Just got an engine kit in blue for my RZ350 motor - https://www.pro-bolt.com/aluminium-engine-kit-rd350-ypvs-race-spec-7.html - and a bunch of other titanium bits and pieces to put my RD/RZ hybrid together.
Not cheap, but not overly expensive either. Quality is first rate and shipping only took 2 days from the US.
Not cheap, but not overly expensive either. Quality is first rate and shipping only took 2 days from the US.