I bought this kit for my 2007 Honda CD50. I didn't put it on myself, but my mechanic finished the job in about 4 hours. Everything fit the bike perfectly with no problem. The performance is much improved, and the power was greatly increased. If you want a higher maximum speed though you will need to change your sprockets too. With just this kit my power was strong, and I went from 13 teeth front and 42 teeth rear to 16 teeth front and 35 teeth rear. This gave me an increase speed from 40 km/h to 60 km/h and maybe even higher if I push it. The kick start is harder with this kit, but easy once you get used to it. The carburetor is Chinese, but worked well with no problems so far. I recommend this product and quality.
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