A CNS48 Hack
At least some NT carb parts will interchange into the CNS48 carburetor.
Though it is the same length and configuration, the NT slide is a smaller diameter. The CNS48 slide measures .625 inches, and the NT slide measures
.5015 inches in diameter. They will not interchange. The slide cut-away angle is quite similar on both of them.
The needles for low/mid-range are different also, but they WILL interchange.
The NT needle is longer by 2mm, and has 4 e-clip grooves, though the base
measurement is identical.
The CNS48 uses 5 e-clip grooves, one of which is lower than #4 on the NT.
CNS base @20mm @25mm @30mm (measurement down, from top of needle)
.075 .070 .069 .062 (these measurements in inches)
NT .075 .073 .065 .063 (as above)
Following another prior experiment with the CNS, I have installed an NT needle in my CNS48 and it performs well.
Perhaps an improvement, yet nothing notable. (My motor has other issues.)
It appears, the particular NT needle I tested, should run a bit leaner at both the beginning, and end of it's control range, especially considering it is 2mm longer. It would be richer in the middle of it's control range.
I have not yet tried the CNS48 needle in an NT carb.
I have also not compared these needles to other NT and CNS parts.
(Sry for mixing SAE and metric measurements.)
rc
At least some NT carb parts will interchange into the CNS48 carburetor.
Though it is the same length and configuration, the NT slide is a smaller diameter. The CNS48 slide measures .625 inches, and the NT slide measures
.5015 inches in diameter. They will not interchange. The slide cut-away angle is quite similar on both of them.
The needles for low/mid-range are different also, but they WILL interchange.
The NT needle is longer by 2mm, and has 4 e-clip grooves, though the base
measurement is identical.
The CNS48 uses 5 e-clip grooves, one of which is lower than #4 on the NT.
CNS base @20mm @25mm @30mm (measurement down, from top of needle)
.075 .070 .069 .062 (these measurements in inches)
NT .075 .073 .065 .063 (as above)
Following another prior experiment with the CNS, I have installed an NT needle in my CNS48 and it performs well.
Perhaps an improvement, yet nothing notable. (My motor has other issues.)
It appears, the particular NT needle I tested, should run a bit leaner at both the beginning, and end of it's control range, especially considering it is 2mm longer. It would be richer in the middle of it's control range.
I have not yet tried the CNS48 needle in an NT carb.
I have also not compared these needles to other NT and CNS parts.
(Sry for mixing SAE and metric measurements.)
rc
