How can you tell if you have a gen 1 or a gen 2?????

That would be the website VP Pro?
I tried to register there but there was no option to select for Spain, they only seem to ship to US/CAN/MEX.

Bit of a shame really, so I dunno what to do now.

Yeh the vp pro website. I did notice on their website that they don't seem to offer international postage but they do sell some stuff on ebay. You could try and contact them and see if they will help you out. You might also be able to get your hands on some o.s. 21j carb o-rings in spain. I think the seller rchobbies4life sells part JX05012. They are the o-rings for the mugen ninja jx21b01a(which had an o.s. carb) and should fit but not sure. They are about $5. Also the seller on ebay mikenixsos has the o-rings for the arrow for $10 but doesn't say if they are gen1 or gen2.

Did you see if your bearings are loose?

Ok my LHS has 2 of these motors in stock and looking at grabbing one how can i tell if it's a gen2 not gen1?????

Here is one way to tell if it's a gen2 engine.

Here is a pic.

Guys, it turns out that even though the auction showed a picture of the Gen 1 engine, the package I received did in fact contain a Gen 2 engine.
I'm thinking this seller should update his pictures, so that people are not avoiding his auctions for this reason!

So from dispair I have instead moved on to joy, just goes to show you should never assume the worst lol!!!!

Thanks guys for that can't wait to start running this motor going to be fun

If it fit, wonder why this guy wants to put a xzb rod inside a Arrow. It should be the other way. Arrow rod is way cheaper than a OS. Looks it's a + for OS owners.

The XZ rod is significantly lighter.

I just put a P/S/R in a ninja i had laying around. So far after break in I'm really impressed. Holds a great idle, LOADS of bottom end and still screams top end with temps staying in the 195 to 215 range w/OS 2060. IMO the VZB has little more top end and little less bottom end(very little though and temps are still running low so it could be leaned some more for top end but it definitely has more bottom punch and I'm running steel flywheel). Bottom end feels so strong on this motor I may try it in my truggy.

I didn't pay much attention to its weight. But $19.00 vs $46.00, I go for Arrow. Way cheaper.

the Arrow rods aren't built to the same tolerances either. I was changing out the rod in my VZB limited edition last weekend and the OS rod that is worn was a better fit than the brand new Arrow rod.

was the crank wore. because i couldnt tell a difference when i compared mic'd it

I don't for sure. But my friend did get a psr replacement to fit his OS and find nothing wrong.