hey guys I was wondering if there was a way to replace the main bearings without having to remove the crankshaft I'm already going to do the rod bearings as I noticed there was a noise and I can feel a vibration on the top of my motor so I checked the clearances in my rod bearings and I'm at about .050mm which is right at the top and of the acceptable range and that was with a new bearing I thought when I was in there I could do the crankshaft main bearings but I didn't want to take it out I'm going to use standard size rod bearings because I used 20w50 oil and that would be too thick to use undersized bearings that was the oil I was using previously as well and only noticed the noise when I switch to 10w30 any help would be great and thank you again for your time

well since no one knows I will try it and see what happens I guess. wish me luck my dudes

Anything is possible with a big enough hammer, but you're not doing yourself any favors.

I wouldn't even recommend swapping out rod bearings like this.

Agree with Dino.

If you cannot afford to do it right the first time, be ready to pay to do it twice then.