Well today I emailed the seller who is a YSS agent. They've confirmed that the YSS unit is fully rebuildable. it comes with a C spanner and the adjuster ring is secured with a grub screw.

I did ask them about off road use and they confirmed it's suitable for green laning, but I think with all the RTW riders using it that's testament it self.

I think for the price and it having better feedback than hagon i'll give it a go. I'll just need to leave it a few weeks as family life is to busy to sit around waiting for farkles in the post haha.

I think for now the front can stay stock and just see how the bike responds to the new shock. I had a look when I replaced the oil earlier in the year and my bike is running linear springs and they were well with specs.