i just read all the thread and can't believe no one mentioned the main two stroke killer here...with all the knowledge floating around on this forum (not been smart or anything) just strange no one mentioned this.
you don't need more oil,you need the proper mix and you need to be exact (100mills syntetic oil to 5liters) is perfect. (50:1)
if you run anymore than this it is a problem and the main problem for all two stroke engines is carbon build up,when you use extra oil all you will do is cake the top of the piston with carbon,it's obviously bad when you use a lower mix,but equally as bad if you use more oil,this is the reason for piston/cylinder failuers,now i am just speaking about standard saws from the factory,that rev out to max 13000rpms (aprox) mix ratios and oils are differnt for tuned saws.the carbon is a nuissance with extra oil as it hardens and can fall between the cylinder walls and scratch and damage the bore and ring.
i race two stroke 5th scale R/C model cars,it's very important we use the correct oil and amount,as i say the carbon is the problem on the piston crown,it upsets the squish band,usually not a bad thing cause the extra carbon can give you more power on top of the piston at times,but it's better to keep it off and the correct oil ratio does exactly that,it keeps this harmfull carbon deposits away from the piston crown and exhaust ports,good oil also helps with the proper additives in it to keep carbon down.
our model car engines run 40:1 mix but these two stroke highly tuned 23cc engines can reach 25000rpms,now you can afford to use a little extra oil if needs be but 40:1 is perfect.
now why on earth would you want to use EXTRA oil on a low revving 12500rpm chainsaw engine? madness....if anything a little less oil to keep down the carbon,BUT NO stick with the reccomended 50:1 it will be fine.
so in a nutshell if you run more oil you think you are doing the saw good,the engine is actually going to be worse off long term and the life will be shortened,aswell as this the extra oil will burn in the case and destroy the bearings!!
twostroke engines are very small and simple,you need just enough oil to keep things cool and good carb settings,i always use 50:1 mix,never any problems,never even need to change plugs.
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