It occurred to me that I have not provided evidence which highlight this bikes identity in one concise post, so here are the facts which...

The front forks were dry built to check fitment. It was a very worthwhile exercise as the chrome plating on the oil seal holders had...

After a long while, progress has once begun again on the restoration. I had become very dismayed and lost a lot of enthusiasm after...

All the cases were soda blasted & vapour blasted to clean and restore them to look as if they just came out of the sand cast moulds....

Apologies if you were following this blog ! It has been far too long since I have posted any progress on the YD-A restoration. Since the...

Upon closer inspection of the crankshaft removed from the engine, it was found that the crankshaft is the correct long stroke 54mm...

A dummy front end was fitted as well as a YD1 fuel tank. The machine is now going away to have it's proper fuel tank made as well as its...

With a bit of help from Chip Hellie in the US (who supplied me with the drawings) and Guy Pearson at Exactweld who did the excellent...

Here I have compared a standard 1957 YD1 production bike crank and conrod to that of a the YD Racer. It is quite clear that the 2 model...