Performance Carb Jetting

[rwaterman00]

crassius is it just the 50cc that has a smaller hole then? my 66cc has a big rectangular opening

 

[rwaterman00]

crassius is actually correct what I meant . but yes the 2 intakes from carb to jug are different. I got the one in my kit which was welded steel and a round hole. which wasn't the same size as the rectangular hole on the cylinder ( when I matched the 2 the motor got a lot more power

 

[rwaterman00]

as well I noticed that the cnc shorty billet which is port matched at the motor connection is not as big inside diameter as the welded steel. that's actually why I choose to use the steel one and just Dremel it and port match it myself. lol I guess when they make this stuff they are not as concerned with performance as we are trying to build them.

 

[gary55]

Saying 32mm and 40mm are the same at the intake is too broad a stroke, and as you said the billets, well some but not all are also smaller. Since I run a 16/16 carb I, like you chose a 40mm steel intake and took the dremel to it. I really liked the cast intake but thtat 14.5mm intake made no since to me, and hogging it out leaves it pretty thin walled for cast.

 

[rwaterman00]

honestly I haven't seen a lot of the different motors and equipment I just have a 50cc and a 50cc for parts and a 66cc I just finished and a 66cc I helped a friend with. so I am a noob. I just watch a lot of you tube and try the stuff I learn

 

[crassius]

the steel seems larger inside, but it necks down quite a bit at the bend - perhaps a dyno might show a diff, but I've never noticed any just by riding