Having owned one of these bikes, I can vouch for the difference a fork oil change will make.
Likewise the steering head bearings. Pay careful attention to the state of the steering head race sockets when you do the bearings. These first Deltabox frames had a bit of a problem with the alloy being a bit soft, and after time you get a bit of ovalisation in the race sockets, which makes the races move a bit, giving you a bit of movement in the steering head.
I resolved this by using a metal-infused epoxy resin to pack the spaces. Not altogether a perfect solution but definitely easier and cheaper than milling out a slightly larger hole for larger races and bearings.
I also found that the bike benefitted from a heavier fork weight oil (I used 10w - original spec was 5W I think) although I found it made it a bit more susceptible to tank slap.
And seriously, those Z6s are amazing in the wet. I'm not sure if you can get an 18 inch rear though...
I had an IRC on the front of my FZR - and it was crap - never again. Sounds just like what you mentioned on yours - so maybe the FZR's are crap in the wet.
And I to my motorcycle parked like the soul of the junkyard. Restored, a bicycle fleshed with power, and tore off. Up Highway 106 continually drunk on the wind in my mouth. Wringing the handlebar for speed, wild to be wreckage forever.
- James Dickey, Cherrylog Road.
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