[Sr412]

I'm new on this forum sorry if this is a repost but couldn't find what I wanted with the search.

Firstly I'm going to rebuild the engine next week mainly for peace of mind ready for the winters green laning.

The biggest reason for prompting this is I have a fair bit of end float on my crank not up and down like when mains are worn but more in and out. The flywheel pulls in and out about 3mm. I'm certain this isn't normal!!

And finally where is the best and cheapest place for rebuild parts?
Piston
Conrod kit (cr250?)
Gasket set?
All bearings and seals will come via my trade supplier I use for bearings at work.

Thanks in advance