A little OT, but I couldn't resist. That would be the Martin Adams Commonwealth Racing team RS850 race bike. A pumped up Honda Racing RS750 engine from their flat track racing foray, in a custom Caffrey built frame. I rode back in the crash truck with Lewis after he crashed the bike at Daytona in 1987 (or 1988?), having crashed my Norton in the same practice session. He was really worried that Martin would be highly pissed that Paul had crashed his shiny, new race bike, and he was right. A street bike based on the RS750 engine would have been pretty cool, but I've never seen one built.
The bike in final form, freshly painted:
View attachment 81020
And in an earlier version, showing the engine in more detail:
View attachment 81021
Ken