confused should i go with an OKO 26mm or 28mm?

[zeus17]

hi,


so i am planning to buy a new carb for my bike and i am confused with what i am trying to do

should i go with a 26mm oko d flatside carb or a 28mm version?

i read that i can go with a 28mm since oko carbs are known for using huges jets and stuff,,
i think i can go with a 35 slow and 110 main jet what do you guys think?

planning to install a short pipe after a couple of weeks

150cc zongshen bike,no mods whatsoever

 

[stoozo]

Ive got a 26 mikuni on my zonger 160, its a really good match up(havnt needed anything new yet as its my trails/enduro bike so I like it a bit nippy)....assuming its the same motor as my zonger. Id go the 26mm flat slide oko over the 28 unless you're planning on doing any engine work??!! Should be pretty much a perfect match up for that motor at 26mm. Not sure what jets im running exactly but it sounds pretty close maybe up the pilot to the next size up, im not entirely sure....someone who actually knows will reply later....its pretty early in Australia atm :thumbup:

 

[stoozo]

Oh and have a look at this too.... :thumbup: its like an oko guide with jets and motor match ups etc!!

those-about-to-rock-buying-oko-flatslides

Welcome to miniriders also....dont forget to introduce yourselfand start discovering what an amazing resource miniriders is :grinning-smiley-003

 

[zeus17]

Oh and have a look at this too.... :thumbup: its like an oko guide with jets and motor match ups etc!!

those-about-to-rock-buying-oko-flatslides

Welcome to miniriders also....dont forget to introduce yourselfand start discovering what an amazing resource miniriders is :grinning-smiley-003

thanks mate, i can relate to that early morning thing..its about 5am from where i am

yup ive read that link,

still confused..

cause a lot of buddies here are recommending the 28mm...
just a bit confused...

no engine work as of the moment...just an exhaust later on

 

[my67xr]

it's 6.47am here,

i'd also go for the OKO 26mm, i have one on my Lifan 150.
with the jetting you'll probably want a 38 Pilot jet, the standard 36 is too small.
mains could need anything from the standard 100, up to a 110.

what sort of riding do you do the most of ?


cheers, craig

 

[zeus17]

it's 6.47am here,

i'd also go for the OKO 26mm, i have one on my Lifan 150.
with the jetting you'll probably want a 38 Pilot jet, the standard 36 is too small.
mains could need anything from the standard 100, up to a 110.

what sort of riding do you do the most of ?


cheers, craig

my bike zongshen 150cc not sure if it makes sense isnt the push rod type,has a timing chain on it...

stock carb is 27mm,rejetted to (forgot the slow jet)but a 109 main jet...
so its a size down or up from stock...

with a 16t 36t combination

well mostly city riding on weekdays,,
but on weekend is mountain passes,on and off road combinations..
and a bit of track...
so a bit of all around riding i guess...

only reason i will be replacing the carb is because well,i just want a reliable and effiecient one...compared to the stock bike any after effects will just be a bonus

 

[my67xr]

ok, so it's an upright engine ?
something like this- a 162FMJ

 

[zeus17]

yup,does that make a difference ?
but yeah

 

[zeus17]

and lets say i get the 28 for dumb reasons is there like generic jetting combination for a 150cc bike?
same thing on the 26mm just in case i screw things up?

 

[my67xr]

i think the OKO 26mm would be better on the 150, it will give it a lot more off the line, quicker response

but the OKO 28mm would give you a better top end power though.
the standard jetting in both of them should be fine to be able to start and run it, they'll just need some minor adjustments on the mixture screw.
and if either has a slight hesitation when you blip rev the throttle a #38 pilot jet will help
you might even be able to find a cheap main jet kit locally i see them on ebay china for around $18 for 10 jets including postage

remember to get the genuine oko too, the one made in Taiwan.
and a decent quality foam air filter to suit, 48mm i/d

 

