Honda-SOHC

SOHC.co.uk Forums => CB350/400 => Topic started by: AshimotoK0 on March 20, 2026, 08:37:53 PM

Title: Infra Red image of 400-4 header pipes
Post by: AshimotoK0 on March 20, 2026, 08:37:53 PM
I went to my mate Paul's today (who rebuilds and sells 400/4 carbs)

I took this IR image of his 400 header pipes after starting Paul's bike and then ticking over for a few minute using my FLIR/ iPad combination. I bought this setup to look for hot-spots on some electronics I am designing for work ... but useful for bikes too.


[attachimg=1]

 
Title: Re: Infra Red image of 400-4 header pipes
Post by: Mikep328 on March 20, 2026, 08:52:16 PM
 Cool! 

But I'm too cheap/mean so I just put my hand on the pipes and if they all feel about the same, I'm good!!! 
Title: Re: Infra Red image of 400-4 header pipes
Post by: DomP on March 20, 2026, 08:57:35 PM
That's great, very useful for setting these bikes up i bet
Title: Re: Infra Red image of 400-4 header pipes
Post by: Laverda Dave on March 20, 2026, 10:32:57 PM
Reminds me of the rotary Norton exhaust Ash when it was being bench tested and glowed bright red.
Title: Re: Infra Red image of 400-4 header pipes
Post by: ST1100 on March 21, 2026, 10:12:47 AM
I bought this setup to look for hot-spots on some electronics I am designing for work ... but useful for bikes too.
BTDT (I'm in HVAC, got me a CAT S61 phone featuring FLIR...)
Diagnosed clogged idle jets on both rear cylinders of a '96 ST1100:

[attachimg=1]
Title: Re: Infra Red image of 400-4 header pipes
Post by: McCabe-Thiele (Ted) on March 21, 2026, 10:40:00 AM
Reminds me of the rotary Norton exhaust Ash when it was being bench tested and glowed bright red.

The later (one plug per rotor) NSU RO80 car had a warning in the handbook about not parking the vehicle on grass.

The catalytic convertor front pipe glowed cherry red despite all the heat shields there was a real fire risk.
Title: Re: Infra Red image of 400-4 header pipes
Post by: SteveD CB500K0 on March 21, 2026, 12:58:59 PM
I seem to remember the same advice for my VFR800. After the mild steel heatshield had rusted through and disintegrated.


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Title: Re: Infra Red image of 400-4 header pipes
Post by: AshimotoK0 on March 21, 2026, 07:00:22 PM
I reckon if I did a better scan the 400/4 downpipes image would make great wallart for a man-cave/den 🤣🤣
Title: Re: Infra Red image of 400-4 header pipes
Post by: Rozabikes Tim on March 21, 2026, 07:05:51 PM
Yeh. Limited edition prints for us SOHC sados. 🙃
Title: Re: Infra Red image of 400-4 header pipes
Post by: Athame57 on March 21, 2026, 09:14:13 PM
I wonder what one of my lungs would look like?  :o :o
Title: Re: Infra Red image of 400-4 header pipes
Post by: magpie114 on March 22, 2026, 08:40:13 AM
Yeh. Limited edition prints for us SOHC sados.
Would make a great piece of wall art!


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