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So my 510smr has 9000 miles. Only issue one bad relay (in the fuel pump). Valves still in spec. some piston slap she is high mile'er. Question is the bike does not start right up when cold. Not to say cold im in cali. but when I first start it. Once warm it starts fine. I am having to crank over, open throtle then close it fires then dies off idle. So you do that several times until it will idle and I let it warm up at idle as one should. Buy the way I keep fresh oil in it. Maybe why she has rolled said miles. Who knows maybe luck. Since I did had a 08 gernade at 800 miles, but husky gave me a 09 no money out of pocket, very cool. Im thinking fuel pump idle circuit or choke circuit. dont know if EFI has circuits any thoughts smj studs? jb out
 

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Valves out of adjustment is the first indicator when cold starting is hard
 

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what about other maintenance? is spark plug clean and in gap range? is throttle body clean? is sensor in airbox (if there is one - i presume there is a MAP sensor) clean?
 

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1st of all, if the valves are in check. is this the stock top end? Have you done a compression test? Top end should be shot by now as I would think.......
 
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