We'll thats a hard question. Its a problem that ive heard of alot, making it a little bit common, but its not a problem you should just let go if that is what you are asking. It sounds like Synchros in your gearbox possibly. I suggest getting it looked at as it might result in you chipping teeth and sending shards of teeth into 3rd and/or other gears.

This then results in tears.

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Honda Hannspree Edition CBR 600 RR - SOLD
Yamaha FZ1N - Purchased