1985 Nighthawk S Carb Issues

philipk65 · 09-18-2009, 07:08 PM

Hi, I have a 1985 Nighthawk S with 1000 miles on it. It's sat for a while. I took the carbs apart and cleaned them. I starts right up and runs great in the higher RPM range (4K- and above) and idles fairly descent. It's the 2K-4K rpm range that it sputters and is sluggish. What can I do to correct the problem? Thanks! Kevin

pidaster · 09-20-2009, 08:23 PM

If you leave the choke about halfway does it help?

philipk65 · 09-20-2009, 11:26 PM

Yes, It helps alittle bit.

pidaster · 09-20-2009, 11:31 PM

Sounds like it's running a bit lean. I'm no expert on carbs but you might have to shim the needle a bit. I had to do the same on mine. It had a flat spot around 3k-4500.

09-18-2009, 07:08 PM	#1
philipk65 Motorcyclist Join Date: May 2008 Posts: 12	1985 Nighthawk S Carb Issues Hi, I have a 1985 Nighthawk S with 1000 miles on it. It's sat for a while. I took the carbs apart and cleaned them. I starts right up and runs great in the higher RPM range (4K- and above) and idles fairly descent. It's the 2K-4K rpm range that it sputters and is sluggish. What can I do to correct the problem? Thanks! Kevin

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09-20-2009, 08:23 PM	#2
pidaster Motorcyclist Join Date: Sep 2009 Location: South Mississippi Posts: 7	If you leave the choke about halfway does it help?

09-20-2009, 11:26 PM	#3
philipk65 Motorcyclist Join Date: May 2008 Posts: 12	Yes, It helps alittle bit.

09-20-2009, 11:31 PM	#4
pidaster Motorcyclist Join Date: Sep 2009 Location: South Mississippi Posts: 7	Sounds like it's running a bit lean. I'm no expert on carbs but you might have to shim the needle a bit. I had to do the same on mine. It had a flat spot around 3k-4500.