[rontheyank]

Hi, does anyone know what the jet sizes are for a 26mm oko carb for a 200 fantic (back kick)? I see that these are available online at a much lower price than else where.

[totalshell]

just buy the lot from the guy down south. he knows his stuff and the carb comes ready to ride.
makes the bike a bit smoother and a bit more go. more importantly its the best part of 30 years fresher than an original..

[Lee Harris]

soton man will do the lot with modded pilot circuit and the correct airbox adapter. You wont do it cheaper and it wont run right without the pilot circuit mod!
L

This post has been edited by Lee Harris: 03 January 2009 - 07:41 AM

[RogerRoger]

Pay the man in Southampton for the info, or do the development yourself. It is not that much extra.

[rontheyank]

Thanks Lee

[Woody]

Lee Harris, on Jan 2 2009, 02:49 PM, said:

You wont do it cheaper and it wont run right without the pilot circuit mod!
L

Does that relate to the OKO in general or just on a Fantic?

[Lee Harris]

oko in general

[Lee Harris]

RogerRoger, on Jan 2 2009, 06:43 PM, said:

Pay the man in Southampton for the info, or do the development yourself. It is not that much extra.

You are right there. I took the sizes ioff the post. By the time you buy a set of pilot and main jets, then needles and then make an adapter you can buy on already jetted and just bolt it on. It will be cheaper and better cos if you get the jets close, the opilot circuit still wont be right and you will get no fun out of it. Speak to Chris at classictrial and let him do it propoerly. it IS worth the small amount extra.

[Woody]

Lee Harris, on Jan 3 2009, 07:41 AM, said:

oko in general

Can't speak for Fantics but I have fitted a 26mm OKO to a 320 Majesty and it ran perfectly, started first kick, straight from the box, no mods or even adjustment of the pilot screw. It will stand on its back wheel from idle in 3rd gear and revs it nuts off so the carburation is working right from idle to full throttle. I've just put a 28mm OKO on another 320 (bought for a Bultaco) just to try it and got the same result. No adjustment, 3rd gear off idle and it's on the back wheel. That engine isn't yet run in yet so I can't say whether that carb revs right through.

I'm not saying one thing or another here and I may have been lucky that the jetting just suits a 320 Majesty, but from that experience the pilot circuit is working fine on those two carbs.

[Lee Harris]

frenchi has a 320 majesty which he cant get sorted for love nor money. hamisch, are you reading this?
L

[frenchie]

Oh Yes
The technical dept has already stepped into action, one will be winging its way to France Shortly.
Will we sort the majesty or will it go replaced with a Fantic

Will let you know.

[Rory]

I had some dealings with OKO. buy a box of jets and play around if you get it right let others know.
http://www.iol.ie/~l...ycle/trials.htm Regards R : )

[moleman]

For What it`s worth i bought a 28mm OKO for my 240 from a Scooter shop complete with a range of main jets (jets were around 80 pence each)

The carb was around £32ish iirc

It fit in the inlet rubber on my 240 no problem, but was way to big for the air filter boot,
but found that if you simply turn the air filter rubber round so the air filter end goes on the carb
it fitted perfectly... then the small end fitted inside the air filter box very snuggly, a smear of sillicone round the outside for peace of mind.
dead easy to take off and replace

after a bit of testing i ended up with these settings

Main 110
Pilot K39
Needle clip 2nd from top
Needle JJH
Air screw 1 ¾ out
Slide , cant find any reference mark , but it came with it

That was around 7 or 8 months ago and it`s been a vast improvment

BUT....

there was a couple of issues, the chinese (or wherever they come from) main jets are probably best decribed as "in the region of.." when it comes to actual sizing, i had a couple of keihin jets
that were the same size (in number and shape) as the copies but i could tell if i changed them that they were at least a size or two different from each other

And... the carb i got, turned out to be for an autolube and had an inlet on the engine side of the carb. if i blocked this off i could not get it to carburate absolutly cleanly at the very bottom
and if i left it open it would not quite tick over slow enough.

So.. i took a pipe from the auto lube and fed it into the back of the air box via an aquarium fitting and in-line i started placing some of the main jets left over and ended up with an 90 main jet in-line , there you go i have a metered air leak!

works a treat, perfect carburation from almost stall too flat out.

The moral of this tale is: If you are still reading this but scratching your head then go and buy one already sorted

If it makes sense, then give it a go, if you get one without an autolube then be prepared to modify the pilot circuit in some way, it looks like it`s going to be needed!