MY ZX50 O.E.M CARB TUNING

[thebatman]

    oouuutsiiiiidde the box.....  i have yet to get a kit.

[wordslinger]

..this is mines..

[thebatman]

the one on the right looks like the pricey one i think at provo.... a helluva kit you got going on....

[wordslinger]

...areomyst hooked me up with a good deal on these...

[thebatman]

ahhh...always good to know somebody high up...   i bet he is bad ass, sounds good anyway...  id like to watch in that shop some.

[wordslinger]

..yeah, me too..i got my eye on a S9....

[art]

 S9 would be nice need some info for that one   
  Bat if you find a bit a little larger than your hole the friction will spin the metal and heat it up to a point you can pull them out and  do the same thing. The outers are brittle though so got to be gentle or it can crack the plastic once you got them out you can do what you want with them. Just try to keep them balanced so they dont wobble when you re install

[lankeeyankee]

With carb jetting on CV carbs..

NEVER CHANGE THE pilot jet / PAJ leave it to stock.
Always start off with the main jet for the best top
Change your main jet till you have the highest top speed (GPS) test this on the same day and road.
Once you have your main jet set to the best top speed its needle and spring adjustment.
Now adjust your needle height. If your needle isnt notched for adjustment you can only adjust the needle with shims of .010 these are thin shims usually found with hobbyist in the RC field.
Once you have your needle set now adjust your spring for quick throttle response. Some and most will say to cut the spring DONT cut the spring rather use wire to hold coils of the spring together. Usually 4-6 coils being tied together will allow the slide to open faster for quicker throttle response.

[sidthesloth]

That is good info, I will try that with the GPX. I think this fellow was tuning a 2 stroke carb.

[art]

 I can confirm! Do not adjust the pilot! Had no benifit and now need to turn the air idle screw way too far out.. Like the spring idea. An added thought for you guys take the slack out of your throttle cable also so you can get every bit of the twist.

[lankeeyankee]

I can confirm! Do not adjust the pilot! Had no benifit and now need to turn the air idle screw way too far out.. Like the spring idea. An added thought for you guys take the slack out of your throttle cable also so you can get every bit of the twist.

You will notice a great increase in throttle response if you coil up the spring to where the slide opens quicker. I will take a piece of 18gauge wire, strip it to where I just have the copper strands, cut in length about 1" take about 3-4 strands. Coil up 5 rows and twist the wire to hold the coils together (shortening the spring) and do the same for the opposite side  so the spring is even.

[thebatman]

hey fellas, im not sure about a cv carb....i have a pa.    now i do wonder about this trick tho... no cutting the cable, just tie up the spring?    i did have one shim in once for my needle but didnt see any sort of difference(can shim). should i try 2??...

[sidthesloth]

No good batman, he was talking about a four stroke carb, using the vacuum slide, less tension on the spring, the slide opens quicker.

[thebatman]

POP!!..... there went that bubble 

[art]

   The point is get your main dialed first than play with the rest to fine tune your throttle response and what not.(This does apply to both) People would cut the return spring for the carb but theres no going back after that.
  Hey Bat I still got that carb for ya. I did tap the attomizer(needle holder) what ever it is. Jets will be different I'll send one that works with it. If it's a problem let me know. It was dialed for one of my peoples 50's at one time   don't remember what stage   but should be good. P.M. me If you want any other info or pieces for that parts people 50 2t (Belt) and I'll try to get it out this week. Been busy