i dont know if the rev 3 has a filter in the tank like the evo but mine blocked section 1 at a trial it would trickle through but as soon as the bowl and in line filter emptied it died might be worth a look
i agree with smalley250 but i would have thought the balance you have gained from your previous sport will serve you very well in trials i can recommend ryan youngs trials training dvd its very good
i know it has a clutch but the ty80 is a great bike my daughter loved hers she is now on a evo 80 great bike . Just come home from a trial a friends lad was on his beta 50 that thing gripped everywhere brilliant little bike