86 305 won't start. Ideas?

[MWS1994]

Here's a video of the carb backfire. It doesn't do it right when I start it up, but starts after a couple minutes of running.

 

[MWS1994]

So I took the driver side valve cover off. Does this look normal? I've never taken a valve cover off but they don't seem like they're moving much?

 

[Jeff L]

If I am seeing it correctly, the valve closest to the firewall is not even moving. The last one seems to be motionless from what I can see of the rocker arm. I am trying to see this on my phone so I apologize if I am seeing it wrong.

If that valve is not moving then some of the quesses of a worn cam might be right on. Could be a bad valve stem, valve spring.

 

[MWS1994]

I was trying to upload this video but it wouldn't load. It definitely is loose

 

[Texas82GP]

It doesn't look like it is moving to me either. The backfire sound is not what I expected either. I think the cam might be wiped.

 

[MWS1994]

Can I just tighten it up some to see if the backfire will go away? Or will that hurt the engine more?

 

[MWS1994]

It doesn't look like it is moving to me either. The backfire sound is not what I expected either. I think the cam might be wiped.

Yes, it is loose (see video in the post right above yours).

 

[406 Monte]

I'm guessing the lobe is gone, no tightening it won't do any good

 

[406 Monte]

Well you could probably tighten it up don't think it will harm it any more. What I've seen is you get a crater in the bottom of the lifter

 

[406 Monte]

Looked at video again and man it is really loose so it may not tighten up before you run out of threads on the stud