Question about Honda CB 250 Nighthawk Motorcycles
I have a 1991 Honda Nighthawk CB250 an it runs/idles absolutely perfect. I rode it a couple times and then wanted to change the bar style and haven't ridden it since. I took it out today and everything's good to go only it keeps shutting off when I drop it into 1st gear. The side stand sensor is completely removed and I've tried to adjust the clutch. Any other suggestions? Thanks.
Usually this would be the side stand sensor. I would have thought that it would be normally closed circuit to operate though. Have you tried linking out the sensor wires? ie joining them together.
Posted on Feb 15, 2014
Testimonial: "I've done a lot of reading and I've narrowed it down to the sensor. The wires on the sensor are gone but I have the wires/plastic piece that plugs into the harness but I can't seem to find where it plugs in! I think when I rode it before it was plugged in and it was giving it a green light but now that it's unplugged I think the system is counting it as a red flag."
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Posted on Jan 02, 2017
The problem is an air leak leaning the fuel mix. The idle speed starts going up a ramp until it is wide open. The valves no longer seating well is a possible cause as is carb manifold gaskets, rings and a cylinder head not torqued down tight.
Posted on Apr 23, 2009
this may help,it doesnt sound like the clutch is out of adjustment,it sounds like the clutch plates have become stuck together,(this happens quite a bit if the bike has been parked for a while..ie over winter)..to fix it get the bike moving,down a drive way or something..then just bang it into gear,then shift into the highest gear you can by shifting without the clutch,once you have a bit of pace on simply hold the clutch lever in and work the throttle on and off all the while holding the clutch lever in,the clutch should free itself fairly quickly and should be back to normall,a lot of older bikes are good at doing this..hope this helps
Posted on Jul 16, 2009
Hi and welcome to FixYa,
Check / replace the diode that connects the clutch switch and neutral switch. The diode normally would have green/red and light green/red wires.
Good luck and thank you for asking FixYa.
Posted on Jan 05, 2010
I have had my 2008 Nighthawk 250 up to 70mph with some left over. I just got it so I haven't really run it full throttle yet ( 75 miles on the OD ) I weight 300 lbs. I would guess 80 on a flat road. I felt comfy at 70 but this is my 5th bike. I bought this one for the gas mileage and 1 yr. warranty. I will try actual top speed on the Interstate in about 1000 miles. Hope this helps. I like the bike. Chris
Posted on Jun 23, 2010
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