saw - replaced brittle fuel lines

sounds like your clunk has come free from fuel line or it is stuck at top of fuel tank. i would empty tank and see if clunk is free by giving the saw a good shake if you cant here the rattel of the clunk you have found the problem PS clunk is a weight attached to the end of your fuel line in tank it makes the line stay at the bottom of the tank

Posted on Sep 06, 2009

dontbother10
  • 2220 Answers

SOURCE: have craftsman chain saw, runs ok for a few

The plugged vent gets my vote. Loosen the fuel cap when it starts to starve.

All Poulan IPLs (exploded parts list) are here:
Poulan.com
http://www.ordertree.com/modelinfo/POULAN-WEED-EATER/75.59.html
Find your model, what little fuel system detail there is can be found on it. HTH
Lou

Posted on Oct 04, 2009

dontbother10
  • 2220 Answers

SOURCE: mcculloch 3516 chain saw, does not always start.

It must have spark, fuel and compression to run. Your task is to figure out which is missing.
Sometimes electrical components quit operating once beyond a certain temperature. Does it always start cold and become tempermental when warm?
IMO most hard start problems on a chainsaw with a good fuel delivery system are flooded.
Start Procedure
Cold:

  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4)
  4. Set compression release – optional step even if saw is equipped with a compression release
  5. Push (open) choke pull starter until it starts. (usually first pull)
Warm:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) - Don’t pull with choke closed.
  4. Push (open) choke, pull starter until it starts. (usually first pull)
The 3516 is a MTD McCulloch (Chinese). These saws are in a class by themselves. Good Luck
Lou

Posted on Nov 15, 2009

dontbother10
  • 2220 Answers

SOURCE: Homelite XL 103 chain saw 1967 will not start-

Is this your saw?
Chain Saw Collectors Corner
http://www.acresinternet.com/cscc.nsf/ed1d619968136da688256af40002b8f7/cc8b1cfa0c6e498d88256c28006444b1?OpenDocument

If this grand old lady were mine I would part with a few $(40±) for a tune up and and maybe an additional $20 if carburetor needs rebuild at my friendly neighborhood Stihl dealer. They perform pressure tests most homeowners cannot. An undetected air leak can destroy your saw. She deserves better.
HTH
Lou

Posted on Feb 20, 2010

dontbother10
  • 2220 Answers

SOURCE: 142 chain saw. Starts but will not pick up when

Remove, clean and reinstall the muffler and spark arrestor, if no better the "L" needle may need adjustment.
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm

  • CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
  • Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.
  • Clean the spark arrestor and muffler; if the saw cannot exhale it cannot inhale.
  • There are 2 wav (sound - idle & full - may not be highlighted) files that I find most helpful, I think you will too.
Most chainsaws die because they are are run lean. I am going to inject a little Lou theory here. Air leaks and defective fuel delivery systems account for most chainsaw failures. Constant adjustment of needle valves can easily camouflage more serious problems that result in burning up your saw.

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

Posted on Mar 22, 2010

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Remove the plug, connect a jumper wire between the threaded part of the plug and the cooling fins, Switch the ignition on, take it into a dark room and pull the starter. You should see a spark at the tip of the plug. HTH
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