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I know the last factory upgrade was the 865cc big bore version. That gave the torque a little boost at low RPM. I think the next step would be to increase the stroke enough for 17cc per cylinder. The additional 34cc would make the twin displace 899cc. I think that along with some breathing tweaks could liven up the Bonneville. The 865cc could then be the standard motor with the 899cc the top model. This seems like a logical evolution of this power plant.
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