kmx 125 vibrates in 4th gear

[sam_w]

when im riding in all other gears the bike is fine, but when im working my way through the revs in 4th gear the bike feels like it kinda grinds/vibrates until it hits powervalve and then its fine again. also its is sometimes hard to shift from neutral to 1st so i dont know wether its a clutch problem that might be causing the vibrations in 4th. can some please help? thanks in advance

[rotax81]

if it was the clutch then it will be in all gears.

it sounds like your 4th gear knackered to me.
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ZX636C6F road. ZX636C1H track. ZX7R redundant. ZX0.5R minimoto as ornament.
Audi A4 Avant 1.9TDi and VW Transporter 2.5TDi 888 Special (no mot and tax lol)

[sam_w]

ok thanks for your help m8. il put it in a shop and see what they say. does this mean il have to replace the whole gearbox or is there a possible fix for this?

[Odie]

easy, dont go into 4th!
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You are so ugly when you were born the doctor said "I?m gonna drop it, if it falls is a rat, if it flies is a bat."

[rotax81]