Q&A

HONDA C50

 I was asked to rebuild a Honda C50 for a friend: long story short, after I put it all together and started the motor I took it for a small test ride and discovered that first gear was clicking; the other two gears were fine. It changed up and down fine (it was a little stiff) but I thought this was down to the bike sitting idle in a shed for more than 10 years. I stripped the motor and split the casings, to discover that the big gear had a tooth broken. I couldn’t find any other damage by looking, so a friend gave me the gear and the shaft it was on from another age-related bike. This went back together fine and all the other gears looked perfect and the change forks also, so I thought it was sorted! However, after about four miles on a ride when the bike got