Hi folks, I have an 86' Honda GB500 that uses an air cooled, dry sump. I have noticed that on long rides or when the motor is running hot. My clutch gets grabby when the motors gets running really hot, so I start shifting more slowly and deliberately after noticing the clutch acting up i.e finding hard to Neutral from 1st. strangely, when I fire up the bike after a cold morning, gear shifts is very smooth as the oil hasn't been broken into yet. Currently using 10w40 but keen to try 15w. So I am contemplating if thicker oil will help fix it. On the highway it's hard to notice, but in city driving it's obvious when the clutch starts doing that. For those who have a single cylinder thumpers running on an air cooled dry sump, is this just a characteristic to live with?