> I am putting a 70cc piston kit on my 2004 derbi atlantis. I
> cant afford the 19mm carb right now. I was wondering what
> jet size would work best. please help
>
There is no simple answer to "what jet works best". Every engine is different and environmental factors like temperature, altitude and humidity all factor in. I suggest you start with a #75 which should get you close and do a spark plug reading to see if it is too rich or lean. Go up or down on the jetting until you get the right fuel mixture. If you don't know how this is done, I would suggest having a reputable shop do it for you. Improper fuel mixture will cause engine damage.
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