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Author Topic: PP4218A Won't Start  (Read 166 times)

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Offline Ikester

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PP4218A Won't Start
« on: February 22, 2021, 02:56:24 PM »
Unfortunately I left fuel in the tank from last fall until now.  The saw won't start.  I have replaced the carburetor, spark plug, air filter etc.  Checking the ignition I do see a spark, but it's not as intense as on cars.  One post says if you can see a spark at all it's OK. So, it has air, fuel, spark and compression, how do I get it to start?  Appreciate all help.

Offline DHansen

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Re: PP4218A Won't Start
« Reply #1 on: February 22, 2021, 03:18:42 PM »
What did you do to confirm it is getting fuel?  Does if fire at all? 

Offline sawguy21

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Re: PP4218A Won't Start
« Reply #2 on: February 22, 2021, 03:20:49 PM »
Squirt some mixed gas in the carb throat, don't overdo it, and see if it fires. If it pops you have narrowed down the problem.
old age and treachery will always overcome youth and enthusiasm

Offline Guydreads

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Re: PP4218A Won't Start
« Reply #3 on: February 22, 2021, 03:22:48 PM »
Is the fuel line connected lol???? Believe it or not, I have done that twice in 2 months. Yikes. The fact that it doesn't seem to fire seems surprising to me. Welcome to the Forum!

Offline Tacotodd

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Re: PP4218A Won't Start
« Reply #4 on: February 22, 2021, 03:26:50 PM »
How much compression does the gauge show?  

Its also possible that it has slipped time, as in the flywheel spun on the crank a little. It dont take much.

The spark and fuel and compression are a good thing, but its got have enough compression and the timing also has to be correct. 

Its also got to get enough fuel to continue to run once its started. 

You appear to be on the right path to track down your problem.

I got to thinking, its possible that you arent pulling it hard enough. Dont get me wrong, cause its happened to me before! I felt like a moron when I took it to my dealer whos also a friend of mine. We laughed when he got it started in 3 pulls! My fault and nobody else was to blame! No charge, probably because we BOTH took it in stride.
Trying harder everyday.

Offline Ikester

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Re: PP4218A Won't Start
« Reply #5 on: February 23, 2021, 01:19:38 PM »
Thanks for all the helpful replies.  The fuel line is connected and the primer works (at least the bulb fills).  I checked compression with 4 strong pulls and it is 25 lbs.  Don't know if that is good or bad.  The brand new spark plug had black residue on in after initial installation and 3 attempts to start.  I doesn't sound like it has fired though.  Haven't touched the ignition module (yet) so not sure if timing has slipped.  This sure seems more complicated than working on my first car (1956 Chevy).  Thanks again Y'all.

Offline sawguy21

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Re: PP4218A Won't Start
« Reply #6 on: February 23, 2021, 02:35:24 PM »
Umm, you need 125 pounds for it to do anything. Either the guage is toasted or the saw is.
old age and treachery will always overcome youth and enthusiasm

Offline lxskllr

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Re: PP4218A Won't Start
« Reply #7 on: February 23, 2021, 03:15:08 PM »
My vote is on the gauge. The saw worked last time he used it, and I don't think the saw lost compression just sitting there. You'd feel it pulling it over too. Probably be as easy to pull over as a spinning top.

Offline Ikester

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Re: PP4218A Won't Start
« Reply #8 on: February 23, 2021, 06:45:12 PM »
Checked the gauge on my push mower and it read 80 lbs.  So I guess the saw is a paperweight now.

Offline Guydreads

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Re: PP4218A Won't Start
« Reply #9 on: February 24, 2021, 02:45:03 AM »
Well, first step in this case would be to remove your muffler obviously, and check for scoring there... If there's nothing, then you might want to try re-testing the compression to make sure you got a proper reading. If you still get 25 lbs. you probably have scoring on the intake or sides of the piston. My guess would be on the exhaust side, and usually that points to no oil in the gas, or overheating due to no load on the saw (dull chain, running it without bar and chain at full throttle (never recommendable) etc.) Let us know what you find out, please.


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