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Old 06-17-2010, 10:23 PM
fastr1 fastr1 is offline
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New Stihl FS90 Amsoil Saber?

I am purchasing a new FS90 4 mix and I use and sell Amsoil to all my friends however is the 4 mix engine safe to run at 100 to 1 like conventional 2 strokes that I run it in? I know the Amsoil is great however I have read posts that people are running these at 50-80 to 1.

Since if something happens it would be a rough warranty claim i'm sure.

Thanks,
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Old 06-17-2010, 10:27 PM
IOWA GUY IOWA GUY is offline
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Quote:
Originally Posted by fastr1 View Post
I am purchasing a new FS90 4 mix and I use and sell Amsoil to all my friends however is the 4 mix engine safe to run at 100 to 1 like conventional 2 strokes that I run it in? I know the Amsoil is great however I have read posts that people are running these at 50-80 to 1.

Since if something happens it would be a rough warranty claim i'm sure.

Thanks,
It's much better to run to much oil than not enough.
If you run to much oil it will "foul" a plug.
Not enough oil and you may seize a piston and the games over.
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  #3  
Old 06-17-2010, 10:41 PM
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Alan0354 Alan0354 is offline
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Lots of people use 75:1 with good result. I use 60:1 myself.
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Old 06-17-2010, 11:06 PM
IOWA GUY IOWA GUY is offline
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Originally Posted by Alan0354 View Post
Lots of people use 75:1 with good result. I use 60:1 myself.
Alan has anyone ever told you that you look a lot like Sarah Palin.
Yes,your HOTT!!!
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Old 06-17-2010, 11:42 PM
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Alan0354 Alan0354 is offline
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Originally Posted by IOWA GUY View Post
Alan has anyone ever told you that you look a lot like Sarah Palin.
Yes,your HOTT!!!
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  #6  
Old 06-18-2010, 06:39 AM
Roger Roger is offline
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I use Amsoil, 75:1, in my FS90R. When it was new, I ran through a few tanks of fuel at 50:1, then moved to 75:1. Did using a richer mixture while the engine was new help with longevity? I don't know.

I use the same mix for my Stihl BG85 blower, HS80 hedge clipper, and FC85 edger - all three are 2 cycle.
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  #7  
Old 06-18-2010, 07:47 AM
WH401 WH401 is offline
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I have used Saber at 80:1 w/ 89 gas since my 90 was new and it runs like a champ. The biggest reason most LCO's run 80:1 instead of 100:1 is because most LCO's use a lot of two-stroke mix in the course of a week. The simplest mixing method is dumping an 8 oz. bottle into a 5 gal. can of gas. That and while 80:1 is still a much lower concentration of oil, it still gives you a slight gap between the recommended 100:1.
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Old 06-18-2010, 09:19 AM
MikeKle MikeKle is offline
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I was all excited about switching to Amsoil, before I found out about the shipping cost! I was going to buy a couple quarts of saber 2 stroke oil, and the shipping was near $15.! Screw that,. I will just keep using the echo power blend. Do you all have another way of getting your amsoil other than shipping?
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Old 06-18-2010, 08:27 PM
Roger Roger is offline
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MikeKle, I can get Amsoil products from the local NAPA store. I don't know how universal this practice is found. Might be worth a try.
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Old 06-23-2010, 02:44 AM
Andyshine77 Andyshine77 is offline
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Result of running a gallon of Amsoil at 100:1 in an MS441 chainsaw. The saw was tuned correctly. The cylinder had aluminum transfer, and both the piston and cylinder were dry with no oil film. The saw was still running fine before tare down. however as you can see failure was imminent, If you look closely, the piston crown also has erosion do to over heating. Sure you can run Amsoil at 100:1 but premature engine failure will be the result every time, I've seen similar results with Opti 2. Amsoil is in fact a good group IV PAO oil but only when ran at more reasonable mix ratio like 50:1. It's also not a top of the line group V Ester based oil.
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Last edited by Andyshine77; 06-23-2010 at 02:52 AM.
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