There is a possibility of under/over shift with the street bike linkage and lever system inside the clutch cover. This was also a possibility in the larger Enduro's, and it stems from the shift stop pin in the center of the shift stop slot on the bottom of the lever inside the trans either being slightly bent, or, not centered in the slot.
A solution was effected on large F series shifters along the way, and transferred by word of mouth back in the day. The stock early stop pins were simply a dowel with threads on one end, and a screwdriver slot in the other. They literally had a nut added to the threads, and were inserted into the lower case, and did two functions, stopped the lever from over shifting, and, held the lever in the center position when at rest. IF any portion of the setup was not correct, shifting could be adversely affected.
The "F9" stop pin was changed to one that had an eccentric end, to add adjust-ability to the centering of the shift lever, so, say, if the hairpin spring didn't let the lever sit dead square in the slot, that pin center in the slot was adjustable to return center to the lever, so the shifting was correct. MOST of the levers that didn't sit centered were offset by the hairpin spring not holding the lever centered. The F9 pin allowed slight adjustment to the spring, to center the lever in the slot.
Over the years, Kawasaki adopted a different shifting setup on some engines, which used an "under and over" lever set. the bottom lever that moved the shift drum was the same as the single lever styles, but the setups used an upper lever that had stop detents in them, to stop the drum from over shifting. The upper claw detents contacted the pins in the end of the shift drum, to positive stop the lever from turning the drum past gear stop, per gear, both directions. This type shift "claw set" was first used on H1R and H2R race shifting systems, to help stop missed shifts in racing situations.
EVERY engine I can fit them to, gets the upgraded "F9" eccentric adjustable stop pin, and I sure would like to see a modified double claw shifting lever for all our engines as well.
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