Re: 1980 CB750 Custom - Running Hot

Posted by Larry spillman on Jan 14, 2013; 12:45am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/1980-CB750-Custom-Running-Hot-tp4035245p4035260.html



Since you altered so much The first thing you need to check is that you dont have a vacuum leak at intake.also check nothing was left off carbs such as o rings or metal washers under screws,If you are running rich your plugs will be black.If timing is too late you wont get a full burn either and fuel can pop in exhaust being too rich.If you are lean again it may be a vacuum leak as a leak will lean out a motor to the point it can melt pistons and valves edges.You are stuck checking everything now since you altered soo much.