https://www.taffmeisters.co.uk/product_info.php?products_id=2663
I do this kit. Although I was nervous at the beginning for the 550, i knew it was good for the 501 for sure but several bought it as a last resort and they have been fine. I should have guessed that anything Honda make will be up to the job!
I have only 6 pins left ......for 6 rod kits and then that is it. The guy that made the eccentric pins died shortly after making them, the business folded. I don't want to have 12-20 rods made as the likely return before I close is slim.
Cheers
Taffy