Bad bearings? Or is this normal?

[vinver]

Today's little task was preparing the mainshaft with the bearing blocks, collars, etc, but I find both main bearings are notchy, the lower bearing is part of the upgraded tail drive assembly. The upper bearing also is cocked in the block (one side is a couple thou proud of the block, while the other side is flush with the surface). I really don't want to assemble it this way, it goes against all good judgement. My :?: is, is this normal, common, or did I get a bad set of bearings? Are there any better options than the Chinese ones in the kit? Any suggested brands? All mine say is L1910Z China.
Thanks,
Vince

[cbergen]

Not that it would make any difference in the bearings, but how old is this kit?

When and where was it purchased?

[vinver]

Hi Chris,
I bought the kit off e-Bay, you thought it may have been one you donated to a fun-fly as a prize, the seller was selling it for a friend. It is an Intrepid 90 with 12 tooth pinion (as per the label on the box). Most of the parts were sealed in heat-sealed bags, only the tail rotor gearbox assembly was pre-assembled .I'm not sure how old it was before I bought it, but it came with the upgraded tail rotor drive assembly, and the main shaft bearing in that block is notchy too. Or maybe I'm being picky, but a notchy bearing is a notchy bearing, maybe a defective batch? For ten bucks I don't plan on assembling it as is, I'd rather be careful now during assembly.
Can you tell me what the difference between a L1910Z and L1910ZZ bearing would be? Both seem to be 19x10x7mm if I'm reading the numbers correctly, the Bergen part number is 3040 from the parts list.
Cheers,
Vincent

[cbergen]

Ok, I beleive this came from the Ohio funfly.

I agree, better safe than sorry. You can either send the blocks back to me( I would like to see them anyway, use them as an example.... :( ) and I'll put new bearings in them, or you can replace them yourself.

Easiest way is to heat them in the oven, the bearings will fall out with a small tap, install the new bearings and march on.

[vinver]

Ok, I beleive this came from the Ohio funfly.

I agree, better safe than sorry. You can either send the blocks back to me( I would like to see them anyway, use them as an example.... :( ) and I'll put new bearings in them, or you can replace them yourself.

Easiest way is to heat them in the oven, the bearings will fall out with a small tap, install the new bearings and march on.

Guys, here's a great example of what I like about Bergen.. how many CEO's of any company would offer to repair their product themself? In a product as intricate as this, there's always going to be some issue, glad to see the manufacturer stand behind it's product. And this from a kit that was given away as a donation, as Chris and I discussed, better for it to be in the hands of somebody who will build it and fly it and spread the word, than sit in a box where nobody will see it.
Thanks Chris, I'll be in touch soon.
Cheers,
Vincent