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8 Apr 2007
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Contributing Member
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Join Date: Nov 2006
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2 stroke mixture?
me and my mate are having dispute over 2 stroke mixture. at 25-1 mix i say it's 25 parts fuel to 1 part oil. my mate reckons its 25ml of oil in 1 liter of fuel? please sort this out for us and help him before he blows up his sons scrambler!
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8 Apr 2007
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Large Golden Member
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Join Date: Aug 2005
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25 parts of fuel to 1 part oil is the correct mixture .
25 ml oil in 1liter of fuel would be 40:1 .
__________________
Blessed are the cracked, for they let in the light. - Spike Milligan
"When you come to a fork in the road ,take it ! When you come to a spoon in the road ,take that also ."
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8 Apr 2007
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Registered Users
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Join Date: Oct 2004
Location: NSW
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Correct Ratio
Most Chain Saws (and most modern 2ST engines) use 40:1 Ratio Fuel :Oil
25:1 Ratio Fuel :Oil is for old engines and makes them very smoky
More oil (in the mix) = longer piston/ring life but suffer oiled up plugs if not running at design RPM
Less oil = more power and more wear but if the engine has a Chrome bore does not lower engine life
So the answer is run the 40:1 mix with plated bores safely if steel bore engine will wear faster but give more power
If the engine is run at low revs for long periods then some were in between is right!
Joe
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9 Apr 2007
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2 stroke mix
If you like your crankshaft run a richer oil mixture. The top end will run on a lean mixture of oil but the bottom end likes oil. Sparkplugs are cheap. The type and quality of oil also makes a vast difference.
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9 Apr 2007
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R.I.P.
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not regular.
Good luck, have fun.
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Patrick passed Dec 2018. RIP Patrick!
Last edited by mollydog; 26 Mar 2009 at 05:35.
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9 Apr 2007
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Large Golden Member
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Join Date: Aug 2005
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Well you can go as lean as 100:1 with modern high performance synthetic oil but that wasn't the question .
The question was how to work out a 25:1 fuel to oil mixture ,which by the way is 40 ml to one litre of fuel .
My first bike ran a 16:1 mixture [ half a pint to a gallon - a British gallon as well by gad ] and was delightfully smokey helped by a bit of castor racing oil ,bloody marvellous smell too .
__________________
Blessed are the cracked, for they let in the light. - Spike Milligan
"When you come to a fork in the road ,take it ! When you come to a spoon in the road ,take that also ."
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