Super Jet 40:1 or 50:1

kevbo

kevbo

Location
dfw
Isuzu brhxhshshsh
Jakobi86 said:
I believe I've read reports that the most power is made at below 32:1 by quite a bit, but the gas/oil ratio through the carb jet is right on. Basically the more oil you add the less gas will go trough, leaning it out. I've always broke in my engines with a few heat cycles and ten applying full load. Not full throttle, full load on the engine. Those rings NEED to be forced out to the wall so they can seat. There's a window of time here and most of its gone before a full tank is


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Next time I'll just wait til the rings will never wear in, then the rings will never wear out. LOL. Don't confuse a large four stroke with a high performance twostroke. One will be completely worn out before the other seals up.
 
Jakobi86

Jakobi86

I'm not going to argue. It gets no where. This is how I break in my two strokes. My engines run, and run good. I believe the crosshatch has a window of time to seat the rings properly. Once it's gone, it's gone. Everyone does their own thing. This is mine and it works for me


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Sinkhole

Sinkhole

Location
Livermore, ca
I'm new to riding. Less than three hours on my new superjet. But I do own several 2 stroke dirt bikes. One is a 2012 ktm300 that is recommended to run @ 60:1 with good Quality synthetic oil by the manufacture. My sons Ktm 105 is recommended to run @ 40:1. The new super jets are recommended to run 50:1. What this mean is the stock motor was built to run this mix. Racing are not racing. Your stock jetting is also jetted for this mix. Although I don't know how close Yamaha got the jetting in the sweet spot. So if you change your mix you will also change your jetting. More oil in the mix means less fuel more air leaner jetting. Less oil means more fuel less air in the mix richer jetting.

Older 2 stroke engines and non modern pre mix oils offen ran 32:1. But the newer modern breed engines with tighter clearances And higher quality oil's don't need 32:1 anymore. You can still run your ski at 40:1. You just need to understand that with the stock jetting you are running it leaner than stock. Which could be a good thing if the stock jetting is on the rich side. But if it isn't you'll get more Boggan by running it to lean. Also one of the advantages of less oil is you will have more gas to ride a little bit longer. :)
 
DAG

DAG

Yes, my balls tickled from that landing
Location
Charlotte, NC
I'm kind of being hypocritical bc I run r50 at 40:1 but 2stroke oil unlike 4 stroke oil is only used for one burn cycle and it's out the exhaust. Aka It's not heated and cooled and stressed repeatedly like in a 4 stroke. I haven't been convinced from anyone why a higher priced oil is better quality (2-stroke only) but r50 has a good smell and they won me on that alone lol
 
lanmine657

lanmine657

Location
fortcollins
DAG said:
I'm kind of being hypocritical bc I run r50 at 40:1 but 2stroke oil unlike 4 stroke oil is only used for one burn cycle and it's out the exhaust. Aka It's not heated and cooled and stressed repeatedly like in a 4 stroke. I haven't been convinced from anyone why a higher priced oil is better quality (2-stroke only) but r50 has a good smell and they won me on that alone lol
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I only r-50 too, can't beat the price and probly one best oils out there, castor927 is king but pricey and clogs power valve motors, r-50, bellray, hp2 all have a synthetic version of bean oil(castor oil) wont break down and will stay stuck to cylinder walls under high rpm and high heat also why you shouldn't use during break-in cause they lubricate so well that rings will have a hard time seating, cheaper oils,maxima super-m included, breakdown at high rpm. I'm no scientist but that's always been my understanding
 
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