Author Topic: Oil ratio on a 2000 288xp, a 90 262xp and a 550 xp  (Read 558 times)

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Offline Jason K

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Oil ratio on a 2000 288xp, a 90 262xp and a 550 xp
« on: May 24, 2015, 07:41:50 pm »
I normally fun 40 to 1 with uncut fuel as not blended. 91 oct is the gas I can find. Plus I need to run the same fuel in my 550xp. Would I be ok with what I have already 40to1 91oct. Would that be ok or all my saws. Or could I run aviation fuel 100 oct with low low lead.. The only thing is my 550xp . Manual says no lead. So what should I do


Please let me know..

Thanks
Jason

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Offline mdavlee .

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The 100 LL will work in them all. 40:1 is fine.

Offline wild262

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               Your 40:1 is fine, as long as your saws are tuned to it. I have a 288 and a early 262.  Love them both.  As for the   550, if it is still under warrentee, than run what they recomend till it runs out, just to be safe.  The best combination that works for me is; Non-eythnol 89-92 oct. with Stihl Ultra oil mix.   This has been "good" up to 6-months or more for me.  Any longer than that it goes in the tractor.    If you use eythnol laced gas, figure 1-2 months at most with the Ultra in it.  Just make sure you tune the carb. to the mix ratio. Enjoy  :)

Offline Jason K

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100LL it is then.. Thanks guys.


Thanks
Jason

Offline alsled

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My guess would be 100ll will be ultra safe fuel, along with making less power then 91 octane. There is not enough compression and timing in a stock engine to use the advantages of high octane.

Offline HolmenTree

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Very true alsled
Those 91 octane canned fuel mixs Stihl and Husky sell prove how well a stock saw can run.
Also not forgetting to mention  the 2 year shelf life after  opening 
Making a living with a saw since age 16.

Offline SawTroll

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I see no reason to not use 50:1 in them all - but I use only the Aspen premixed alkylat fuel that Husky etc. sells.

Offline alsled

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50-1 on the piston and rings is fine.  It's those little itty bitty crank bearings.   Little more oil won't hurt them. I run my saws, weed wackier, leaf blower, snowblower at 32:1. Redline race oil.   I use this oil in my snowmobile, 180 hp 8600 rpm. So far so good.

Offline HolmenTree

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The oil lubricating demands are different for a liquid cooled  snowmobile engine then a air cooled chainsaw powerhead. ;)
Making a living with a saw since age 16.

Offline aclarke

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Ive never seen bottom end failures on work saws, but Cliff mentioned he used to have crank bearing failures on the saws run at 50 to 1 in the woods.  Didn't Bell do a test on mix ratios from 16 to 40-1 and found the richer mix made more hp? 

 

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