would not start

[fordsparky]

Hello everyone;
hope this is in right spot and helps somebody else... just picked up 1979 CB750 Limited with over 53,000 km and she would not start - so i did the following and lucked out...
1- vacuumed out mouse storage pile of bird seed from air box and replaced filter
2- changed and charged a new battery
3- openend drain screws on bottom of carb bowls and observed yellow fuel and drained
4- removed fuel tank drained then filled with 100% sea foam swished let sit overnight and drained
5- after re-installed fuel tank with an in-line fuel filter and put another can of seafoam with 1 gallon of hi-test
6- loosened airbox screw and pulled back so i could push rubbers into airbox so I could spray a can of carb cleaner into the carbs and let sit over night with choke pulled to slow evaporation
7- next day i drained the carbs again with screws then sprayed carb cleaner up through drain hoses the closed screws again
8-now i opened petcock and let drain into carbs and let sit another night
9- trimmed plug wires at the coils by 1/4 inch and re-attached
10- measured coils for my 2.7ohms
11- try starting and feel exhaust for 4 hot pipes
12- not i replaced 4 plugs for standard DR8's gapped at .028
13- at this point it fired up on all 4!!! (as opposed to the 1 at 1st)

now fresh oil/filter and i ride....I plan to ride her to the local vintage bike guru this spring for a full carb remove/clean/renu/sync!!! for a full season

[shinyribs]

Nice looking bike! Good job bringing her back to life. Welcome to the forum.

[LukeM]

You didn't luck out. You did a regular maintenance on the engine. Plugs, wires, carbs, fuel lines, all according to the book. A few more things that might help: check the tires for cracks or aging, adjust the cam chains, adjust the valves, and sync the carbs.
I had the same model as your bike (CB750L). It's a rare machine.  Consider that if you're planning to donk it out, or do the cafe thing.

Congratulations on getting the bike running.  Now enjoy yourself, and ride safely.
Luke M

"Old bikes rule.  Just that simple."

[fordsparky]

thanks, and yes I've been prepping to do cam chain tension once I decide to do it via engine running method or hand crank (leading towards running) reading reading reading then decide

[fordsparky]

i also posted video link to me revving engine http://honda-cb750-s.456789.n3.nabble.com/1979-CB750-Limited-DOHC-td4044851.html

[free2ride]

yup, a beauty bike