Identifying Attex year

[Attex Owner]

Hello all, a couple of years ago I got an old Attex, with enough spare parts for a whole second machine. The one that came put together has a 300CC rotax one lung engine, witha t5000 transmission. Does anyone know the model? Because it has a post T20 trannny, it limets the models down to I think 1968 and 1969. Also what is more recent/better t5000 or t7000? I would appreciate anything that anyone can share with me. Also I am having trouble with the clutch, the belt pops out of it, does that mean the spring is too tight or something?

[LarryW]

Hello attex owner,
You own a attex st300d. The 5000 series atv manufacturing aka Baker hill trans are the weakest one with a smaller main shaft. The 7000 is larger. The 6000 is a straight shaft non reverse model. 1st gen machine go untile 1970 I believe. 72 for sure are T-20 and think the '71 is also.