this post was submitted on 29 Mar 2026
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The bike, an old Chiang Jiang CJ750, belonging to a good friend of mine needed some work. It was down on power, hard to start and had some electrical gremlins. I made a new wiringharness as the old wires were pinched and grounding out all sorts of places and gave it a new starter relay, the old one were only rated for 6 volts and would stick on from time to time. The carbs got cleaned and the valves adjusted. Now it runs like a champ and starts better than most new cars.
We aren't too versed with Motorcycles let alone any engine (best we know is electric bikes lol) but we always had a soft spot for those old Chinese bikes in movies. Sending it to our friend who's way more versed with this stuff, she'll love it!
This engine looks surprisingly similar to my old BMW R80
Fun fact, the Chiang Jiang is a copy of the Russian Ural/IMZ motorcycle which again is a copy of the pre-ww2 BMW R71. They then developed their own OHV head (that is almost identical to BMWs OHV head) when the flathead became too underpowered and fuel inefficient.
What a great feeling resurrecting a machine! Great work