Loss of power, open throttle, 93 Nighthawk

Posted by Mick on Apr 21, 2011; 7:29pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Loss-of-power-open-throttle-93-Nighthawk-tp2848286.html

Hi Folks,
I have just acquired a '93 750 Nighthawk, with just 16,000 miles on the clock. Its spent years in a damp shed here in the UK, but I've cleaned and touched her up, changed the oil to fully sythetic, new oil and air filters as well as fixed brakes etc etc. (No the tacho doesnt work!)
She is now running fine, not totally happy starting when cold and damp, but running fine, except that when I'm on a long hill, on the motorway, she starts to run out of power, and opening the throttle further drops the power even more.
In first, second and third gear, all is well, but over 85 in 4th and fifth, she's a no go....(fine up to that speed!)
Anyone know a likely culprit?
No I havent changed the plugs, but are they likely, its unlikely to be blocked jets 'cos she snaps to life in the lower gears, but it rather feels like fuel starvation?...(tank is clean, spotless...no crud)
Is th9s a fault anyone recognises, would appreciate any advice....
Thanks
Mick