Honda CB125

One of a kind Honda CB125 turned cb250. Originally the Honda CB125 came out with a 122cc engine made by honda from, (1973-1985 in the US). It had a single-cylinder overhead camshaft (OHC) engine with a 9500 rpm redline.

The “S” model was produced from 1971 to 1975 and was replaced in 1976 by the “J” model (the US bikes retained the S designation). The newer model sported a two piece head, 124 cc (7.6 cu in) displacement and a larger carburettor. Aside from different color schemes and minor lettering differences, these are some of the major design changes:

  • 1973 – First year the bike was released in the US as CB125S0.
  • UK model CB125S with tachometer and exhaust with trumpet end.

With the stock 125cc engine on this build needing a full rebuild and a conversation with the owner about the cost of rebuilding the stock motor and the time involved in sourcing the new parts then rebuilding the stock motor we come to the conclusion that it would be cheaper and a much better option for highway riding to remove the stock motor all together and upgrade it with a brand new Zonchen 250cc motor.

These motors are a quarter of the price also coming with a new wiring harness, new carby new exhaust all ready to bolt in and ride and if anything ever failed the owner could replace the motor with a new one 3 times over for the cost of rebuilding the stock motor.

The bike came in with multiple boxes of loose and rusted out parts. After sorting through all the parts we ordered all new parts, restored all parts that we could not get new, and upgraded things like shocks with new high end YSS shock, upgraded the old cable drive speedometer with a modern digital Motogadget mini speedometer .

Every part of this bike was replaced for new or restored and to see the full build in detail you can jump on our YouTube channel to watch the build process from start to finish.