Replaced my NH 650 with a 1995 750 last year. Only 5000 miles but the carbs were dirty from having gas stored in it.
It stalled and ran like junk at low throttle so I pulled the carbs and cleaned them thoroughly and re-installed and balanced them. Or at least I think they are balanced. Good news, low end is fine and the engine sounds much smoother! Here is the trick. Rev it up in the shop and roll the throttle back and the rpm drops instantly. Get it on the road and the rpm stays the same or even jumps 500 rpm and then after 5 or 10 seconds will begin to descend. this only happens in motion. Pull over and try and repeat the problem and the rpm drops like it should. Back on the road and it will redevelop the problem. Checked the cable play. Lubed the cable and throttle linkages, balanced the carbs again and checked for an induction leak by spraying some starting fluid where the intake manifolds go into the engine. Would a dirty air filter do this? It looked good, but maybe not. The only thing I can figure changed from driveway to in motions is the air flow. Any advice would be welcomed. I would be tearing my hair out but ist already gone! Thanks 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.
