cbr250's suffer from a loose rose joint mount on the gearshifter from new.
Put some thought into how to (carefully) weld it to get rid of the slop without destroying the rose joint (its part of the gear shifter)
-removed the gearlever,
-put a 6mm bolt into the threaded female end of the rose joint,
-pumped the rose joint full of grease with a syringe under its rubber cover,
-fully sealed it with insulation tape (yellow in the pic)so that the grease is not affected by quenching.
-wrapped it with aluminium heatproof 3M tape (silver in the pic),
-Cut a slot in a 12mm washer and slipped it behind to protect the rose joint as well,
-ground the lower 1/3 to prep it for the weld,
-quenched in water immediately after the (quick) grind.
-set up the MIG and had the water container ready and gave a nice neat quick weld,
-filed it smooth,
-painted with Satin black.
No more Slop.