Carbs for a 650 in the Eurosport frame

Why it’s a question at all

Most CX500s have a single-spine frame, and on those the 650’s carbs don’t fit, so swap guides are full of carb fabrication. My Eurosport has the triple-backbone frame shared with the GL500, GL650 and CX650E. In that frame the 650’s own carbs fit.

So I have two routes:

• The engine’s own Keihin carbs, rebuilt, if they come with the engine and are sound.
• A Mikuni VM34 kit from Murray’s Carbs, or a Mikunioz VM34 or TM34 kit from Australia.

Which Murray kit

Murray sells three that could apply:

Kit	My read
CX650 in a CX500 frame	Probably built for the single-spine frame, not mine. The build manual picked this one
CX650E Eurosport	The 650E shares my frame family
GL650 in a GL500 frame	The GL500 is my frame’s closest relative

The fitment tags on Murray’s pages are ambiguous, so I asked him rather than guess.

Where it stands

Murray replied on 26 Oct. Before he answers he wants a photo of the bike and the final-drive bolt count (3 or 4). That tells him which family the drivetrain is. Honda’s shop manual for my bike lists three final-gear-case nuts, but I’ll count them on the bike.

What would change it

• Murray’s answer.
• Whether the engine I buy comes with carbs and intake rubbers. Intake rubbers differ between models, so check the part numbers.
• The engine choice itself.