Jumping out of 3rd gear on a 250 Venox is a design fault. The prongs (3 of them) on the sliding gear that hook into the slots in the fixed gear giving you 3rd gear ratio, are 2.5mm (two point five) too short. The only possible solution is to make them longer. I did just that, making very sure shut all three prongs touch and transfer power when in gear after allembly, that is crucial. I did that mod 15000km ago and had no problems. Watch out for a hidden bolt under one of the timing chain tensioner/slider when splitting the box.
Its a problem of gear box.....
once service ur gear box and keep cleanin it every time.......
check for oiling
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