I brought an XL 2 weeks ago and have run nearly a galon through the engine. I have started leaning the engine out. I have turned the high speed needle around 5/8 of a turn. Went it revs up, it hesiates and then shifts to second then third. It is also very slow off the line and I have turned the low speed needle now 1/2 a turn. No wheelies at this stage. At this stage I haven't altered the 3 speed box as I wanted to get the engine running right. BTW - I live in Sydney and it's around 35 degrees celcius at the moment. I am sure this will effect the cars performance. Any feedback will help.