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thirdgenlxi -> RE: Unable to change gears at a stop (2/14/2008 6:41:28 PM)
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Yup yup... like everyone has mentioned already, completely normal.
Here's a little more in depth into as to why it won't shift into gear when stopped.
Unlike a car transmission, motorcycle transmissions are constant mesh NON syncronized. The gears have what's called "dogs" on one gear, and "grooves" on the mating gear. They act similar to syncronizers in that the end result is the same.... locking any given gear to the mainshaft or countershaft. But they're still quite different. When you shift to engage a gear, it moves the gear with the dogs, which is called a "slider gear", and moves it to either the left or right, depending on which gear you're engaging. The slider gears have splines on the center hole, which permanently attaches them to their respective countershaft or mainshaft. The grooved gears are freespinning on bearings. When you engage a gear and the slider gear moves over and meshes with the grooved gear, it then locks that gear to the respective countershaft or mainshaft, whichever it happens to be on. Once that gear is locked to the shaft, powerflow can be achieved.
Here's a few pics to help explain. These particular gears (in the first pic) are 2nd gear on the left, and 6th gear on the right. As you can see, 6th gear is the slider gear, and has "dogs" on both sides of it. 2nd gear has the "grooves", and is freespinning until it is locked to the shaft by 6th gear. If it slides one way it will engage 2nd gear, and when it slides the other way it will engage 3rd gear. Although these are 6th and 2nd gears, 1st works exactly the same. It uses 5th gear slider to engage 1st.
[image]http://i2.photobucket.com/albums/y15/thirdgenlxi/Misc%20Pics/DSC03768.jpg[/image]
[image]http://i2.photobucket.com/albums/y15/thirdgenlxi/Misc%20Pics/DSC03772.jpg[/image]
The dogs and grooves have to line up in order for the gears to mesh. This is why the gears have to be moving in order for them to mesh. When both gears are sitting still, if the dogs and grooves don't line up, the dogs will just bang against the non-grooved parts of the mating gear, making it unable to engage and lock that gear to the countershaft/mainshaft. The grooves are slightly wider than the dogs, allowing them to engage and disengage at speed, but also makes for some play in the drivetrain. This is why you get a slight "clunk" with each gearshift, and also why when the engine is off and bike is in gear, you can rock it back and forth several inches, and it feels real 'loose'. Just the dogs sliding back and forth a little bit inside the grooves. The shift fork rides in the little slot on the black gear, right between the actual gear part of it, and the dogs on the right side
[image]http://i2.photobucket.com/albums/y15/thirdgenlxi/Misc%20Pics/DSC03773.jpg[/image]
And when they're engaged
[image]http://i2.photobucket.com/albums/y15/thirdgenlxi/Misc%20Pics/DSC03774.jpg[/image]
I know that probably sounds really confusing.... I suck at trying to explain stuff [:@] But hopefully that gives you a general idea of how it works and why it won't go into 1st gear while you're stopped without rolling a little bit, or letting the clutch out first
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