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Try an Odessy elementry v3 stem weighs abput 290g.
Hoffmann LT
S & M Race lite
or this
http://www.k-124.co.uk/product.php?product_id=170&category_id=140
weighs in at 190g. Probably the lightest you'll find without there being a weight limit.
You could also look at Crupi.
Hope this helps!
As the title says. gonna try these on my sons bmx thats he's using for racing. Something cheap n cheerful please.