- My Ten sometimes doesn't go into first from neutral. I have to spin up the engine a bit and then it engages first when I try it again. Is this signs of clutch getting old?
Probably unlikely to be a worn clutch, not really the symptoms you'd expect. Could be a number of things. Check the easy first, such as the free play in the cable - is it too much and the plates aren't releasing fully? Could be that the lever arm is not fitted in the right position on top of the RH casing - do the punch marks line up when it is in the furthest forward position? I guess the friction plates could have swollen due to incorrect oil used in the past? Maybe you're suffering from clutch drag because of the wrong grade/type of oil - if it's too viscous for the ambient temperatures it will drag, especially when cold, making selection of first from neutral rough, stiff or jerky. Try revving the engine a couple of times with the clutch pulled (disengaged) before engaging first, this will free off the plates. I quite often do this on very cold mornings as it makes things a lot smoother.
- How would I know when it is time to replace the clutch, or when is generally a good time for this?
Mine's done 40K and as far as I can tell the clutch is still good, many will see 60K before a new clutch is needed. However, it depends how you, or the previous owner(s) have ridden it. They can go as quickly as 10K miles! Slippage is usually the first sign that it's on its way out.
- When I go over bumps in the road I can hear my forks (or at least one of them), what sounds to me, release air. My Sertao never did that. Do I need to take a look at the forks, maybe service them a bit or is that natural? It's just a short burst when the fork is compressings.
That'll be exactly what Jon said - air escaping from the fork gaiters, which is perfectly normal.
- Do I need the Kev mod for stage one conversion (hacked off snorkel) and will stage one have any impact on fuel consumption? Since I chopped the snorkel on the air box my Ten's gotten a bit more thirsty. It can also just be me that changed my riding style to hooligan.
Just cutting off the snorkel doesn't necessarily require any fuelling modification, but to feel the benefits fitting one would help as you've weakened slightly an already weak A/F ratio. As soon as you fit a free-flowing filter, you will need to do something to richen things up. As for the consumption, you're probably like the throaty induction roar so your subconscieously giving it more gas!
- I have a new TKC80 on the back but would like to hear what you'd recommend for the front. I love the way the bike feels with the new shoes on the back but I have to get rid of the stock Tourance in front.
... A TKC80 front perhaps! 
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