I own a 1981 Yamaha XJ650 Maxim that I have been riding for a number of years. Recently the shifter lever stopped springing back into the "neutral" or "middle" position between shifting. It would stay down after being pressed down and you would have to physically move the lever back up again to make the bike shift down again. This was caused by the shift return spring breaking. I'm writing this post to show others with this problem how to fix it. I was assisted in this project by one of the users on this site: Robert. Parts needed: SPRING W/ COLLAR: SKU: 99999-01179-00 OIL SEAL (SD 12-22-5 HS): SKU: 93102-12321-00 GASKET, COVER CASES: SKU: 4BB-15451-00-00 Instructions (Courtesy user Robert): The shift centralizing spring is located under the left cover, access is very straight forward. A new gasket and shifter seal should be obtained in advance as preventitive maintenance. You will need to remove the shifter (make sure you mark your shaft/lever alignment or you will make more work for yourself later. At this point I would lay the bike on it's right side if you don't want to do an oil change or have to top off from oil loss. Then remove all of the shifter cover bolts, keeping them in order from the holes they come out of. Remove the cover and have a rag ready to catch any oil that leaks out. You will see the shifting shaft assembly (forward assembly) and the shift lever assembly (the rearward assembly. Their alignment to each other is critical so mark them (if they aren't already, they might have dimples on their faces for this purpose). Pull the lever assembly out slowly, note that the shaft assembly has the centralizing spring on it and you should be mindful of how it is fitted and clocked (the spring most likely will be in pieces). Swap out the spring and reassemble the bike. Stand her upright and check your oil level, service as needed. For the pictures start at the bottom and work your way up, didn't know it would upload them backwards like this. Hope this helps anyone with this problem. If anyone has any additional info to add please comment!