Which umbrella do you prefer ?

39 Phillip Island Australia 2011 MotoGP
7 Sepang Circuit Malaysia 2009 MotoGP
7 Indianapolis 2008 MotoGP
11 Catalunya 2008 MotoGP
17 Estoril Circuit Portugal 2007 MotoGP
13 Misano Circuit San Marino 2007 MotoGP
12 Laguna Seca United States 2007 MotoGP
31 Losail Circuit Qatar 2007 MotoGP
5 Sachsenring Germany 2006 MotoGP
16 Donington Park Great Britain 2006 MotoGP
36 Nelson Piquet Rio 2004 MotoGP
34 Mugello Italy 2004 MotoGP
32 Nelson Piquet Rio 2003 MotoGP
10 Catalunya 2003 MotoGP
37 Phakisa South Africa 2003 MotoGP
22 Sepang Circuit Malaysia 2002 MotoGP
7 Sachsenring Germany 2002 MotoGP
30 Assen Netherlands 2002 MotoGP
30 Catalunya 2002 MotoGP
15 Jerez Spain 2002 MotoGP
3 Phillip Island Australia 2012 MotoGP
2 Sepang Circuit Malaysia 2012 MotoGP
11 Motegi Japan 2012 MotoGP
4 Aragon 2012 MotoGP
 

ASK KEVIN: Do Motorcycle Engines Use Knock Sensors?

ASK KEVIN: Do Motorcycle Engines Use Knock Sensors?

QUESTION: There's a warning sticker on the Kawasaki Concours C14: "Use minimum of 90-plus octane gasoline to prevent severe engine damage." Are knock sensors (of any type) impracticable on a motorcycle engine? Robert Bodenhamer Woodstock, GA ANSWER: Yes indeed, detonation sensors can be and are...

Published on July 16 2015, 15:29
Source: www.cycleworld.com
 

Question: Do two-strokes engines work better when they run leaded gas? And if so, why? TYLER CAREY CYCLEWORLD.COM Answer: All spark-ignition gasoline engines are limited in the compression ratio they can use by the onset of engine knock, or detonation. In racing, it has for 80 years been normal... 

Question: Why do we use a given valve in a four-stroke engine as either an intake or exhaust valve? Why not use a valve for both intake and exhaust, then add some sort of switch to channel the gasses in the direction of either the intake or exhaust tract? Jeffrey Haasch Kirkland, Washington... 

QUESTION: Why do air-cooled motors generate more emissions than water-cooled ones? Why can't they just engineer cooler and cleaner air-cooled engines to meet the new emissions regulations? Silas B. Laubmann Atlanta, GA ANSWER: Differences between air- and water-cooled engines have been with us a... 

QUESTION: I can't understand why no one has produced a diesel motorcycle (besides military) and made it available to the public. Seems like the BMW R1200GS would be the perfect platform for such a bike. The benefits are many, especially when diesel is the most available petro in the world for... 

QUESTION: Why does Harley-Davidson insist on using a cam chain in the Twin Cam 103? With all the problems HD has had with jammed oil pumps, one would think they would have moved to geared cams, as in the Evo engine. Is there any advantage to a cam chain? I would buy an Ultra Glide if it would... 

QUESTION: Why doesn't every modern street motorcycle come with hydraulic valve lifters? Cheaper maintenance, engine always in tune, and no more praying that the tech knows what he's doing. Larry Newton CycleWorld.com ANSWER: If there was substantial demand for this feature, motorcycle makers... 

QUESTION: Why are motorcycle manufacturers not making more gears for motorcycles? Cars have gone from six speeds to eight and 10 for better acceleration and fuel economy. For example, a Kawasaki ZX10 has six gears. First gear goes to 100 mph, which means the bike runs like crap 10-15 mph because...