A while back I posted about a surging engine on my 95 Hawk when I let off the throttle to shift. I had cleaned the carbs that were clearly dirty and then synched them. I had not pulled the idle circuit screws.
The dying without choke problem was replaced with this surge of 500 - 1000 rpm when I went to shift! A few people were able to give me some suggestions and a few more asked that I post if I figured it out. The upshot - I removed the carbs again and this time I cut the heads of the screws that control the idle mixture. I then cleaned the needles and blasted carb cleaner through those passages, bench synched the carbs and reinstalled them. The problem is mostly gone and I have to do some more tuning yet, so dirty still dirty carbs it is. One of my EAA buddies introduced me to a friend of his who spent many years as a Honda mechanic. He had some words of advice: The problem is definitely caused by a dirty carburetor. He said in the attempt to meed emissions standards the late year Nighhawks have lean spots in the carbs on their best days and ANY amount of dirt or gunk in the carb will cause this problem. He asked how I cleaned the jets and I told him about pulling them out and using some copper wire to clean the smaller holes. He said that he actually used to use the back end of small model size drill bits to do this so that he was sure that any gunk or varnish was removed from the passages. Hope this helps someone else. Daniel -- 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 post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/nighthawk_lovers. For more options, visit https://groups.google.com/d/optout.
