Is your old Honda XR100R running rough or not starting? A new carburetor might be the fix. This NICHE carburetor assembly is a complete, ready-to-install unit designed specifically for 1998-2000 model Honda XR100R dirt bikes. It directly replaces the OEM part number 16100-KN4-A10. It comes pre-set with a #90 main jet and a #35 pilot jet installed, and even includes spare jets (#95 main and #35 pilot) so you can fine-tune it if needed. It has a manual choke, and the input port size is 40mm with a 26mm output. NICHE makes quality aftermarket powersports parts that meet or exceed OEM standards. Installing a new carb can solve issues like poor idle, hesitation, or flooding. This is a much easier route than trying to rebuild a gummed-up old carb. Make sure your bike's model years match, and you'll be back on the trail in no time with smooth, reliable performance. A great, affordable upgrade for your trusty XR100.