I have TLR250 but should be similar. I tried a good (expensive) motorcycle wet clutch friendly oil which resulted in a very grabby, juddery, noisy clutch. After contacting the previous owner and looking through the forums I changed to (cheap) Castrol GTX (20w50 I think) friction modified car engine oil and intsalled a clutch anti-judder kit. The improvement was huge, the clutch now works as it should.