THESE ARE SOLD EACH AND WILL NOT FIT THE STOCK HONDA CARBS. THEY ARE FOR THE 20MM AND 22MM MIKUNI CARB'S WE SELL AS A REPLACEMENT CARB. THE SIZE OF JET WILL VARY WITH THE CONDITION, SIZE AND PERFORMANCE ADDITIONS TO THE ENGINE. MOST STOCK 70'S WILL BE AROUND A 130 AND STOCK 90'S AROUND 140. THE CARB COMES FROM THE FACTORY WITH AN 180 MAIN JET SO MOST OF THE TIME YOU WILL NEED A SMALLER JET. ALSO WE HAVE FOUND THAT THE 22.5 IDLE JET WILL WORK IN 90% OF THE APPLICATIONS. MIK/JETPICK_THE_SIZE_OF_JET: 85_J400990_J401095_J4011100_J4012110_J4013120_J4014130_J4015140_J4016150_J4017160_J4018170_J4019180_J4020190_J4021200_J4022210_J4023220_J4024230_J4025240_J4026250_J4027260_J4028270_J4029280_J4030290_J4031300_J4032310_J4033320_J4034330_J4035340_J4036350_J4037360_J4038370_J4039380_J4040390_J4041400_J4042410_J4043420_J4044430_J4045440_J4046450_J4047