I recently bought a 1984 nighthawk 650 as my first bike and have been pretty happy with it but it does have one issue that is pretty annoying and keeping me from riding it much. The issue is that the bike is sluggish in response to the throttle and has no power above about 80km per hour. It runs well warms up like it should, runs without choke, and is a tolerable ride at lower speeds but will not maintain highway speeds no matter what I do. I can get it up to 100 km/hr (60mph) on flat ground but cant maintain it in any gear. Sitting in neutral the engine will rev up to 8000 easily but under load it wont top 6000 and seems to have no power. Going from half throttle to full throttle doesn't seem to have any effect at all under load. I had the mechanic at the local Honda dealership where I bought it take it for a ride and he suggested it may be a case of cracked diaphragms in the carbs. does that sound right to you fellow nighthawk riders? has anyone else had a similar issue and if so how did you solve it? aside from carburetor issues is there anything else that would cause these symptoms? The bike has 47000 km (aprox 29000 miles) on it if that matters. Really hoping someone can help me track down and fix this as I would love to be able to get this bike out on the road.
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