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Thread: NC700X Hard to Start Intermittently

  1. #91
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    Yes mine still does long crank on occasion..........usually after it sits with no use.
    Mine has a new battery..........old one was still good but original.
    It did remove and check the idle air control valve .......after which the long crank did not occur for aleast 45 days.
    I also checked the plugs that look perfect ( except excessive gap) and ignoring the shop manual adjusted the spark gap back into spec. I did the air controller thing and plugs at the same time. Which again is a mistake if your trying to isolate a cause or find a root cause.

    If mine does not start in the first 3-5 seconds of cranking........I open the throttle just slightly (1/8 turn) and it always fires up.
    Last edited by showkey; 11th June 2018 at 12:08.

  2. #92
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    Bike: 2014 NC700x
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    Last May, I purchased a leftover 2014 with zero miles. Love the bike but the last few days I've had the same issues, and the very 1st video is exactly what my bike is doing. The bike normally starts as soon as I hit the button. The last couple days it started the cranking but take a while to start. After it starts it has a very rough idle and bogs down when I give it the gas. If I go back a little while later its seems to clear up. I wonder if it could be something in my tank? I think I've found the release valve underneath to drain the fuel. Is there another inline filter I can check between the tank and motor? I can not find one in the manual. If I fill the tank and put in FE cleaner could that help clean out any gunk?

    The bike only has 1400 miles on it so I do not think its mechanical. I keep in a shed so its out of the weather, but last year I did add some gas stabilizer. Its been at least two fill ups since the season started but I wonder If I jacked something up. Thoughts?

  3. #93
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    ^^^^^^^^^^
    There is no in line filter after the in tank pump.
    There are small screens at the injector inlets.........if they were plugged I don’t think it would be intermittent problem.

  4. #94
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    Thanks for the info. How about this. After I turn the bike on, right after the fuel pump starts up, I hear a small zap or buzz like noise come from the front of the bike. Sounds like its down around the exhaust headers. Is that the starter relay switch kicking in? I do not recall hearing that noise before.

  5. #95
    Senior Member NC700X Hard to Start Intermittently davidc83's Avatar
    Bike: Suzuki C50; 2009 klx250sf; 2013 Nc700
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    Just wondering, when you fill up the bike; how high are you filling the bike in the filler neck. I was at a local motorcycle shop and saw numerous stickers on bikes (which i had not seen before), stating 'do not overfill the bike in the filler neck. Doing so could result in hard starting/long cranking'.....If over filling is causing some kind of vapor lock in the system, check your fuel overflow tube (under the bike) and see if there is any fuel in the line, if so, empty and see what happens..
    [SIGPIC][/SIGPIC]

  6. #96
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    Quote Originally Posted by Jerrdawg View Post
    Thanks for the info. How about this. After I turn the bike on, right after the fuel pump starts up, I hear a small zap or buzz like noise come from the front of the bike. Sounds like its down around the exhaust headers. Is that the starter relay switch kicking in? I do not recall hearing that noise before.

    That noise is normal............the one from the front is the IAC ( idle air control valve) cycling. Shop manual make a reference to that buzz. The IAC is attached to the throttle body.

  7. #97
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    So... I found this thread last night because I've been having the same issue for the last couple of weeks. Yesterday, I got stranded at work - not fun. I called out the breakdown truck and he looked at a few things and said everything looked fine. I mentioned that I hadn't heard the fuel pump whirring when I turned the key so he raised the fuel filler cover / rear seat, looked down where the wires disappear towards the rear light cluster, stuck the end of a screwdriver down and gave it a couple of taps - hey presto! Started straight away after that.

    He said that the fuel pump solenoid may be a little sticky, but should be simple enough to replace myself when I get the bike home. I hope that helps someone else. I can provide a picture or video later if anyone wants a better description.

  8. #98
    Senior Member rmezei's Avatar
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    What's that digital red thing? thermometer? and where did you get it?

  9. #99
    Senior Member anglachel's Avatar
    Bike: 2012 NC700Xc
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    Quote Originally Posted by davidc83 View Post
    Just wondering, when you fill up the bike; how high are you filling the bike in the filler neck. I was at a local motorcycle shop and saw numerous stickers on bikes (which i had not seen before), stating 'do not overfill the bike in the filler neck. Doing so could result in hard starting/long cranking'.....If over filling is causing some kind of vapor lock in the system, check your fuel overflow tube (under the bike) and see if there is any fuel in the line, if so, empty and see what happens..
    I believe the problems being referenced from over filling would be around the evap system... charcoal canister gets "flooded" (probably wrong term)...

    The charcoal canisters is plumbed to dump fumes back into the engine, and if the computer can't compensate for that your fuel air mix is off...

  10. #100
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    Bike: 2014 NC700x
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    Quote Originally Posted by showkey View Post
    That noise is normal............the one from the front is the IAC ( idle air control valve) cycling. Shop manual make a reference to that buzz. The IAC is attached to the throttle body.
    Thanks Showkey. Yup that is the noise.

    I have spark so I figure it has to bee fuel, right? The pump and solenoid seem to be working. I only had a gallon on gas in it, So I filled out the tank and added some fuel injection cleaner. I wonder if its the gas. Last fill up was April 29th. Weather kinda got crappy on the east coast. I recall reading somewhere that Ethanol breaks down after a few weeks. My fingers are crossed.

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