Join Date: Oct 2010
Location: Yorktown, VA, USA
K75 Splines Lubed!
Last week after reading everything I could find on clutch and driveshaft splines on my 64K K75 I jumped into the process.
I just completed a 4300 mile trip this summer and needed to replace the tires which would include a rear spline lube but I was not sure if the clutch splines should be lubed as well. My airheads have a well-documented need to keep the splines lubed but I found conflicting information regarding the bricks. Some say to do it, some say not necessary. I was having NO issues with the bike.
I'm a competent hobby mechanic with a well-outfitted shop and extra motorcycles in case it takes more time than planned. So after reading all the procedures I could find it was time to start and plan for an all-day operation.
What I found was that a methodical dissembly/reassembly approach is vital as it is not a quick procedure to remove the transmission to fully access the splines. Good news, the splines are in great shape and were still tacky with lube before cleaning and a good coat of Honda Moly 60. From start to finish - 8 hours of work. I also cleaned the starter and replaced the alternator drive rubber dampers as long as everything was apart.
So... is it necessary to regularly lube the clutch splines? I can't say for sure but I want this fine motorcycle to last a long time and I'll do it again at 100k or so to be sure.
1982 Yamaha XJ650RJ Seca