When the bike won't start, do you hear the starter trying to kick in? If not, put your hand on it when you push the starter button to see if you feel it trying to engage. If not, then I would start looking at that.
I'm thinking about what I would do next if the starter seems to be working. If it were me, and thinking of our 650 and presuming the 750 is similar, I would carry a screw driver and a socket that fit the nut for the engine crank shaft. When the engine won't start, pull the cover on the right that covers the points, put the socket on the nut and see if you can rotate the crankshaft. You will have to turn it in the "tightening" direction so you don't loosen the nut. If that can be turned, I don't think it's an interference fit. You might want to try this when it's cold and would normally start to see if you can turn it and how easily it turns. You may need a longer "breaker" bar to get it to move. and BE SURE THE KEY IS OFF. I might flip the kill switch just to be safe. I'll look forward to see what others may try. On Wednesday, January 19, 2022 at 10:46:08 AM UTC-5 [email protected] wrote: > Hello Nighthawk lovers, I already tested the battery and alternator and as > a results I think is Ok, at 2000 rpm the alternator charged 14.3 volts and > battery charge, with engine off is 12.59 volts as is shown on the next photo > Please do you has some another idea how to check the electrical condition, > on the bike > > El mié., 19 de enero de 2022 10:50, DNev <[email protected]> escribió: > >> We just had a regulator go bad on our 650. It's not hard to pin out, but >> if you are not familiar with a voltmeter or can't find the pin assignments >> for a 750, another way to test the battery would be to try jumping it with >> a second battery using jumper cables when it is "dead". I'm not familiar >> with the 750 or how easy it would be to do this but on the 650 all you had >> to do was pull the side cover. If it starts it's probably the regulator. >> >> On Tuesday, January 18, 2022 at 10:47:55 PM UTC-5 [email protected] >> wrote: >> >>> The voltage of a dead battery might go back up a little as it sits >>> overnight, enough to move the starter. >>> Eliminate that problem, and YES, do go over the bike and tighten things >>> like the bolts that secure the coils to the frame. >>> >>> Once you have the multimeter, you can test the other parts that could be >>> failing. >>> >>> Your failure is either electrical related or heat/expansion related. >>> Eliminate electric stuff first. >>> >>> >>> On Wed, Jan 19, 2022 at 11:41 AM Francisco Gomez <[email protected]> >>> wrote: >>> >>>> Drew thanks a lot for your answer, I will test the regulator to check >>>> if it is ok, more than 14 volts. >>>> But something strange is, when the engine become cold, the starter >>>> motor move the engine very well, this is my problem. >>>> As soon as we get the results, will paste on the forum discussion >>>> Beste regards >>>> >>>> El mar., 18 de enero de 2022 23:28, Greg Holuban <[email protected]> >>>> escribió: >>>> >>>>> Starter solenoid? >>>>> >>>>> Sent from my Verizon, Samsung Galaxy smartphone >>>>> Get Outlook for Android <https://aka.ms/AAb9ysg> >>>>> ------------------------------ >>>>> *From:* [email protected] <[email protected]> >>>>> on behalf of Drew Gormley <[email protected]> >>>>> *Sent:* Tuesday, January 18, 2022 7:13:17 PM >>>>> *To:* [email protected] <[email protected]> >>>>> *Subject:* Re: [Nighthawk Lovers] Mystery Problem with my Nighthawk >>>>> 1998 >>>>> >>>>> >>>>> Battery might get too low if your regulator is failed. >>>>> >>>>> You need to check the volts with a mutli-meter when the bike is >>>>> running below 2k rpms and above. >>>>> Above it should be putting out 14 v (about that much) >>>>> >>>>> If it isn't your regulator is gone and the battery is dying as you >>>>> ride. Nothing is recharging it. >>>>> >>>>> >>>>> On Wed, Jan 19, 2022 at 10:35 AM Francisco Gomez <[email protected]> >>>>> wrote: >>>>> >>>>> Hello Nighthawk lovers, this is Francisco Gomez, Seven Fifty 750 >>>>> owner, year1998, Seven Fifty is a Nighthawk European model, it has some >>>>> performance instead American Night hawk, but basically is the same >>>>> engine. >>>>> Now I detected a problem in my Motorcycle which is as follow: When >>>>> the engine is hot, after some millage done, the engine can not start >>>>> again,it´s lock like as battery bad, the starter motor can not move the >>>>> engine, and I already checked the Starter motor, condition of Battery ( >>>>> was >>>>> good ) and almost wires and all things related to ignition system, but >>>>> any >>>>> problem was found, only when the engine is cold the starter motor >>>>> function >>>>> very well. >>>>> Please, some body of this group has some experience about how to solve >>>>> this problem. >>>>> I will appreciated so much your guidance and opinion in this matter >>>>> Best regards >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Nighthawk Motorcycle Lovers!" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/nighthawk_lovers/CAKzf0erzyFOiEaswxwqPHJ8Wi3TR9Z5ZVOvE907cnXbtOQQMng%40mail.gmail.com >>>>> >>>>> <https://groups.google.com/d/msgid/nighthawk_lovers/CAKzf0erzyFOiEaswxwqPHJ8Wi3TR9Z5ZVOvE907cnXbtOQQMng%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Nighthawk Motorcycle Lovers!" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/nighthawk_lovers/CAJLiyZfbBP8knqkOD9d6h8AhwLMhMJ_wn8Ai6DxKsrQE49CdAg%40mail.gmail.com >>>>> >>>>> <https://groups.google.com/d/msgid/nighthawk_lovers/CAJLiyZfbBP8knqkOD9d6h8AhwLMhMJ_wn8Ai6DxKsrQE49CdAg%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Nighthawk Motorcycle Lovers!" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/nighthawk_lovers/BL0PR02MB43372E106054931F7DDD556FF2599%40BL0PR02MB4337.namprd02.prod.outlook.com >>>>> >>>>> <https://groups.google.com/d/msgid/nighthawk_lovers/BL0PR02MB43372E106054931F7DDD556FF2599%40BL0PR02MB4337.namprd02.prod.outlook.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Nighthawk Motorcycle Lovers!" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> >>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/nighthawk_lovers/CAKzf0eqAaoiu6w%2BJPyaBUSH1mS-wUCXYTi%2BSp0SThxcHYqPCFA%40mail.gmail.com >>>> >>>> <https://groups.google.com/d/msgid/nighthawk_lovers/CAKzf0eqAaoiu6w%2BJPyaBUSH1mS-wUCXYTi%2BSp0SThxcHYqPCFA%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- >> You received this message because you are subscribed to the Google Groups >> "Nighthawk Motorcycle Lovers!" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/nighthawk_lovers/f545c1b3-6f43-4769-aa3d-ce71c0330f01n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/nighthawk_lovers/f545c1b3-6f43-4769-aa3d-ce71c0330f01n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. 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