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 Not quite completely OT: gas/oil mix for old saw		  New Topic  Topic Locked
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Initially Posted - 10/10/2010 :  01:02:44  Show Profile  Visit delliottg's Homepage
Rita volunteers at a thrift store, and they recently got an old Poulan chainsaw donated. The manager didn't want it in the store because it stank of gas, so she priced it very aggressively to move it quickly. Long story short, I bought a really old heavy duty 24" chainsaw for $30.

How do I figure out the proper mixture for the gas/oil ratio? I'm guessing this thing isn't a whole lot younger than me, but it tried to start on about the 5th pull, and looked reasonably well tended to for an old logging style saw, not like my toy Poulan I've been using for years. Ive tried to look it up online, but no luck so far.

Any ideas?
David
C-250 Mainsheet Editor


Sirius Lepak
1997 C-250 WK TR #271 --Seattle area Port Captain --
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islander
Master Marine Consultant

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USA
4024 Posts
Response Posted - 10/10/2010 :  05:59:55  Show Profile
Most of the older 2cyl engines ran on a 50:1 ratio Newer ones will be at 100:1. You can't go wrong with the 50:1. Better to have more oil than less. Try it and see how it runs.
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Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts
Response Posted - 10/10/2010 :  06:27:54  Show Profile  Visit Arlyn Stewart's Homepage
My '70s vintage (Homelite) chain saw is 32:1 as is my '83 weed trimmer both still in service.

My gas model airplane engines run on 40:1 but they are cooled really well.

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DaveR
Master Marine Consultant

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USA
2015 Posts
Response Posted - 10/10/2010 :  08:20:46  Show Profile  Visit DaveR's Homepage
I'd go to the manufacturers site, find their phone number and give them a call. What is the model number?
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Stinkpotter
Master Marine Consultant

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Djibouti
9081 Posts
Response Posted - 10/10/2010 :  09:05:23  Show Profile
50:1 is a little light for older 2-stroke power tools... I'd go with 32:1 until you find out otherwise. Some older small engines even call for 25:1. When in doubt, it's better to foul a few plugs than to burn up the engine.
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GaryB
Master Marine Consultant

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USA
4304 Posts
Response Posted - 10/10/2010 :  09:09:15  Show Profile
24:1 was used before the late 60's/early 70's.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.