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The shift drum. If you don't know how it works then it would take too long to explain here. Anyway it basically consist of the two shift forks (in the photo, one vertical the other laying down to the right) which slip on to the shift drum. The drum has grooves which engages the "guide pin", there is one guide pin in each shift fork. When the drum turns the grooves move the guide pins which move the shift forks, get it? Anyway, worn guide pins will have too much clearance in the groove which means the forks will not move exactly the way they should. (the guide pins are small round metal pin in the center of the photo, held into the shift fork by a small metal clip) |
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A photo of an OLD worn out pin on the TOP. And a fresh NEW pin on the BOTTOM. The old pin measures 5.41 mm in diameter, the new pin measures 5.96 mm. A .55 mm difference, X 2 because you have two guide pins means about 1.10mm of unwanted clearance. Believe me, it makes a difference in the way the gearbox feels when you shift it. I cannot find factory specs for the pin diameter but I would say if you can feel a ridge like the one in the top of the photo then you should replace the pins. They are very cheap, about $1.50 US a piece. |