MY ZX50 O.E.M CARB TUNING

[thebatman]

what up? ok, lets see..wanna tune oem 14mm carb.. was looking in manual, in general info, it says carb needle in 1st notch, in carb ch., it says the std is 2nd notch?!? how do you know?.. the pilot jet CAN b removed, i dont think its supposed to tho.. i tried a jet recently (was a 90, i opened it up: idk what to). started fine, revved good: took off, slower, boggish, did have stock air box on also, didnt change any needle height  how do you know if i need to change?.. how do i know if i can use that jet?   can i "open up"/bore out the stock intake any?               what about any porting, etc. easily done?  i guess cyl, intake, exhaust,

[sidthesloth]

The service manual I have is 2000 and says the needle is adjustable but my scoot is a 2007 model and the needle is not adjustable, it is something they have changed somewhere along the way.

[wordslinger]

...my needle needed to be in the stock position for best reponse...

[zombie]

The needle only changes the 1/4-3/4 throttle mix. How does the new jet run at top end?

[wordslinger]

...my needle needed to be in the stock position for best reponse...

..same here...i tried hand-made mods, just because there was NO adjustment capabilities on my OEM...

...but stock position ever ruled...

[thebatman]

when i tried that jet, it sounded good sitting, but when i took off, it was boggish and slower so i didnt even take it down the rd wide open(did have stock box on). figured it wasnt right anyway  the manual contradicts itself on the needle deal  i need to look at mine again    dont seem to be able to change pilot jet on this carb either(just a brass rod)..

[wordslinger]

...if it's pretty much stock, then there is no need to f*** with the needle...

..have you verified the integrity of all of your vacuum tubing?

[thebatman]

right on.. do wonder why they say 2 diff. positions.     yeah, they is only one into the intake

[Shaka]

The needle is not adjustable on mine and the pilot jet doesn't seem to be removable.  They may use a different carb on newer models with those features.  I believe I have the same carb as you though.  Have you tried running without the air box on?  You may be bogging due to the jet being too large.  Try it without the air box and if it runs better, try an open air filter, or drilling some holes in the air box to let more air in.  If you haven't changed the intake or exhaust the carb should be fine with the stock 90 jet.  The only time you will need more fuel is if you are letting more air in/out!

[thebatman]

well crap   no i didnt try w/o box on.. am gettin an open filter( to get rid of the big,ugly oem box)      my cdi(unrestr), boss drive, clutch, springs, cvt , exhaust all is changed.. cage is next, just leaves intake,( if can be done to benefit stock jug), carb/work

[zombie]

Try like shaka said w/out the airbox. Just a trail run won't hurt it.

[thebatman]

went and looked at jetsrus for sum jets... the ones i saw dont look like my oem.. it said oem style, kiehin but they looked like a screw wit a head. my jet has no head. do they change or am i missing sumthin.  seen the numbers i want and only2.50$ apiece

[wordslinger]

..if you have some dial calipers...and you're gonna need them if you don't, ...you can physically measure the dimensions of your jet...

[zombie]

http://store.harryepstein.com/cp/Weldingsupplies/WTTC.html  Do one thing at a time my bro

[thebatman]

well i really dont know what imma do with that.. dam, they are $8 at this parts houss.. dude, im not as talented as you, i cant make my jets.. i was trying to find sum so i can get them.. sh**, i cant even get ONE thing done.. guess i know more than before BUUUT!! dont think imma risk the other, hadnt grasped the deal with it. need laymans terms, hands on, visuals.. no sense in destoying a perfectly good motor