Question about Yamaha XS 400 Motorcycles

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I have a 1979 Yamaha xs400 which has a 6 speed gearbox. But when trying to shift from 4th to 5th there is no gear it just feels like I've hit the top end. The 5th won't engage. I have a spare engine with transmission but i'd like to get an idea of whats wrong before opening the case. Thanks

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For some reason my first answer did not post. The problem is a bent shift fork or two. The forks move left and right to move slider gears to engage into other sets of gears. Don't expect to see the bend in a bent fork. A bent fork looks just like a good one. The bend is very slight. With the gearbox opened up you can manually shift through the gears to see the gear shifting patterns. Some shift patterns require two forks to achieve the shift. Some patterns require only one. You can look to see what yours requires. Below is a generic diagram of how the shift forks move slider gears. I have a 1979 Yamaha - tombones49_55.gif

Posted on Apr 05, 2011

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