Re: 1981 CB750 C custom "DOHC" Engine ISSUE

Posted by Dwrecktum on Sep 12, 2010; 2:04am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/1981-CB750-C-custom-DOHC-Engine-ISSUE-tp1456569p1459396.html

More info on what i did last night... Checked voltage @ battery its good. Checked starter resistance to ground. GOOD Performed voltage drop checks between all connections including the solenoid... Checked voltage output on starter side of solenoid is good...
Removed spark plugs and starter would still not turn engine.
Removed timing cover... Here's my big mistake... The bolt i chose to turn on said 10 on it... But what i didn't realize that it was actually machined down to more of a 7 or 8mm shank... W/ a screwdriver in the #4 spark plug hole my partner felt the piston move upwards only slightly before i broke the bolt... :( used a pin style punch to remove portion of bolt from the end of the crank... (got incredible lucky)
Got a new bolt from a bike wreckers today...

Little info about me: I'm a H/D technician i work on on road trucks in alberta canada... I'm incredibly familiar with starting systems and issues because as you can imagine at -25 to -40 Deg Celcius during the winter trucks tend to not start... So I traced everything to my knowledge...
In my free time I fix old quads and the occasional dirt bike... Always only one cylinder though... This will be the first engine of this type i've played with... So i'm more than willing to take all advice that anyone here has as i'm sure you've all dealt with a lot of similar issues...