I used both. I found Tom’s when I was putting them back together. I wished I watch Tom’s when I took them apart. D-Ray had good information in his also but I think Tom’s is more in depth. I sent him a message through YouTube and he got back to me right away.
D-ray operates a business fixing all type motorbikes, atv's, not only Valks and his videos he did eight years ago when video editing software wasn't as advanced or simpler as it is nowadays. I don't think he owns a Valk himself. I'd estimate it takes between 2-4 hours editing each video not including the hours it takes filming an episode.
True, Tom Asay separated the carb banks and that's is picking up where D-ray left off on Valk carbs. I surmise when Tom gets through, he'll end up video-ing everything that requires fixing on a Valk.