Variator sticking - Mobylette AV7

The Operative /
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Hi Folks,

I installed a new variator on a rebuilt AV7 motor in 60' Mobylette Tourisme. Rode it for about a month with no issues. Now the little bastard sticks in high-gear (the belt rides at the top of the pulley) and then actuates suddenly upon deceleration, causing the moped to lunge from the sudden motor braking.....

Near as I can tell, the "fork" in the black sliding pulley halve seems move slightly past the locating pins on the housing...and then hangs up until the deceleration suddenly forces it off the ends of the pins....abruptly sending the belt back down to the inside (as pictured).

Any suggestions?

Thanks,

T.O.

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