Re: cam chain rattle...

Posted by CB750Winger on Dec 17, 2009; 1:46am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/cam-chain-rattle-tp461888p461892.html

  For a little more detail, on the 69 - 78 SOHC models, rotate the crankshaft clockwise to 15 degrees after top dead center on #1 cylinder. With the point cover off, this will be the 1/4 set of points at the timing mark. 15 degrees is at the top center of the little spring peg below the "T" mark. Pull the spark plugs to see if it is at #1 or #4 or both valves will be closed and rocker arms will be loose. This position puts the chain slack at the rear of the engine and duplicates running conditions. Then loosen the chain adjustment locknut and bolt. This releases the bar inside and allows the spring to automatically adjust the tension on the chain. Now tighten the adjustment bolt and locknut. It's pretty easy after you do it once. I hope this helps.