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I have a 2012 R and it sometimes takes a long time to start. It struggles to start even though the battery is fine and plugs are new.

I notice it may happen more when using ethanol blend gas. It seems to be better with gas that has no ethanol.

What could it be? How long do the coilpacks last?
 

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you need to check the residual fuel pressure. most likely its dropping off at times due to a possibly faulty fuel pump check valve.

have someone put a guage on it, start the engine and shut it off. the pressure should drop and then hold steady. if it holds steady let it set overnight. if it drops close to close to zero thats the problem.
it'll probably hold fine a few times and then drop close to zero at the next cycle.
 
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