Using 6th gear over drive correctly and vibration

[Tazzel]

I purchased an F3 and felt the vibration at 65+ right away. A friend of mine that knows engines and bikes in general hopped on and took it for a 20min ride. When he got back I asked him if he felt it too. He said he felt it but it was not the belt. He said you have to use the 6th gear correctly or your bogging the engine. He said push the 5th gear out to 70 to 75 before moving into 6th. 6th gear is an over drive and should only be used at higher speeds. When passing, or curising at higher speeds. Always drop it back into 5th gear when your speed drops back down to 65 if you dont and try to accelerate you will feel the vibration.

So I tried this over the next few days and problem was solved.