Jetting 28mm pwk 160cc yx

[Jonte]

Hello!

Can someone give me some baseline jetting for 28mm pwk carb. I think that 100 main and 38 pilot would be good, what do you guys think?

I have 160cc yx with tb v2 head.

 

[my67xr]

Is it a genuine Oko?
If so, then yeah i'd go with a 38 pilot jet and 102 main jet.
tune it and try it out, then you may possibly need a bigger jet in the main

 

[Jonte]

No it's not a genuine oko.

Okay thanks.

 

[my67xr]

Have a read through this thread, it may help you get rid of some of the OKO copy issues
http://www.miniriders.com/carby-and-tuning/26815-keihin-pwk-copy-carb-mods.html

 

[chris.bedford]

I run a kehin pwk28 with 38 and 112 main, clip in the center on a stock 160.

 

[Jonte]

I checked my carb and it already have those "mods". I think that it is some better copy.

I noticed that my needle was damaged so what needle should i buy? Would this be good?
https://www.ooracing.com/store/needle-oko-ysn-pwk-style.html

 

[my67xr]

Yeah i guess if the measurement's are the same then go for it.
You can get a complete rebuild kit cheap for them too
http://www.ebay.com/itm/OKO-SERVICE-KIT-for-PWK-FLATSLIDE-CARB-CARBURETTOR-28mm-/400610531464

 

[thomasedwardblick90]

I run a kehin pwk28 with 38 and 112 main, clip in the center on a stock 160.

Is your exhaust completely open? No baffles? I believe my exhaust is almost 40mm