Japanese firm Bun Freestyle has released a new set of crankcases for Yamaha engines. These ones are reinforced in particular places in order to be able to accept further modification to the inner side to accommodate stroker cranks. The picture illustrates the modified crankcases compared to the stock ones. Two times Fumikazu Watanabe used to reinforce the stock crankcases by adding a sub plate underneath. Though, due to the new regulations new crankcases are allowed to be used.
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>Bun Freestyle crankcases
















