THIS HAS A 65 MAIN JET AND 35 IDLE JET THE MAIN JETS HAVE A DIFFERENT THREAD PITCH THAN THE OEM CARBS DO,, SO YOU MUST BUY THE ONES LISTED BELOW ON THIS PAGE THIS IS "NOT" THE SAME AS THE MAINLAND CHINA COPY THAT OTHERS ARE SELLING MOST ALL OF THE PARTS FROM THIS CARB ,, OTHER THAN THE JETS,, WILL REPLACE THE OEM CARB'S PARTS (I TRIED THEM) AND THE BLACK KNOBS DON'T FALL OFF LIKE THE CHEAP COPY'S DO ================================================== ***(ON MOST CT90 MODELS YOU MAY NEED TO MODIFY THE OVERFLOW OUTLET TUBE/HOSE) SEE PIC ABOVE Pull out the brass carb bowl drain nipple, cut off 5/16” and tap back into bowl leaving 3/16” stub to attach rubber drain hose. (thanks Greg F.) ================================================== S1215 @ OUR TAIWAN MADE ST90 ATC90 CT90 ATC70 CARBS MAIN JET PICK YOUR SIZE BDAY/MAIN/JETSPICK_SIZE_HERE: 60_J415162_J415265_J415368_J415470_J415572_J415675_J415778_J415880_J415985_J4160 @ CLICK ON PICTURE TO ENLARGE @ CLICK ON PICTURE TO ENLARGE @ RIGHT SIDE @ INSIDE STUFF @ CLICK ON PICTURE TO ENLARGE @ CLICK ON PICTURE TO ENLARGE @ CLICK ON PICTURE TO ENLARGE @ SAYS "PULL OVEP 6000 ft ALT" HIGH ALT. PLUNGER WITH KNOB THAT STAYS ATTACHED REPLACES 16037-077-004 (336E)TO MAKE IT MORE ORIGINAL LOOKING YOU WILL NEED TO INLAY SOME WHITE FUSION PAINT AND ADD A LEG TO THE P TO MAKE IT AN R (OH,_MY) COMES WITH ALL RUBBER PARTS, SPRINGS AND CLIPS 336E