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2007 Kawasaki Vulcan 2000 Classic LT (VN2000-F7F) -transmission skipping
Sounds like somethings bouncing around in there
 

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Your description is a bit vague. Does this happen in all gears? How many miles on the bike and how has it been ridden. Did this start as an occasional problem and get worse. Has the bike ever been dropped on the left side? At this point all I can do is give you what is by far the most common cause for what you describe. Worn gear engagement dogs and gear slots. You will never hear a motorcycle gear box grind, what you will hear is a rapid clacking sound. This is because motorcycle transmissions never slide one gears teeth over another. The gears are constantly meshed. Hard to describe without photos but here it goes. There is an input shaft, the one with the clutch, and an output shaft, the one with depending on final drive either a sprocket, a pulley or a bevel drive. Both shafts have gears on them. Both shafts are partially splined. All the gears are meshed but at any given time only one set is locked to both the input and output shaft and therefor transmitting power. At least one gear of the remaining gear sets is spinning free on a bushing.I am going to give the most basic description here and yes there are many clever ways to accomplish this basic concept. When you select a gear a sliding collar which is splined to the shaft but can move latterly has engagement dogs, little fingers, that slide into the free spinning gear thus locking it to the shaft so it can transmit power. These dogs either mesh with mirror dogs on the gear or slide into oval windows cut into the gear. All the torque produced is transmitted thru a small number of these dogs. They have a tremendous load applied to them. Over time thru normal wear, thru hard use, thru poor shifts or due to shift mechanism damage these dogs and windows become rounded. Once they start to round off they want to cam out. The more they pop out the faster they wear.
 
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