Hi
I've just got an ST4s and have similar hit and miss on starting from cold. Sometimes it's first time and sometimes its six or seven goes. I find the bike tends to start better with no fast idle.
I looked at the starter cables and thought they were quite up to the job. all the connections to the battery were slightly loose so I tightened them up at the weekend which seems to have improved starting - but still not what I would expect from an 18 month old bike.
I may go down the route of bigger gauge cables, but the ones I have seen for cars don't look that much more beefy than the ones I have already. What gauge do people use if they replace the cables?
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