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Post by chamisataza on Feb 20, 2014 13:26:56 GMT -5
i have 21 oko carb and the main jet is 103 when i got it new..i am just wondering it eats a lot of gas..its running good..can i down size it to 100 mj..needs feedback opinion...thank you..
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Post by UniqueSP on Feb 20, 2014 15:26:45 GMT -5
Yes you can down jet to any number you want. Most oko carbuetors come with really high number jets. but make sure you dont run lean.
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Post by chamisataza on Feb 20, 2014 20:43:43 GMT -5
what is the perfect size for 21oko carb main jet ?with a 72cc polini contesta..
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Post by UniqueSP on Feb 21, 2014 15:38:48 GMT -5
what is the perfect size for 21oko carb main jet ?with a 72cc polini contesta.. That i do not know. I am not familiar with those smaller engines. I only work with GY6 150cc engines so hopefully someone can help you out with that here. but just a heads up a stock GY6 150cc scooter has a 105 main jet so my guess is you need something a lot lower than that. |
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Post by alleyoop on Feb 21, 2014 18:12:43 GMT -5
There is no set jetting, it is trial and error, no two identical motors will run the same so two identical motors may take different size jets and setting. But for a 72cc BBK something in the order of a #80 main jet.
Alleyoop
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Post by chamisataza on Feb 24, 2014 22:12:53 GMT -5
thank you for responding my order just arrived #100mj hex style i will put it tomorrow i hope it will run good and lower my gas consumption..thank you..
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Post by alleyoop on Feb 27, 2014 14:39:41 GMT -5
Lower your MPG with a #100, did you get up on the wrong side of the bed or what !!! You ordered the wrong size my friend, you do not have a 100cc BIG BORE KIT in it you only have a 72cc BBK, You will flood the poor little thing. But you will find out, seems nobody listens anymore people ask for advice and for some ungodly reason go and do a 180 right off the charts.  Alleyoop |
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Post by skuttadawg on Feb 28, 2014 0:28:10 GMT -5
I ran a 120 MJ on my 2T with a 47mm or 70cc BBK but I also had a Uni and racing pipe and a 19mm carb . Having a larger carb you get more air this need a larger jet than with a 19mm . Is this a 2T or 4T ? Mine became Pacman on gas compared to 50cc with a 75MJ . Here is some jetting tips jetting |
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Post by UniqueSP on Feb 28, 2014 14:08:43 GMT -5
Almost all OKO carburetors come with main jets that are way to high for what they are intended. Like for the GY6 150cc a 30mm carb has a 138 main jet. Which is way too high.
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Post by alleyoop on Feb 28, 2014 16:01:05 GMT -5
And try tuning a stock 150 with a 30mm carb. Most folks do not know how a motor works, a given motor can only take in so much air and fuel, you go past that point and you have a dog on your hands with a lot less power, on the flip side if you go the other way not enough of either air or fuel and you most likely will have a blown motor.
Alleyoop
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Post by chamisataza on Feb 28, 2014 20:45:00 GMT -5
Nop it did not flood on my spark plug its little bit tannish its a 2 stroke..i cover my uni air filter w/ a plastic cup that the Chinese food use.and it runs good i drove it this morning w/a 29F degree .it still eating lot of gas...i never try a big jetting bigger than 103 i don't what will happen my pilot jets is 42..
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Post by alleyoop on Feb 28, 2014 21:16:47 GMT -5
Some of us were born late but not yesterday  Alleyoop |
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Post by geo49 on Mar 1, 2014 21:02:55 GMT -5
If you want better gas mileage you should use the stock carb. and up-jet it a little and uni-filter.
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Post by chamisataza on Mar 10, 2014 6:34:23 GMT -5
your right geo49,i already did that..before maybe i am just not use to seeing my gas gage abruptly subside..i think there is pros and cons if you want fast scooter...even 100mj still eat a lot of gas just like 103mj because i have big carb bigger than stock..that needs more air..but i am just satisfied the way my scoot runnnn...i might change my mj to 103mj again this summer....
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..BAD TO THE BONE..
