Go Back   Tech Support Forum > Automotive Center > Small Engines

Chainsaw engine rebuild

This is a discussion on Chainsaw engine rebuild within the Small Engines forums, part of the Tech Support Forum category. I have a poulan pro 4218 avx chain saw which doesnot I idle correctly and stalls on acceleration. I took

Closed Thread
Thread Tools Search this Thread
Old 10-01-2009, 01:49 PM   #1
Registered Member
Join Date: Oct 2009
Posts: 1
OS: xp

I have a poulan pro 4218 avx chain saw which doesnot I idle correctly and stalls on acceleration. I took chainsaw to a dealer for repair and dealer told me that chainsaw didnot have compression. My question is what special mechanical tools and jigs are needed to rebuild engine. Any advise appreciated !

Louisd1 is offline  
Sponsored Links
Old 10-13-2009, 05:29 AM   #2
Registered Member
Join Date: Oct 2009
Posts: 4
OS: xp

Before you start taking things apart I would confirm what the dealer said is true.To me it sounds more carburetor related than a compression issue.I always found that if you had resistance when you pulled the cord you have got compression. As far as tools for the rebuild I have never done one but I know you will need a special tool for the piston rings and some thing for the valves.
Good luck.
vmaxrich is offline  
Old 10-13-2009, 09:36 AM   #3
Registered Member
Join Date: Oct 2009
Posts: 26
OS: 2000 Professional

I agree with vmax check your compression (you can go to a small engine shop) If you have bad compression sometimes you can have the cylinders honed and throw a set of new .02 or .03 over rings on the piston and she will come right to life. If you've never refreshed an engine it is kind of a daunting task. I would have a small engine mechanic work on it.

Hopefully its just your carburetor then its a matter of cleaning the thing or rebuilding it.
Vatar is offline  
Old 10-15-2009, 05:08 PM   #4
Engines are Afeared of Me
K-B's Avatar
Join Date: Oct 2005
Location: New York
Posts: 3,152
OS: Windows 7, Windows 8

My System

What you're describing could definitely be a compression issue. A quick and easy way to perform a compression check is to lift the saw off the floor by the starter handle. If it steadily drops, the compression is too low. Normally, it will drop a bit, then a marked pause, then drop a bit more.

If the compression is low, I'd probably toss the saw and get something better (Honestly, that's a pretty junky/cheap saw).

If it DOES have low compression, don't try messing with it trying to hone the cylinder, etc. For one thing, there is no such thing as an oversize ring for it. Those cylinders are unplated (bare aluminum, easily scored). You're going to need a new piston & cylinder if you want to do it right. You actually don't HAVE to have any special tools, although they do make it easier. (There are no valves, btw). A piston & cylinder set will run you around $60.
K-B is offline  
Old 11-15-2009, 11:18 PM   #5
Registered Member
mstpops's Avatar
Join Date: Oct 2009
Location: new zealand
Posts: 68
OS: xp

re chainsaw rebuild -before thinking compression problems do a compression test
have a look with the muffler off @ the cylinder and bore any scores or marks ?
rings should still be spongy compression should be about off the top of my head no lower than about 115 psi approx certainly the absolute btm limit for most machines is about 100 psi spark test loaded and un loaded should jump a 6 - 8 mm gap - carburettor should be rebuilt with a new carb kit & setup barrell,bolts should be tight -muffler should be clear with no carbon build up, air filter clean , tank breather ok, fuel lines with no holes ,and fuel filter new , - be sure to pressure and vacuum test crankcase for leaks @ seals and base gasket,at manfifold block or boot , check boot for holes -

have a look cheers mstpops
mstpops is offline  
Closed Thread

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is on
Smilies are on
[IMG] code is on
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Post a Question

» Site Navigation
 > FAQ

All times are GMT -7. The time now is 03:23 PM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 2001 - 2015, Tech Support Forum

Windows 7 - Windows XP - Windows Vista - Trojan Removal - Spyware Removal - Virus Removal - Networking - Security - Top Web Hosts


Partially Powered By Products Found At Lampwrights.com