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MXAction YZ310 Article


A quick look at the specifications of Thumper Racing’s Yamaha YZ310F makes it obvious that this isn’t your standard big-bore engine kit. Oh, don’t get us wrong, it starts out like all big-bore engine kits—with a desire to close the power gap between a 250cc four-stroke and its 450cc big brother. The hope of every big-bore project, the 2011 KTM 350SXF included, is to keep the light and nimble feel of a 250 while boosting the ponies. So, what makes the Thumper Racing YZ310F different? The devil is in the details.

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