--- In st2_owners@yahoogroups.com, Ray Tushingham <enoughbikes@...> wrote:
>
> From what I`ve understood and read, both the ST4 and ST4S had the flaking rocker
> issue, which is one of the reasons my first Duc was an ST2. (Love it by the
> way). Certain model years of the ST4S were prone to main bearing/crank issues
> but if you drive it hard enough, the ST4 main bearings can fail.
Ray,
Just one man's experience: I have an ST4s built 7/01, purchased 10/01, put in service 4/02. It now has 55K miles. It has never needed a rocker or a shim for that matter. No indication of a bearing problem but that can happen suddenly (like in the middle of the Nevada desert). I have had 3 ECUs in the bike and carry a spare on trips. I replaced a temp sensor last fall. I follow "the Book" on maintenance. Twice I've had a fuel line in the tank pop off causing great inconvenience but I blame my own work (poor choice of fuel line) for that.
I don't do track days and couldn't say that I ride the bike hard. I've always used Mobil 1 (changed every 3k miles) and premium fuel.
Most of my riding is done at altitude ( I live at 8,300 feet) and that may stress the engine less. I get a crazy 50 to 55 mpg. Your mileage may vary.
Jeff in Colorado
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