Question about crank noise

[Jab458]

Hi all,

I recently built my engine, having replaced the crank and connecting rods with one out of a donor.

When idling low, the crank seems to make a decent amount of noise. When building it, I did check over the bearings and crank, and found that they met spec for wear.

I’ve linked a video of it running and am hoping to get an opinion or two on the sounds. I understand these are noisy machines but learning the threshold of which has provided me a lot of stress.

Pretty new to it all. If it needs to be rebuilt again so be it, really just looking to have fun wrenching and learn.

 

[Jim]

I understand these are noisy machines but learning the threshold of which has provided me a lot of stress.

That's it in a nutshell. I didn't hear anything in the vid that would cause me concern.

 

[Jab458]

That's it in a nutshell. I didn't hear anything in the vid that would cause me concern.

Thanks Jim, that’s great news. Appreciate the reassurance!

 

[Jan_P]

Cant hear anything either mechanical sounds
But it is not running perfectly 100 % even there Ignition timing check and carb synchronization would be a first if want it perfect.
But is minor perhaps not worth chasing but the strobe light check is quick and something I would do.
A bit more rev would give more info

 

[Jab458]

Cant hear anything either mechanical sounds
But it is not running perfectly 100 % even there Ignition timing check and carb synchronization would be a first if want it perfect.
But is minor perhaps not worth chasing but the strobe light check is quick and something I would do.
A bit more rev would give more info

Ah, yes. This was in the middle of doing timing and a synch. Keep wandering away so I’ve been needing to service frequently.
Has also been sitting for a bit and the battery isn’t super charged, always makes it idle worse.

 

[Its been a long time]

It will pay dividends to check the battery is charging properly too. Just use a multimeter on the battery terminals. Check voltage at tickover and revving the motor. Tell us what you see.

 

[Jab458]

It charges what I’ve decided is good enough for now. At idle it’s just shy of 12, up around a few thousand rpm is reaches ~13.5.

 

[Jab458]

It just so happens to have been sitting a while. In general it runs like a top, much has gone into it

 

[Wagner73]

It charges what I’ve decided is good enough for now. At idle it’s just shy of 12, up around a few thousand rpm is reaches ~13.5.

Yeah, not really charging well at all... should be at least 13V+ at idle and 14V+ at 3000 rpm.

 

[Its been a long time]

Yeah, not really charging well at all... should be at least 13V+ at idle and 14V+ at 3000 rpm.

This ^^^^^^

 

[Jab458]

Totally, just working through what I can when I can. It’s on the to do to install something better. Appreciate the outlook!

Yeah, not really charging well at all... should be at least 13V+ at idle and 14V+ at 3000 rpm.