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12 Assen Netherlands 2012 MotoGP
10 Silverstone Great Britain 2012 MotoGP
4 Motegi Japan 2011 MotoGP
29 Misano Circuit San Marino 2011 MotoGP
23 Misano Circuit San Marino 2011 MotoGP
12 Misano Circuit San Marino 2011 MotoGP
12 Mugello Italy 2011 MotoGP
35 Estoril Circuit Portugal 2011 MotoGP
30 Estoril Circuit Portugal 2011 MotoGP
8 Jerez Spain 2011 MotoGP
8 Phillip Island Australia 2010 MotoGP
15 Sepang Circuit Malaysia 2010 MotoGP
9 Misano Circuit San Marino 2010 MotoGP
26 Catalunya 2010 MotoGP
3 Assen Netherlands 2010 MotoGP
14 Mugello Italy 2010 MotoGP
9 Le Mans France 2010 MotoGP
36 Le Mans France 2010 MotoGP
10 Indianapolis 2010 MotoGP
1 Misano Circuit San Marino 2009 MotoGP
4 Misano Circuit San Marino 2009 MotoGP
18 Indianapolis 2009 MotoGP
12 Misano Circuit San Marino 2008 MotoGP
22 Estoril Circuit Portugal 2007 MotoGP
 

TECH ESSAY: Separate Gearbox Oil? If Yamaha's MotoGP team has started doing this, here are some possible reasons.

TECH ESSAY: Separate Gearbox Oil? If Yamaha's MotoGP team has started doing this, here are some possible reasons.

Seems I recently saw a notification that Yamaha has begun to lubricate its MotoGP gearboxes with something other than engine oil. If true, there could be a couple of reasons for this. In four-stroke motorcycle engines, it seems like a useful simplification to lube the gearbox with engine oil....

Published on September 17 2015, 16:18
Source: www.cycleworld.com
 

When I recently flew to California for the Cycle World Ten Best celebration, the car I rented rubbed my nose in two technologies currently little used in motorcycles—direct fuel injection (GDI, or Gasoline Direct Injection), and widely variable cam timing by means of hydraulic cam phasers. Cars... 

While it's true that many production motorcycles have over the years lubricated their gears by "splash" (that is, by filling the gearbox with oil up to the shaft centerlines or thereabouts), this method has drawbacks. The biggest is power loss through oil churning. Everyone who ran one of... 

When Yamaha designed its TZ750A engine more than 40 years ago, certain shortcuts were necessary to get it into production quickly. To avoid the problem of making a pressed-together crankshaft four cylinders wide, they built that engine with two separate 180-degree twin cranks that were closely... 

When I first started going to races, people were fond of the dramatic. Your bike didn't just stop running, it "blew up." Blow-ups were common. Unlike the present, production bikes were nowhere near being "raceable." To get something close to reliability, your bike had to be built by someone with... 

The various parts of an engine have differing lubrication needs. Gears, with their very high tooth-to-tooth loads, and cam-to-tappet friction, place the greatest loads on oil. Crankshaft main and connecting-rod bearings operate at moderate temperature, but the top piston rings and the exhaust... 

Featuring a version of the Revolution Max 1250cc v-twin first introduced in the Pan America 1250, the new Sportster S unveiled by Harley-Davidson today is a modern, high-tech interpretation of the Harley icon. About the only things familiar are the feet-forward ergonomics. With a claimed 121... 

Word is spreading like wildfire today about the new Honda RC213V-S, the street-legal MotoGP replica that will be sold as a 2016 model for a cool $184,000. Starting at 3:00 p.m. PST on July 12, reservations for this limited-production bike can be made only at the bike's official website:...