TacKler wrote:I suggest you obtain a manual if you don't have one already.  The removal is straight forward but a manual will explain the clutch rod difference in setup between the 75 and 100.  

The gearbox weighs about 20kg and on the 75 there is a finicky bit on installation that is made easier with a third hand.  A small trolley jack will save you some grief.

moriarti wrote: On refill i use 300ml of moly slip or similar product with the oil, gives a smoother gear change

Kim Hunter wrote:I have recently noticed a loud clanging noise coming from the gearbox/ clutch area.

92KK 84WW Olaf wrote:The complete assmbly is a lot more than the 15kg of the gear box but being on the wheel you dont actually end up lifting it.

moriarti wrote:Clymer manual is the best. Personally i drain the gearbox oil before removal saves a lot of mess.  On refill i use 300ml of moly slip or similar product with the oil, gives a smoother gear change

Interesting. About 1/3 of your gear box content is an additive/supplement as it's only about 950ml. I use 10% or about 100ml. I wouldn't pretend to know how much is allowable though. I use Moly Slip Gear Oil Supplement.

moriarti wrote:Me nether, a lot of my knowledge/information is from old school engine builders/tuners. The gearbox is more Tractor than sports bike but Moly does make a hell of a difference. Use a little or more as you think best. 

RS Rider wrote:

moriarti wrote:Me nether, a lot of my knowledge/information is from old school engine builders/tuners. The gearbox is more Tractor than sports bike but Moly does make a hell of a difference. Use a little or more as you think best. 

You'd think there would be a limit as to how much additive/supplement can be used to enhance gear box smoothness because the actual lubricant itself is being supplanted. Short of doing perhaps destructive testing (which would take time) how would one know where to stop as regards quantity added? Just thinking out loud.

duck wrote:

RS Rider wrote:

moriarti wrote:Me nether, a lot of my knowledge/information is from old school engine builders/tuners. The gearbox is more Tractor than sports bike but Moly does make a hell of a difference. Use a little or more as you think best. 

You'd think there would be a limit as to how much additive/supplement can be used to enhance gear box smoothness because the actual lubricant itself is being supplanted. Short of doing perhaps destructive testing (which would take time) how would one know where to stop as regards quantity added? Just thinking out loud.

Molyslip recommends a minimum of 5% which would be 40 ml. (But no maximum.)

Liquid additives are just gear oil with the moly in suspension so it's probably not the end of the world if you put in "too much."

Good to know. Perhaps I will bump up the quantity I use to 200-250ml.

Kim Hunter wrote:Hello Members.

I have recently noticed a loud clanging noise coming from the gearbox/ clutch area.
This is happening when in neutral. If clutch lever is pulled in, the noise disappears, returns again when lever released.
My bike is 1989 model with about 65,000 km travelled. All original condition, not been messed with.

Any assistance greatly appreciated.

Rick G wrote:I would say that you have little choice but remove the gearbox and check it out. I can think of quite a few things and all need the gearbox removed and the clutch inspected.

Olaf wrote:It could be inside the bell housing but as said a split is required.

Point-Seven-five wrote:When the clutch cable on my K75RT was adjusted for 75mm the lever clanged on the muffler.  Pulling the clutch in made the noise stop.  Adjusting the free cable length a tiny bit shorter to 72mm stopped the clanging.  You say it sounds like it's coming from the rear of the transmission and that's where the lever is.

A quick check would be to put a rag between the lever and the muffle and see if the clanging stops.

gabriel wrote:I’m thinking perhaps the clutch friction plate splines are stripped which might explain why you don’t hear the noise when you  disengage the clutch.
Check your gearbox input shaft splines…. Good luck