cns carb adjustment?

GoldenMotor.com
bluenosegoat

bluenosegoat

New Member
Dec 29, 2009
259
0
0
arizona
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?
 
ex-28

ex-28

New Member
May 23, 2010
110
0
0
winnipeg, Manitoba
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 :)
 
A

Alson

New Member
May 16, 2010
71
0
0
Kankakee Illinois
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 knowdnut
 
K

klb6154

New Member
Jun 20, 2010
76
0
0
pittsburgh pa
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

bluenosegoat

New Member
Dec 29, 2009
259
0
0
arizona
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.
 
A

Alson

New Member
May 16, 2010
71
0
0
Kankakee Illinois
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:-||
 
You must log in or register to reply here.
Top Bottom