Gearbox Seal

Well i have had a problem with the scooter it had never run great and after i ran it in the problem got worse. I tried a new petrol tap and petrol pipe, then a new cdi unit, and lastly i even put the standed carb back on!. You see the problem was very odd the scooter would start up fine and run nice until i'd give it some stick then it would start to stutter and it would run like a bag off shit with no tickover you would then ride a bit more slower and it would run fine?. when it ran like shit it felt like a seal had gone but i couldn't work out why it would fix itself. So i decided it strip it down and have a look and look what i found
it looks like the seal had popped out on to the side of the crank but was still making a seal when there was low bottom end compretion. The seal had come from sip and felt a bit soft on the edge, this type of seal is right for the year of the scooter but you can fit the newer steel seal according to my mate(Thank Gillie). All you have to do is clean were the seal sits then apply some locktite on the edge of the seal and also where it sits then knock it in and lastly punch three marks to lock it in place. Now the scooter runs sweet, i have just got 70mph in third, on a good day and if my diet go's well (i'm a bit of a homer simpson) it shoud be good for 85+