August 5, 201412 yr As oer title, my friend has just bought a jtx 270 contact to learn to ride with us, however the bike struggles to downchange, it runs up the gears perfectly but coming down it almost feels like your in first trying to change down, nothing there at all until you knock the gear lever up a little to hit neutral level it will down change any ideas would be greatly appreciated!
August 6, 201412 yr The rivet itself could be coming apart. Back in the `old ` engine, just take the clutch cover off and it is probably an easy fix. Also the shift shaft could be bent.
August 7, 201412 yr In that gearbox there was the shift pawl that pulls or pushes the shift drum. The shift drum has pins that protrude. There is a roller that pushes between the pins to ensure proper engagement. Both the pawl and the roller have springs to position them properly. These springs weaken with time, also there was an upgrade done to a stronger spring. It sounds like the spring on the roller may have broken. I would recommend changing both anyway. The parts are not expensive. Certainly check the items suggested by others because they are right in the immediate area of the springs. . You do have to remove the right side cover and the clutch and basket to have good access to these.
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