[ST] Head Shake

["Marc Van Est" <MarcVE@xxxxxxxxxxxxxx>]

Hi All,

I've been playing with the preload etc on my RS, and thought I had it perfect until the run I did on Sunday.

Between Darling and Mamre up our West Coast there is a nice run you can do, but its very bumpy. I went with a mate on his old Yamaha 1.1 Midnight Special, and we were running 140/150 KPH once we got clear of Darling. This is the first time I've run the bike fast-ish over very bumpy sections.

I'm still running BT57's (not for much longer!) - planning to go to '014's next week as I can get a good deal on them and another mate wants my front BT57.

Twice I hit a very bumpy section and had my bike do a headshake - very unsettling. It didn't develop into anything resembling a tank slapper, but enough to rattle me. If it had happened in a corner I might have lost the plot.

My mate on his old 1.1 was fine - just complaining that he was getting airborne from time to time.

Here's my question : The preload (and rear rebound) is set pretty close to the max recommended in the guideline, and that seems to give me the right static sag measurements, as done by a mate. On better roads it handles nicely. 

If I back off the preload a touch on the front and rear - will it get rid of the head shake or make it worse?


thanks


Marc
Cape Town





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