The warranty is 60 days from the date purchased. But they do have some leeway especially if it is a small inexpensive part.
Try contacting www.customRCcars.com
They probably have an exploded view of the engine/carb and could tell you if the part is available separatley or not. I can't find an exploded view anywhere for the engin/carb. and without a part number finding it would be almost impossible.

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rolland

Here is another possible inexpensive solution.
http://cgi.ebay.com/CEN-GENESIS-46-C...QQcmdZViewItem