Question about 1993 Honda CB 750 Nighthawk

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Stalls out past 70 mph on hills and with full tank of gas

Perhaps its the pilot screw adjustment but it was CT, RI and MA not the rockies. Also the carbs were just cleaned

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Were they taken completely apart? It sounds like you have a clogged main jet, or your needle is not moving up. Could be bad vacuum piston seals, or slides gummed up. If they weren't taken completely apart, that is where to start.

Posted on Jun 29, 2009

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The key to your problem is the phrase "Also the carbs were just cleaned"
You have done something wrong.
Check for air leaks, worn seals, worn needles, etc. cleaning the carbs is the obvious point at which something was last changed.

Posted on Jun 29, 2009

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6. Keep idle time to a bare minimum or turn off the engine.
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11. Keep your engine clean, dirt and grease/oil hold in heat.
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13. Any unnecessary bling on your bike is going to decrease fuel efficiency.
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15. Keep warm up time to a minimum get off the choke ASAP.
16. Motorcycles run best when their engines are maintained, and that includes making sure the air filter is clean, the spark plugs are fresh, the fuel filter is free, and the timing/valves are adjusted.
For more information about your issue, please visit the websites below. Good luck and have a nice day.
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4. Take off from a dead stop should be smooth and easy throttle applied avoid excessive throttle snaps.
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8. Keep chain/belt properly adjusted.
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13. Any unnecessary bling on your bike is going to decrease fuel efficiency.
14. Use high-quality fuel using low-quality fuel can cause sludge in your fuel injectors.
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