Join Date: Dec 2008
Location: Port Macquarie, NSW, Australia
Hi folks, I have a developing issue that I’d like your thoughts on. Yesterday riding the bike all was well, but moving the bike (riding it) while still at operating temps when I got home generated a substantial clunk in the driveshaft/transmission area when I let the clutch out while in first. Today with driveshaft UJ’s and all fluids cold I could not generate the sound as I had yesterday - when all was at operating temperature. However, with the bike on the centre stand and in first, if I feathered the rear brake and released the clutch I could replicate the sound.
So my better half was called to the cause and using a stethoscope (large screwdriver) identified the area closest to the front universal joint as being the culprit. While the sound could be detected in the transmission, she is adamant it is louder closer to the front UJ.
I’ve owned my 1200RS from new and the old girl has 183,000kms on her. Transmission has never been opened, the clutch is original and - last time I looked - in good condition and well within specs. I was given a driveshaft (70,000kms) some years ago and decided to fit this prior to shipping the bike back to Australia after 15 years in New Zealand. Shipping and storage amounted to 7 or 8 months with the bike hardly being ridden. Some extended two up touring was done with the replacement driveshaft prior to shipping and I’ve done 1500kms since bank in Australia without issues.
My first thoughts are to put the original driveshaft back in the bike and see if this is a fix as it’s a relatively easy task using Pierre’s method, but thought I’d first raise this on the forum to get others thoughts on this. Another though just to mind, is that I’ve been aware of ever so slight vibration through the bike at highway speeds. Just enough to make the instruments seem not so easy to read. I figured maybe the front tire, or at worst, a crown wheel bearing on the demise, but now I’ll add the driveshaft UJ as a possible cause.
Thanks as always for advice and thoughts.
2002 K1200RS Owned from new. Pacific Blue of course. Suspended on Ohlins. 183,000kmís
2016 K1300R Black, 6000kmís
The family history
1951 AJS 500 single - my Dads
1916 Triumph Type H, Western front, France WW1 - my Grandads
Last edited by flyingkiwi; Jan 18th, 2020 at 5:49 am.
Reason: Additional information