Montesa 301 RR Clutch Issues

[Montesa301]

Morning, 

I’m looking for some help with my Montesa 301 RR 2022 clutch. I’ve had issues with the clutch since purchase a year ago. It’s progressively got worse with juddering, shrieking when hot and now a grinding sound under engine breaking.

 

Ive changed the plates out for Mitani Alluminium discs, fresh HTX 740 and it hasn’t improved or changed at all. 
 

Any advice would be much appreciated.

[lemur]

From a site that sells that expensive lubricant: "ELF HTX 740 is a monograde ultra fluid transmission lubricant specially developed for dry clutch gearboxes coupled to 2-stroke engines. "  I would try something cheaper that you can change out every time you get water in it, nothing will make your wet clutch act up and make noise as bad as having water in the oil.  It's not the steels that are causing a problem it's your cork and/or paper friction plates.

 

[jrsunt]

Get rid of the Elf, it’s great when the bike is cold but can’t handle the heat of a properly used 4rt. Use the same 10w40 that you use in the engine. I also run the Mitani clutch. Try that first, if it doesn’t help then something else isn’t right. 

Edited 5 hours ago by jrsunt

[lemur]

Kubota UDT or similar farm tractor and excavator hydraulic oil 👍  at about 10 bucks per litre works out to ~5 bucks per oil change.  Extensively tested for over 2 decades and 5 Cota'   ... your transmission does not require multiple-grade engine oil, it has far more in common with a farm tractor transmission that contains hydraulics, gears and wet brakes and wet clutches.  If you think your motorcycles transmission oil is under higher stress then a farm tractor or excavator would experience you would be wrong.

 

[jrsunt]

A multigrade oil is not necessary, but something like the Motul 300v is also designed for wet clutches in sports bikes which is perfect for the Mont. None of the light gear oils can handle the 4rt when they are ridden hard, big climbs, steps or prolonged slipping and feathering then the clutch becomes grabby, snatchy and eventually it’s hard to change gear. 

The light/thin oils are perfect for clubman riders, but anything more it’s just not up to the job. 
 

[lemur]

Thankfully nobody is recommending a thin light gear oil in your 4RT transmission 🤔 for any rider.  

UDT is ISO 46 viscosity same as the HTX biggest difference it is half the cost 🤓 so you can change it twice as often.  Replace every 15 hours operation <- that's the factory recommendation how close have you kept to that?

... and if you use power washers on your motorcycle stop doing that.

Edited 36 minutes ago by lemur