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Old 10-22-2009, 12:03 AM
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aaron joy
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1. Crankcases are the same for the "S" series. (S3,S5,S7)
I looked up the numbers on my RB dealer price list.

2. New "Hobby 9" head is lighter then the S5 L2G.

3. Not sure but it rips, great engine for the money!!!
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