Yz2 --yz2ca
 

Has anyone worked out how much the parts are to convert the standard yz2 to the yz2 carpet/astro ?

about £30 to try the gear box MB have a kit in

NMibosport lists the following new parts:
If you already have the Yatabe springs and converted to the wide rear end, the 3-gear set Z2-302C3 should be all you need, except maybe the LW body. If you have issues with the steering bearings, the new bellcranks will solve that.

The new chassis is different, the rear end is narrower to accept the narrower wishbone hangers from the YZ4 as an option. It also has the holes to accept the Dirt 3 gear gearbox. The chassis side pods are different, again matching the new part of the DT car.
The alloy steering cranks are a newer design to accept the 5x10x4mm bearings, an improvement over the original with the smaller bearings that wore out quickly.

Anything else, most will have upgraded their current YZ2 to anyway, I'd have thought.

Just trying to work out if to buy cheap 2nd hand yz2 and up grade or just go for new yz2 c/a ??

I'd just get a fresh one and build it.

+1
I am really happy with my upgraded YZ-2 and will get the new gearbox in the next few days, but I see a full CA kit on my desk before long. Unless you are on a really tight budget, I'd say get a kit with fresh bearings, seals, wings and body instead of bothering with replacing these items soon after buying the used car. In the long run, buying a second hand roller may not be much cheaper unless you get a really good deal on it.

Longer Ca rear arms vs standard arms? What does they do exactly? Better on high grip?
My point being. Is it worth getting the CA if I am mostly running on medium to semi high traction?

yes the wider rear end is better on higher grip. To be honest I've been running the wider rear arms on low to high grip and have found it excellent. I've not run the kit arms for a long time.