S10 jumping out of gear

[Offroadrider]

Hi everyone, just bought an S10 with a gear box problem, put into 5th and jumps into 6th, checked the WWW and phoned both Shimwell's and Yamaha South Africa, no one has ever had an issue that they know of, in fact Shimwell's have never even opened a S10 motor, has anyone here had or know of anyone who's had a problem before??

 

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