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Old 04-07-2018, 08:23 PM   #2
Flip
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Join Date: Mar 2010
Location: Beachtown
Bike: M900
Posts: 2,188
If you are 100% certain the battery is good then I would be looking at the starter relay (solenoid) but would also be looking at the condition of all the ground leads where they bond to the frame/engine. If the leads are anything like the earlier bikes then they are somewhat marginal to begin with.

There's a lot of these questions/problems around the forum at the moment and in particular a lot of them are S4's and S4R's for some reason.
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