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SOHC.co.uk Forums => CB350/400 => Topic started by: rustywheels on June 23, 2020, 09:52:50 AM

Title: CB400F top rear shock mount corrosion
Post by: rustywheels on June 23, 2020, 09:52:50 AM
Was cleaning the bike after an evening ride (aren't the evenings amazing at the moment and were the headlights really that dim back in the day?) this week, and I noticed a small amount of corrosion on the frame.  Its the 'triangular' top mounting point for the near side rear shock.  Not horrific, but obviously a stress point.  Has anyone repaired this area before? 

Is it best to fabricate a new mount or use an off-cut from an old frame (anyone have such a thing hiding in a shed?)?

PS there are definitely more insects around following lock-down.  My jacket and helmet are literally 'furry' at the end of each evening ride

Title: Re: CB400F top rear shock mount corrosion
Post by: bobv7 on June 23, 2020, 12:18:53 PM
Dunno about your rusty bits but change the headlamp for a Cibie one if you want to see where you're going.
Title: Re: CB400F top rear shock mount corrosion
Post by: GregShiv on June 24, 2020, 05:41:43 PM
I had mine repaired and it was only after the frame was blasted to remove all the old paint and rust that some of the rust damage could be seen. I took the frame to Maidstone Motorliner who carried out the repair. The 'Triangular' mounting point for the rear shock was cut out and a rust hole formed by water getting trapped between the frame tubing and the shock mounting plate was repaired , the also remade the triangular plate and the shock mount threaded portion. The frame and exhaust mount also needed to be straightened.
Title: Re: CB400F top rear shock mount corrosion
Post by: rustywheels on June 25, 2020, 10:28:11 AM
Thanks for the replies. and the pics.

Looks like an excellent job on the frame, so I will give them a call to chat it through as suspect my welding skills aren't at that level.  I think it will be a winter job, as I don't want to take it off the road at the moment  :), but will keep a close eye on it.
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