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Discussion in 'Motorized Bicycle General Discussion' started by Retmachinist, Jul 24, 2009.
Lol, we all wish it worked like that
Yes LS614 is right on about the expansion chamber or just a good free flowing exhaust period, it make no difference what you are putting into the engine if you cant get it out just as good so it can breath properly, you may even try a # 74 bit and just play with the needle to find that sweet spot, my engine 4 stroke just a bit unless under a slight load, I know some say they have zero 4stroking and that might be true, but I have had mine in the NO 4 Stroking Zone as well and they ran to hot and thus to lean so I richened them back up a bit, I ride 7-8 miles at WOT sometimes and if an engine is running lean it will cook down running like that so I dont mind the slight braaaaaaap at low speed and no load, I still get 41mph WOT with no wind, very flat ground on a good day and 36-38 mph at will wit a very comfortable cruise speed of 30-32mph with no 45 stroking at this speed.
I have manic intakes on mine and free flowing exhaust, the exhaust makes the biggest difference of all on these engines in my experience when it comes to instant noticable improvement in the way they run and pull hills.
Good luck and get a better exhaust asap and then along with the carb. tuning you will see a nice difference..........
without higher compression and a very good exhaust, I cant see the 18mm Mikuni carb doing very well on these engines, you will need to mix a good bit of fuel with that volume of air flow that 18mm will give you which may just be a bit much for the china girl, some fellas have got 45+mph using a well tuned NT carb. and a few other goodies, but I have been wrong a gillion times before too! so I say give it a shot and let us know what you nd up with.....
Man, it truly is amazing how long this thread is this oil is amazing. Just thought I'd share new news I was at napa today and discovered "sten mix" in packets that you mix at 100:1 I read the fine print and it's made by interlube, so it is re-branded opti. Just another way of using an excellent oil
Unfortunately didn't work out for me. Went to Napa today and couldn't find it. They checked the system and didn't see it either. They said that it may have been an independently owned store with their own stock.
I got mine at a local True Value hardware store. Best I can find everywhere else is Echo.
Sorry you couldn't find it, yeah, must be a local thing, but remember, if you see Sten mix packets, it's the same thing
Are there any race teams using opti?
It was posted earlier that tractor supply has opti under the arnold name, I'ts where i buy it for my weed blower and trimmer.
Not your MB too? How come?
Yes there is.
CulverCityClassic is running Opti-4 in his 11 hp 4 stroke monsta bike....
and of course Bairdco Industries have been running Opti-2 in
all their 2 stroke race bikes for a long time.
Interlube sponsored the Willow Springs race and continues to be
a sponsor of Motorized Bicycle racing in SoCal.
Opti2? Not that I know of, because it's not a racing oil. Real power is not made with low oil mix ratios.
Agreed with Pablo, engines like the flavor of Opti-2, but you get better HP with Klotz or some other racing oil mixed at 32:1. Still, I love Opti-2 myself and I'm sold on it
I have run the opti in my bike but will need more tuning to run it full time, I have it running good on the lucas oil at 40 to 1
I notice Pablo has a chip on his shoulder when it comes to Opti-2, but I have several thousand miles..... HARD miles... Off road, on road, 90% of its life has been at WOT, and not once have i slung a rod, or marred my cylinder walls, and I average over 35mph, with a top speed at 41, clocked by police. So I swear by it, and will never use anything else. There may be "better" stuff out there, but i doubt it. For the performance and the longevity of the motor, this is the best.
Pablo is just observing reality. There are hundreds of professional 2 stroke race teams in the world. If none of them are using opti, there's probably a good reason. If opti was better than the oil they're using I'm sure they would use it.
In addition, look online at forums for professionals that use 2 stroke engines for a living, like lumberjacks, or yard workers. Opti isn't even on their radar.
I do have a couple of customers that own lawn equipment business's. Everytime I ask about using opti, they always advise against it. It just seems odd that in all the world only motor bicycle riders seem to like the stuff, and not many of them.
there are many forums with other "professionals" using opti2. i've seen lawnmower, chainsaw, tractor, and others, and all the threads parallel ours. everyone who uses it loves it, and everyone who's never tried it, condemns it.
i dunno why opti2 desn't sponsor any racers. they seem to like having an underground cult status. as far as the HP output, all the bikes i've run on opti are much faster than the ones on any other oil. that's not scientific, but it's good enough for me.
another thing to consider, is factory teams get free stuff. i know many people who use inferior products because it's free, and they get paid to do so. i'm a perfect example. i rode skateboards for Vision in the 80's, and hated almost all of their products. the decks i rode were custom made, i destroyed a pair of their shoes on a weekly basis, and flat-spotted their wheels every other day.
but they sent me truckloads of products, so it never mattered.
No chip at all. I have never said one bad thing about Opti.
Choose ANY brand of 100:1 oil. Mix it truly 100:1. Choose a variety of racing oils. Mix them at 15:1, 20:1, 25:1. Run them all scientifically, in a double blind study on a real calibrated dyno in the SAME engine. I happen to know for a fact which oil ratio would have a higher power output. This does not mean "chip on my shoulder".
Sorry, I just keep an open mind.
So Pablo, what are some of the other 100:1 brands that you know of?
Amsoil, Dolmar and couple other rebrands that I'm not sure who makes them.
pablo is a Amsoil dealer.