These high quality replacement jets are exactly what's needed to get your old bike running and idling smoothly.  They are manufactured in Japan to high tolerances guaranteeing and exact fit and proper function every time. 

The 99101-187 type jets from Keihin are original equipment on the many Honda 50cc motorcycles and scooters.  Check the dimensions below to verify these are the correct replacements.  Please inquire if you are unsure of the fitment for your model. 

Some but not all of the applications are as follows:

• Z50R motorcycles
• CRF50F dirtbikes
• NU50 scooters
• SE50 scooters

Length, overall = 8.5mm
Main body diameter = 5.86mm
Thread diameter = M6 x 0.75mm
Tip diameter = 4.8mm