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2009 Yamaha YZF-R1

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Episode 28 of the Two Enthusiasts Podcast starts with some recent news: the closure of Skully and the near-passage of California’s lane-splitting law.

The conversation about Skully quickly moves from the failed startup, to a broader conversation about helmet design and the progress of technology in this space. The show then turns to California’s lane-splitting law, and what it could mean for motorcyclists in states other than California.

Once the news items are out of the way, the show spends a bit of time talking about crankshaft design, namely what it means to have a “crossplane” crankshaft.

Further down the rabbit hole, this turns into a larger conversation about how engines make their power, and how that power is tuned for specific tasks. It’s a tough subject to do only via voice, but we think you’ll enjoy it.

As always, you can listen to the show via the embedded SoundCloud player, after the jump, or you can find the show on iTunes (please leave a review) or this RSS feed. Be sure to follow us on Facebook and Twitter as well. Enjoy the show!

Yamaha USA has announced that they will be recalling a combined 24,000 units of the 2012-2013 Yamaha Super Ténéré and 2009-2013 Yamaha YZF-R1 models, due to heat expansion in the headlight. The heat expansion could cause potential failure of the headlight, which would reduce visibility of the motorcycle to oncoming traffic and increasing the risk of a crash. According to the NHTSA, use of the headlight in the affected motorcycles may generate enough heat to cause arcing in the headlight bulb socket and the resulting heat could cause the headlight to melt and malfunction.

httpvh://www.youtube.com/watch?v=tojHoqp8WIQ

We’ve just learned that the 2009 Yamaha YZF-R1 that Valentino Rossi’s rode around the Mountain Course during the 2009 Isle of Man TT is up . With a list price of £25,000 ($39,482 according to today’s market rates), this might be the most expensive stock R1 we’ve ever come across, of course not many bikes can lay claim to riding over the historic race course at the hands of one of the greatest motorcycle racers of our time. With some special VR46 livery parts, and a certificate of authenticity from Yamaha UK, the R1 has only 181 miles on it, and is signed by The Doctor himself.