I too own a CBR 150R. Experienced gear shifting problems myself. The 1st and 2nd gear on my feels pretty hard and some times the gears get stuck. I have to open the throttle a little and then the gear clicks in although this happens only sometimes specially during rapid downshifting after slowing down from high speeds.
Mentioned it to the mechanic during my bike's fourth service. I think he made some clutch adjustments and the gear shifting improved to a certain extent. I guess this is a flaw with the transaxle design of the bike.
P.S: I have got all the servicings done on time and got my chain and sprockets replaced as well during the fourth service.




(MRF, Gone fish tailing twice in 8 days)


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