I have just fitted the 3.3 engine in my jato
I completed the break in procedure exactly the same as i did on the 2.5 engine but it wont change into 2nd gear
Im quite new to this so i need help!!

Well, you can lean out the low speed needle a bit or adjust the shift point. The manual shows you how to do both.

Leaning out the low speed needle wont help in the shifting. The only thing leaning out the low speed needle will do is help it accelerate faster until the engines rpm hit just below mid range and that it the rest is up to the high speed needle. I would try leaning out the high speed needle. If the engine is overly rich on the top end then the engine will not get to the speed that is required to get it to shift. Or you could try adjusting the shift points. Just check in the owners manualy to see what you have to do. But just try leaning out the high speed first then go for the shift points