Main bearing gone, Motoberg 650

Yeah I know one guy who can measure it for me, no big deal
but I usually try to do as much as possible myself.

How about the welding of the crank, how this should be done?
Experiences anyone?

Mains are going here and there, and I'm trying to get the big picture
right:usually left side, mainly SM or other hard usage and bitumen surface.
Lot of discussion of bearing types and loads they can cope with..in the end
of the day all bearings seem to fail quite quickly no matter what type or combination
used.

I'd like to know has anyone tried separate oil container/circulation in order to increase
oil volume, not oil level(won't stay in the engine for long)

LC4 engines that are very similar in power and size have larger volume and as I know last for ages.Can someone explain for me why oil volume is so damn small in bergs,
it would be very easy to increase that..weight saving possibly?

Now I have split the engine.There is roller on RHS and ball on LHS.There were no signs of wear in roller, but ball bearing plastic cage was completely exploded and all spheres were in one corner of the bearing .. this caused huge radial play mentioned earlier, this is also the reason why the crank has touched the clutch cover case oil channel surface.

There are 9 pcs balls in that bearing, can't tell the type yet because I was not able remove the crank from the case, need heat or proper pressing tools.Piston and cylinder liner have some damage but possibly are still usable.All the other parts of the engine are in good shape.

C/B is not there and propably won't be neither in future.Still, maybe I have to build better and more rigid "inner races" between crank and main bearing.

In my opinion, the ball should be on RHS and roller on LHS.

It would very nice to hear from weed how oil cooler affects..have plans to invest that one as well.

Pictures coming.

I have now added some photos of the main bearing failure to my gallery.Unfortunately I have been more or less busy with my work lately, so I haven't had time to participate any discussions, or even remove the crank from LHS case.Please,have some patience with this thread.There will be data later of the measurements(bearings ,crank and the cases).

By the way, ball bearings are pain in the *** to remove.

BR

Finnberg