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Here's a thought. You put the bike in neutral and the output shaft kept turning because it's locked to the rear wheel basically. When you put the bike in neutral (which basically means disconnecting the input shaft from the output shaft) and let go of the clutch (locking the input shaft of the transmission to the... lets just say crankshaft, ignoring the fact that there's a primary reduction gear in there) the input shaft slowed down to match the idle speed of the engine. Now your input and output shafts are turning at pretty different speeds, then you pull in the clutch lever and shift into second, and in an instant the input shaft has to speed up to match the speed of the output shaft... hence the grinding and noise as the dog teeth slammed against each other.
In order for revving the engine (rev matching) to work, you'd need to rev it back to about the RPM you'd be turning at 50mph in 2nd gear BEFORE pulling in the clutch level to bring the input shaft speed closer to the speed of the output shaft... THEN pull the clutch in, put it in gear and let the clutch out.
In a car this wouldn't be a problem because they use syncronizers to bring the two shafts to the same speed gradually before fully mechanically engaging... motorcycle transmissions don't because they're sequential transmissions so getting the input and output shafts turning at drastically different speeds is very uncommon. (though you certainly found a way to do it, hehe)
Last edited by KawaJAG : 07-01-2009 at 10:55 PM.
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