Bilko

Drops into the gearbox try and drain. hopefully it will come out with the oil.

https://betausa.com/content/SUPPORT_PDF's/2018 evo 2 stroke owners manual.pdf

Try Splat Shop plenty info there.

Iv'e looked through parts manual for your bike can't find anything like that.

Stator, common problem with the rev 3's but saying that iv'e had 5 and never had a problem

Adjuster at the top as pic

Iv'e have a 2009 250 Evo 4t love it.my son has 2018 Factory 300 4T his is ridden every week -end.we never had a problem with eiither.He has just ordered 2020 Factory 300 4T .

Vin number should be stamped on headstock.and the 99 was a TXT

Try this guy on FB he has done quite a few.

Might be more info on site http://www.fanticmotor.asso.fr/r02_f03.htm

These are the size and type as listed in parts list from Beta if it's the front 2 O Rings https://www.polymax.co.uk/o-ring-52-07mm-id-x-2-62mm-cs-fkm-viton-brown-75-sha

Only Italjet i could find with twin tanks and 2 fuel taps italjet 50 mustang circa 1966/68 but not a trials

There's a Evo 200 on e bay but don't know what your budget is.https://www.ebay.co.uk/itm/2017-Beta-Evo-200-2t-Trials-Bike-Finance-UK-Delivery-available/293394506877?hash=item444face47d:g:sAAAAOSwxIleBLQH

No never seen a VTRTG this picture shows explains Codes

Well looking in the parts book looks like they have sent you the 125/200 middle box which is shorter. no 11 mid box is shorter BT120126020 .Should be no 12 BT280126020

Good source for info https://fantic240pro.pagesperso-orange.fr/ukindex.htm

If it's Fantic 240 your after 69x56,5 mm

Ok it's a Trial Registration Card

Need to join a club first to get a number for you to apply for acu licence which is £12 for yr

Don't know if this is any help to you.

https://www.apriliagenuineparts.co.uk/catalogue-climber-280-19901994-17.php

Don't know if this is any good for you,https://www.electrexworld.co.uk/acatalog/STK-109D.html

If you click on the pics they in large https://2bbikes.com/models