SOHC.co.uk Forums > CB350/400

Throttle cable stiffness

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McCabe-Thiele (Ted):
I thought the guide eye is just for the clutch cable.

Oddjob:
I thought the guide eye was for the clutch cable?

Check the back of the workshop manual for the 350/400 in Ashimotos Dropbox, there is a cable routing guide at the back, iirc, the cables go through the speedo/tacho bracket hole, down around the left side of the headstock and pass through the hole in the frame where the coils sit. Throttle cable routing is critical on the Honda fours, get it wrong and the cables wear against the frame and the action is a lot heavier than it should be.

If taking the cables off in order to reroute them I’d suggest removing them entirely, hanging them off a door and dribbling some silicone oil down the inner cable, not engine oil, must be silicone as that won’t cause the Teflon lining to swell and make them bind. Get it right and pulling the inner up and just letting go as they hang from the door and the cable should just slide down under its own weight. Check the outer cable for damage at the same time. If you find a part of the outer that shows it’s scuffing against the frame cut some fuel line if you have any spare longways and fit it around the cable so the fuel line rubs and not the cable. Protects bothe the frame paint and the cable.

Nurse Julie:

--- Quote from: McCabe-Thiele (Ted) on February 11, 2023, 05:46:31 PM ---I thought the guide eye is just for the clutch cable.

--- End quote ---
You are correct Ted, it is for the clutch cable, not throttle cables. The throttle cables go through the guide attached to the horn bracket.

Oddjob:
Just checked and that routing was for the 500./500. The 400 has them going under the clocks, coming down the right side of the headstock, through the wire clamp fitted near the coils and then to the carbs.

Multiman:
After fitting the carbs back on the throttle stiffness is better but not perfect.

I've got some brand new cables so I'll lubricate with silicone lubricant, hang overnight and experiment with cable routing to see if I can improve things.
As they stand the cables are super free so fingers crossed

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