cns carb adjustment?

[bluenosegoat]

I recently put a cns carb on my mountain bikes 68.5cc engine with a sbp pipe and shift kit. I got the carb from spooky tooth and there are no instructions with it so I am a little confused as to what the adjustment screws do. I seem to be running rich but before I go messing with I would like to know what the adjustment screws adjust! The forward one (towards engine) I assume is higher rpm mixture while the rear screw is for idle? Anyone know for sure?

 

[LAboy]

I can't tune up this carb too.
Anyone can explain how to adjust this two screws? I know one is air other is rpm..

 

[ex-28]

the cns carb settings are as follows , and i have found to be the best setup

the bottom tube is overflow for have a tube on it running downward
the 2 tubes side by side , plug the left one and run a tube on the right one as a vent
the top one on the other side with the barbs on it run a tube on it as a vent

for the idle screws ,
left screw is your air/gas mixture (in is less air)
right screw is your idle speed (in is speeding it up.

hope this helps

 

[LAboy]

ok, will try it tonight. Thanks!

 

[Alson]

I cant get my ideal to stay put, if I have it to low it dies, so I put it up some then when I run it the ideal goes up by itself. If I stop to ajust it it lowers by itself, and if I leave it ifeal by itself it gues lower and lower till it dies, anybody know whats up with it, I made sure I didnt have any air leakes, but it seems like it, or does anybody know

 

[klb6154]

float may not be set at the right level draining the bowl then when you blip the throttle it gets filled again how dose it ride ? any flart spots in the rev range?

 

[bluenosegoat]

I had a similar problem with idle and it just turned out that my throttle cable was sticking a little bit every now and again! A little teflon on there and problem gone. I hope its that simple for you.

 

[Alson]

It could of been the float, cause the engine leans forward making the carb lean at 30to 40 degree angel. Any way I was runing it around 25 mph, then it diedl wated awhile started it again then it died again, had to ride it back home with no engine pull. I took it off, and put my stock carb on it