1977 CB750F Not Starting post Air and Oil Filter Change.

[mluk1]

I changed the Air Filter and Oil Filter of my 77' CB750F and it won't start anymore. When I kick the kickstart down it sounds like I'm pushing air and nothing is catching.

I've read somewhere that the Air Box might need to be vacuumed sealed in order for the Bike to start?

Anyone have any ideas?

[Re-run]

The 77 does not require any fancy airbox things. What all did you do besides change oil and air filter?
If nothing else, I suppose it may be possible that the bypass spring for the oil filter might be stuck but neither of those should prevent starting.
Do you have lights and such? Now for the dumb one that we all have done at one time or another, is the kill switch set to run?

[mluk1]

All I did was change the oil filter, oil and air filter. All the lines are reconnected, the choke is on, fuel is on, the kill switch is on run, the lights and signals all work. I know it's just one little thing but I can't figure it out!

[Re-run]

What brand of filter did you put in? Air filter that is. And what type of oil filter? Are you using the stock housing or a spin on?

[mluk1]

Everything is stock. I got the Oil, Oil filter and Air filter at a Honda store.

[Re-run]

I cant think of anything that should cause this, at least nothing with changing oil and filters. So I will toss off a couple things to try. There are no safety features that kick in with low oil pressure or anything like that.

How much oil did you put in? The average change ends up being about 3.5 quarts but not all at once. You have to spin the motor and get it to sump, then you can fill more.

Do you still have the electric start? What happens when you try to start with that?

Check the wires that run from the points, or whatever ignition you have, to the coils. Possible that pulling the airbox off may have yanked them from the coils or ignition unit.

If you can, try to put in different fuses and clean the terminals on the holders. the glass fuses can go bad and sometimes you cant even tell.

Is fuel getting into your carbs? Hook 4 pieces of clear tubing to the drains on the bowls and angle them up. Open the screws and see how far they fill. Should fill to right around the top of the bowl or so.

You can also turn off the gas and lay the plug leads on the head and turn the bike over to check for spark. If you can get spark, then there is a good chance it is fuel related.