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Motorized Bicycle Trouble Shooting Use this area to post problems that may arise, if you could use some help in figuring out what is wrong with your engine and what needs to be done to achieve top performance.

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Old 03-09-2013, 05:01 PM
hcrft hcrft is offline
Motorized Bicycle Member
Join Date: Jan 2013
Posts: 28
Default disappointed with my cns carb

my schwinn is destined to have a performance carb, boost bottle, nitrous, a tuned pipe , and shift kit. i decided to start with a cns carb. IT SUCKS. the only time the bike makes any real power is right before the engine runs out of fuel. otherwise, if the fuel valve on the tank is open, the engine is flooded, and bogs down when i open the throttle.if tried all the obvious combinations of needlevalve settings, fuel settings (from rich to lean), covering or uncovering the two tube ports on top of the carb, and the results have been different variations of the same going to go back to the stock carb, and if the jet in the cns carb is bigger than stock, i will swap them. SO DISAPPOINTED in the carb!!
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Old 03-09-2013, 05:45 PM
Bikeguy Joe Bikeguy Joe is offline
Godfather of Motorized Bicycles
Join Date: Jan 2008
Location: up north now
Posts: 11,531
Default Re: disappointed with my cns carb

Wait until you install the boost bottle...
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Old 03-09-2013, 08:32 PM
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maniac57 maniac57 is offline
Old, Fat, and still faster than you
Join Date: Oct 2011
Location: memphis Tn
Posts: 4,493
Default Re: disappointed with my cns carb

Yet another person who did not know what they were buying, just heard "FASTER!!!"
The CNS needs to be tuned to work right by someone with some understanding of exactly what a carb does and how adjustment changes things. You should read up on tuning these carbs here in the forum before you get mad. There is plenty of information if you take the time to learn and you will surely have much better results than just bolting stuff on and nailing the gas....
There is no such thing as a free lunch.
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Old 03-09-2013, 09:10 PM
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Greg58 Greg58 is offline
Motorized Bicycle Elite Member
Join Date: May 2011
Location: Newnan,Georgia U.S.A.
Posts: 2,672
Default Re: disappointed with my cns carb

The cns needs the float set correctly to compensate for the carb angle, if yours runs better right before it runs out of fuel try bending the float tang to close the needle sooner. As for the jets they are not the same thread size as the nt.
Your results may not be the same,Greg
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