Re: 1981 CB750 C custom "DOHC" Engine ISSUE

Posted by Rodgil on Jun 25, 2011; 1:26am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/1981-CB750-C-custom-DOHC-Engine-ISSUE-tp1456569p3106907.html

It is possably a leak from the head gasket, at the join between the cylinder head, and the cylinder. You should be able to see where they meet. If this is where the leak is coming from, you may me able to stop it, or reduce it, by re-tensioning the head bolts. Remove the fuel tank, and valve cover. Using a tension wrench, loosen and re-tighten the head bolts to the correct torque (3.6 to 4 kg/m, of 26 to 29 ft/lb), one at a time. Do this twice. That proceedure cured my oil leak.
If you are in the US, your carburettor has an accelerator pump, to give extra fuel when you quickly open the throttle. That is a possible cause of your hesitation when you crack the throttle, if yours isn't working properly. Check the workshop manual on this forum for more info. It also lists possible faults and causes.
Good luck!