Honda CB250: Carburetor Specs, History & Rebuild Guide

Overview

The Honda CB250 is a 249cc parallel-twin motorcycle produced by Honda (1968–2005).

Honda has made several different motorcycle designs with the designation CB250 , beginning with the Honda Dream CB250 in 1968. Other Honda CB250 models include: Honda CB250 (1968–73) Honda CB250 G5 (1974–1976) Honda CB250T Dream (1977–1978) Honda CB250N Super Dream (1979–1981) Honda CB250RS (1980–1984) Honda CB250 Nighthawk (1982–2008) Honda CB250F Jade (1991–1995), based on the 1991–1996 CBR250RR Honda CB250F, also known as the 250 Hornet, the replacement for the CB250F Jade

Engine & Carburetor

The Honda CB250 uses a 249cc parallel-twin engine. The stock carburetor is a Keihin unit.

CarbForge offers carburetor rebuild kits compatible with the Honda CB250. These kits include all necessary gaskets, jets, needle valves, and float assemblies to restore the original Keihin carburetor to factory performance without purchasing a complete replacement unit.

Compatibility & Fitment

CarbForge carburetor repair kits are compatible with the Honda CB250 (1968–2005). Coverage spans the main production run from 1968 through 2005. Always verify your model year and carburetor part number before ordering.

Carburetor Maintenance Tips

Regular carburetor maintenance keeps your motorcycle running efficiently:

1. Clean the jets — Remove and clean the main jet, pilot jet, and needle jet every 12,000 km or as needed.
2. Inspect the float — Check the float for fuel leakage; a waterlogged float causes rich running.
3. Replace the needle valve — A worn needle valve and seat causes fuel overflow and flooding.
4. Check the diaphragm (CV carburetors) — A cracked diaphragm causes poor throttle response.
5. Use a rebuild kit — When multiple seals and jets need replacement, a complete rebuild kit is more economical than sourcing parts individually.