You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the ATVConnection Forums community today!
The less oil you put in the richer it gets... add more oil and you lean it out. Seems crazy dosent it? that is what the 2 stroke tech class I took told me. Think of it like this, oil is thicker than gas, add more oil (say 11:1 and it cannot get threw the jet's in the carb as fast as 32:1 does and in affect leans out your jetting! Now say 100:1 would be super rich, but since there inst much oil in that ratio,, it will not lube the engine more just because it is running rich. I Jet everything I own at 32:1 but my friend loves running his CR500 at 16:1 because he has it jetted perfectly for it. Nice tan plug, gobs of power since OIL burns hotter than gas and never wears out a ring or piston. He also gets better mileage. Hope I explained myself clear enough. I beleve MR.Know it all in dirtbike mag also said this years ago..
I run my TRX 250R at 40:1 with super M and 101 octian it really kicks ***.The oils now days are really alot better then they used to be you don't need to run 20:1 or even 32:1. I've racing like that for years and even with the higher octian I haven't smoked a motor.
I agree, my 2 stroke class instructor uses 32:1 but also says 40:1 is great for 250cc plus size engines as they dont rev to the moon like a CR80 or 125 does. Personly 40:1 is great, but personly i would not go any leaner than 50:1.. I often joke with my friend and his 16:1 mix, fill her up with a quart of gas and a gallon of oil..