We have a ‘dale MT 800. We have a ‘zochhi Z1 lite on it – it went back to windwave to have a reinforced steel steerer fitted ( £40)instead of the alloy one it comes with I bought it second hand. Its a coil / air fork so can be adjusted but I found that with enough air to get the right ride height it did not get full travel and with low air to get full travel it rode too low – so put a preload collar of 15 mm on the coil spring so it rides higher on a lower air pressure and dropped the oil level a bit to reduce ramp up. Its now about spot on – 40 psi for flatland riding and 55 for more gnarly stuff.
It does lift the front of the bike ridiculously high tho – front BB is almost 17″ unladen.
We have also run it with a DJ1 fork on it ( a couple of inches shorter) – with the stiffest springs available and air capos of a different DJ model to get the right spring rate.
20 mm axle a must and ‘zochhi are one of the few companies who don’t mind their forks being used on tandems