Re: Loss of power, open throttle, 93 Nighthawk

Posted by LukeM on Apr 21, 2011; 11:55pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Loss-of-power-open-throttle-93-Nighthawk-tp2848286p2849334.html

Check the venting for the gas tank.  One way to check is pop the gas cap and see if 1) it's hard to remove due to vacuum in the tank) 2) the vent in the cap (if there is one) is blocked.

It may not explain why it doesn't happen in the lower gears, but normally acceleration in the upper gears means longer high-load engine speeds, which may use more gas.

Check the FSM here and see what it may say about loss of power at high speeds.

Might want to swap the plugs as well. Check the color first: should be a light tan color on the insulators, and no wetness.  Black shiny means too much fuel, oil = oil problems (valve guides or seals, or maybe rings, and blue smoke out the back).  

I hope this helps.
Luke M