Engine does not want to redline

Posted by waffawaffa on Sep 07, 2011; 2:13am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Engine-does-not-want-to-redline-tp3315438.html

Hey everyone, I just bought a 1979 CB750f and just joined this forum. I hate to be one of those people that you just meet and they start talking about their grievances, but here I go.

 I love the bike except for one small issue. After 8k on the tach the bike hesitates to reach the redline. The bike just feels like it is starting to really take off, but it's held back from its full potential. The bike will reach redline slowly and roughly at 3/4 throttle, but goes no where at full. Everything on the bike is stock except the exhaust (I don't know what bike they came from).

I tried running it at half choke and nothing was noticeably different. Another run at full choke, and the bike ran exactly the same as without any choke at all, which I find interesting on its own.

The previous owner had recently tore down the carbs to clean them and add new gaskets. They are pretty well balanced and have a steady flow of fuel coming in.

I would really appreciate it if you engine guru's could help me out or point me in the right direction.

- James