How much 2-stroke, and why?

[motopsycho87]

Ok, leading on from my Mod's post, just curious as to your recommended 2-stroke ratios, and the reasoning behind them. I am not trying to cause an argument, just trying to share information and do what's best for my bike, if there is substantial evidence proving me incorrect, I WILL CHANGE MY MIND!

I use 32:1 semi-synthetic, why?

http://www.bridgestonemotorcycle.com...oilpremix6.pdf - Gordon Jennings
http://www.klemmvintage.com/oils.htm - Vintage 2 stroke racing folks, claiming more is better
http://www.2strokeheads.com/OIL-TECH.htm - Claims mineral is better
http://www.dansmc.com/2stroke_oil.htm - Claims more is better
http://www.challengers101.com/EngineOils.html - Claims mineral / semi leaves better film
http://www.wdarc.org/articles_files/...Oil%20Test.pdf - Numerous oils tested at recommended ratios on RC engines.
http://ffv8.com/2-stroke-oils.html - Racing engines, more is better.
http://forum.dirtrider.com/discussio...20/spooge-101- - MX More is better
http://www.maximausa.com/tech-tips/oil-migration.php - 2 stroke oil mitigation testing

Attached is an excerpt from A Graham Bell's 2 stroke tuning.

[Ud_luz]

I'll run anywhere from 32:1 in my yz250 to 80:1 in my Montesa trials bike. In the ec300 I run 50:1 and have over 400 hours on it with little compression loss.

Bell's suggestions were using oil from years ago in a small highly stressed engine. Oil ratios can vary greatly depending on displacement and how hard you ride it.

My understanding is anything more more than 19:1 has no affect in any way. For trail riding a 300 even 50:1 with synthetic oil probably isn't necessary. The rule of thumb is about 1/4" in the crankcase regardless of mixture.

[Stoby]

I run amsoil at 32-1 used to do 40-1 cause I was scared of 50-1
Grew up doing 32-1 .I'm an ex wrench and I know more oil is almost always better than not enough in most things .I am not fast enough or able to tell if I have 1 horsepower more or less so even if I lost a little power using too much oil I wouldnt care,But i've read different things saying you don't etc.
all meaningless to me .If I'm not fouling plugs -never do, then i'd rather run more oil and believe my crank rods pistons & rings are slipperier and cooler
therefore happier
But I think to each his own its hard to change a mans opinions and really who cares its our hobby ,love, passion. not a job. But you 100-1 guys are NUTS!!1
HA!
Stoby

[Ud_luz]

Originally Posted by Stoby

you 100-1 guys are NUTS!!
Stoby

Common with trials bikes. I wouldn't run that in my other bikes though.

[motopsycho87]

I'd love to know exactly how 2 stroke oil technology has changed. I mean, these tests were completed at a time when all the major manufacturers were pumping massive amounts of money into their 2 stroke engines, and feeding them oil would have been a huge business, compared to now where 2 strokes are generally for hobbyists only.


At the end of the day none of these 2 stroke companies actually manufacture their oil, its all bought in then they add their additive packages. And the only tests we see are that one runs better than another at 80:1, is this because they all run well at lower ratios and the results would be negligible so the only way to prove their value is by comparing the difference in extreme oil deprivation scenarios?

[noobi]

Why does 32:1 even exist as a ratio? Is it to do with that wonky other measurement system?
40:1 here, I might run 30:1 one day and see if I notice the difference. I doubt it though.
I don't need more power to start with, and very few people actually do.
As for having more oil coating the engine, I suppose that is true, but depends just as much on how you ride and what oil you run, as much as how much oil is in the fuel.

[Elvis74]

I run 50:1 in my 144cc gasgas and I have almost 80 hours with the first piston on it. I checked the zhlinder and piston last week and there is no reason the change it. The zhlinder playing is still lookin good and both, zhlinder and piston are still in tolerance.
I used motul800 and now I am riding the putoline mx9.

[motopsycho87]

Originally Posted by noobi

Why does 32:1 even exist as a ratio? Is it to do with that wonky other measurement system?
40:1 here, I might run 30:1 one day and see if I notice the difference. I doubt it though.
I don't need more power to start with, and very few people actually do.
As for having more oil coating the engine, I suppose that is true, but depends just as much on how you ride and what oil you run, as much as how much oil is in the fuel.

Because the silly old school measuring system we used to and the yank still do use. Though most bike manufacturers accept this is a good compromise ratio with regards to all round use / emissions etc...

32:1 = 4oz oil to 1 gallon fuel

50:1 = 2%

33:1 = 3%

25:1 = 4%


http://www.howtomotorcyclerepair.com...-2007-2008.pdf - Kawasaki recommend 32:1 in their kx125 and kx250

RM125 recommends 30:1 even with the good stuff!! even though motul recommends themselves 50:1

What makes us think our engines are any different? I can understand if you literally poodle in the woods and never open it up, but I'd hate to have the fear of seizure every time I whack my throttle open!!

[Garytee]

When i first got my bike i went and had a chat with my local man (Paul Nash). I do mostly green laning so he suggested i run Putoline MX2 @ 40:1 all day. Not had any problems so far apart from spooge out of the tailpipe which i hope to cure with correct jetting (when i get around to it).
Just my 2p worth based on advice from someone who knows far more than me about these bikes.


2004 EC 200

[Coop]

Have you actually read your Gas Gas owner's manual? Mine says 50:1 synthetic, 32:1 non-synthetic.