1985 250sx clunking noise from motor

[Damien90]

I've had this 250sx for about a year now. Never any problems. Road it on the open road topped out for a good few stretches and now it's making a clunking noise when I start it up, but goes away when I give it throttle. Any ideas what it could be?

[TrickShot]

Valves adjusted correctly?

[Damien90]

As far as I know. Yes. I've riding it a lot prior and never any problems

[Damien90]

It seems like the lower left side of the motor. I'm going to pull it out tomorrow and have another look st it

[3 wheeler guy]

Sounds like the connecting rod bearing to me

[Damien90]

Okay so I pulled it out again yesterday and it's definitely bottom right side of the motor (kick start side). It shifts fine. The case would vibrate as i gave it throttle. But that when I trailprotrailprotrailprotrailpro it off. The whirling sound gets louder. And it won't start with the electric start like it use to. I took a video of it yesterday. Not sure if I'm able to upload that on here

[Damien90]

https://youtu.be/fqj3u9QB9II

Here's the video of it