[zeus17]

i think the OKO 26mm would be better on the 150, it will give it a lot more off the line, quicker response

but the OKO 28mm would give you a better top end power though.
the standard jetting in both of them should be fine to be able to start and run it, they'll just need some minor adjustments on the mixture screw.
and if either has a slight hesitation when you blip rev the throttle a #38 pilot jet will help
you might even be able to find a cheap main jet kit locally i see them on ebay china for around $18 for 10 jets including postage

remember to get the genuine oko too, the one made in Taiwan.
and a decent quality foam air filter to suit, 48mm i/d

thanks for the tips here is what i am currently thinking about...

oko 28mm
mainjet 38
pilot jet will be 109 or 110 (close to what i have right now)
needle position middle clip...
needle size????

**might as well get the big one right?
will be adding a custom exhaust later on...

hoo do i know if its authentic????
here is what i plan to buy
the black one


Oko Pwk 26_ 28_ 30mm Big Carbs - Brand New For Sale Philippines - 42495891

 

[zwebx]

thanks for the tips here is what i am currently thinking about...

oko 28mm
mainjet 38
pilot jet will be 109 or 110 (close to what i have right now)
needle position middle clip...
needle size????

**might as well get the big one right?
will be adding a custom exhaust later on...

hoo do i know if its authentic????
here is what i plan to buy
the black one


Oko Pwk 26_ 28_ 30mm Big Carbs - Brand New For Sale Philippines - 42495891

"**might as well get the big one right?"
In my opinion no.
If your engine is going to be over carbed at a vital rpm range that you will be finding your self using more than 1k rpm from redline (you must use under that with these wide gearbox ratios) than i would recommend a medium grind cam, port and polish and a 26mm flatside that may just limit the top end power slightly but let it pull from almost idle nice and smoothly

 

[my67xr]

but the Verticals' 5 speed gearing is a bit better than the Horizontals' 4 speed,
and the bike comes with a 27mm carb standard too

 

[Blender]

For a 5 speed I think the 28 is the go, tuned right I don't think they'll be much difference down low compared to the 26.

 

[zeus17]

not sure if this makes sense and if it helps you in any way..

the bike came with a 27mm carb and the needle werent adjustable and with a 97 main jet..
a buddy had it rejetted to 109...and used a needle a thad bigger than the stock and were adjustable...


now if i switch to 28mm,
my hesitation on that is i saw previous post that 1 out of 5 28mm are non workable?
is that still true up to now?

and how do i know if the one i am buying is authentic?


and what jets i can buy since here you buy them individually
@$2/per piece but those are original keihin jets
will be going with previous advise to start tuning from

slow jet of 38
then kinda work my way from there..
main i think ill start with 110 since my current is 109...

5 speed ,1 down 4 up.
rev limit is 10k?

 

[my67xr]

what carby was on it? is it a keihin copy or a mikuni copy?

and the OKO, you need to look at the packaging, in the top r/h corner there needs to be a red square, not a sticker with a model on it.
this site has some good facts/advice on the OKO carbys too
Genuine OKO or Copy
OKO Tuning

 

[my67xr]

and what jets i can buy since here you buy them individually
@$2/per piece but those are original keihin jets
will be going with previous advise to start tuning from

sounds like you could source a supplier for some Keihin Jets for me then maybe ?
my local shop sells them for $12ea
do you have paypal ?

 

[zeus17]

sounds like you could source a supplier for some Keihin Jets for me then maybe ?
my local shop sells them for $12ea
do you have paypal ?

haha thats way too expensive! na i thought this was already expensive...
this is the guy selling the keihin jets..i can get them for you no worries,but ill send you the jets first before you send anything over click here
and the oko carbs.,i will getting the balck ones though will that even matter?

 

[my67xr]

not sure on the black ones.
maybe ask them what jets they take use, the round main jet or long hex jet
that might give us a clue

 

[zeus17]

not sure on the black ones.
maybe ask them what jets they take use, the round main jet or long hex jet
that might give us a clue

will the fake oko carbs take keihin jets?
since what i plan to do is after buying ill have them install the jets for me