Hi, been trying to get me 1.3 started for the past few days but she just won't go, it will fire up a little bit but then cut up, it will occasionally back fire from both exhaust and carbs, it seems like the timing is off but I have it set to the stock specs, she is running a set of bike carbs and a 4-2-1 exhaust, last time I tried I set the timing left to the left go the Z mark and she sounded a lot better but then went back to the same as before.