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Leno meets the nicest people on his bored-out Honda CB750

Jay Leno's Garage is back to its tried-and-true formula this week with Jay taking a close look at a seriously cool vehicle with a guest. This time he invites in Adam Gaspic from Gasser Custom to take a look at a highly customized 1975 Honda CB750.
The bike is really an amalgam of styles from different eras and various Honda parts. Its looks are inspired by '50s hot rods with its white-wall tires and satin, metallic fuel tank, but there is a little British café racer in there, as well. A digital instrument panel and LED turn signals lend an air of modernity to it, too. Mechanically, the bike rides on a modified '75 frame with the front and rear suspension from an '80s Honda. However, the pièce de résistance is its engine, bored out to 836cc with additional head work and a custom exhaust.
Once on the road, the bike really sings. It sounds just the way a classic Japanese motorcycle should with a mix of whine at high-revs with rumble down low. A cycle that mixes this many styles should probably be a mess, but this fuses it all together perfectly. Scroll down to take a look at this motorcycle mixing classic and modern in Jay Leno's Garage.

2015 Pikes Peak Hill Climb: Practice Day 1

Based on what we learned from the first day of practice for the 2015 Pikes Peak International Hill Climb, the quickest race pace up the paved road to more than 14,000 feet above sea level may not be from internal combustion locomotion anymore. "If it all goes well, and the planets align, [under nine minutes] shouldn't be out of the question," said Paul Wilding, team manager for Nobuhiro "Monster" Tajima's Rimac Automobili Monster Sport E-Runner entry. Wilding added that if Tajima's car held up during the week it could finish first overall, which would be the first time an EV takes the overall crown at the hill climb. Last year, the gap between overall winner Romain Dumas' Norma M20 RD Limited and the fastest EV was just over two seconds. In the 2014 race, Tajima finished third in his class. "We think this car is the fastest way up now," said Wilding. "There's no affect from the altitude – this car is a monster, our driver is a monster." The practice, which isn't mandatory but is sanctioned by race officials, concluded Tuesday morning with a few surprises ahead of Sunday's race. Tajima will be racing for the fourth consecutive year in the all-electric modified division. Wilding said today's conditions weren't ideal and the race Sunday could be more challenging than initially expected. "It was a lot bumpier than we expected today," he said. "But today means nothing. It was all [reconnaissance]. Tomorrow means everything." The Honda ARX-04B LMP2 prototype brought to Pikes Peak had a difficult start to the week. Honda Racing spokesman Eric Mauck said the car struggled and didn't run in practice Tuesday. "We're looking for data and research more than anything else," Mauck said. "We're not going for Sebestain's record this year, we're just looking to gather information for years to come." Colorado-native, Honda driver, and Formula E racer Justin Wilson will pilot the LMP2 up the mountain Wednesday – assuming the car is ready. "He's obviously a guy that Honda thinks very highly of. Anytime we have an opportunity to put Justin behind the wheel of anything we want to," Mauck said. Honda driver Tetsuya Yamano, who is driving an all-electric Honda CR-Z in the exhibition class, echoed Mauck's assessment. "We're not making a racecar," Yamano said through an interpreter. "This is part of [research and development] and we're looking to get as much data back to engineers in Japan as possible ...

Honda patents engine with different cylinder displacements

A basic rule of engine design states that the displacement of a cylinder is equal to the engine's total displacement divided by its cylinder count. Honda, according to a recently surfaced Japanese patent, is looking to break that rule with an engine containing cylinders of different sizes. We've done our best to translate it from patent-ese. The idea is that different-sized combustion chambers give more flexibility when any combination of cylinders are deactivated, or rested. Because the different numbers can be combined in various ways, it provides more and smaller increments than would an engine with equal-displacement cylinders. Take a 2.0-liter four-cylinder, for example. Following the golden displacement rule, each of the four cylinders has a volume of 500 cc, giving displacement increments of 500 cc when any cylinder is deactivated. But suppose instead that the four cylinders displace 300, 425, 600, and 675 cc, respectively. This would give the engine 15 available displacements instead of just four, and the spacing between each option would be far less than 500cc. As a result, those different virtual displacements would provide more adjustment between power and efficiency than a cylinder-deactivation system can on a conventional engine. Honda's patent describes cylinders with equal bore size, with the displacement from cylinder to cylinder varying based on the crank throw radius – the longer the throw, the longer the stroke and the larger the displacement of that particular combustion chamber. The patent describes how the cylinder sizes would need to be arranged to spread the load on the crankshaft and presumably limit vibration that would be introduced by the different pulse magnitudes. If we're interpreting things correctly, the largest cylinder (the one with the longest crank throw radius) sits in the middle of the bank with the smaller ones alternating on either side as they decrease in displacement. This concept is described for multi-cylinder inline and V-type engines of various sizes. The patent was filed in March of 2014 and published in January of this year. Whether or not this arrangement will reach production is of course unknown, but the advantages in terms of both efficiency and power seem promising. Related Video: News Source: Japan Patent Office via Auto Guide Green Honda Fuel Efficiency Technology patent