you can buy an av10 bottom end for 43 euros from rcv-team.com
and since anyone going for the av10 is going for a kit just order that at the same time, and if your on a $$$ crunch use a good condition av7 crank and get new bearings too, brand new av10 with kit for the same price as a heavily used on on ebay.fr
u can use av7 points and an av7 variator (use all 3 balls or the crank will snap) as long as u mill the edge of the plate down on it (or sand on a block for along time)
hear is my idea of the cheapest way to enter the av10 game today assuming u got an av7 already:
buy the new cases 43 euro, buy performance reeds 12euro (cheapest), buy a 15mm curvy av10 intake 9 euro dellorto 15:15 29 euro sorce a good av7 crank with good bearings or use yours, buy seals at the bearing shop $10, use av7 points on the av10 cases, and the av7 variator, use the stock pipe, use the av7 cylinder with a piece of steel bolted over the intake.
93 euro = $130 + $10 seals $140 plus shipping $40 or less probably so for $180 your bike is now runs on the av10 base. and has a dellorto 15:15 take that away and run the gurtner for $140 shipped
you could ride this bike forever with this setup it won't go any faster than your av7 but it would be ready to upgrade wenever you get some cash on hand.
ps the leovinci pipes are nothing but trouble unless your creative in mounting them to av7 and 50v frames and for the price the ninja is much better. also the ball joint system on the leo's strip stock cylinders hella easy they are not well designed, and slower overall.
however the ninja on my 40 hits the ground all the time and has finally wore a crack thru the seam, also the baffle has exploded and the ball joint leaks, all of these things happening has to do largely with the overal neglect of my bike and the pipe, it was mounted loose and i did not know for over a month and that rattled apart the baffle and the ball joint, extra springs should fix the joint, the baffle i fixed with ahose clamp done, and it slung too low on the 40 with the stock mounting brackets to really be safe. My friend allens on his 50v however is honding up great and has no problemes at all yet,
peter you should swap with his at sac mine is literally almost in pieces