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How to protect new exhausts inside?

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Moorey:
 
   I periodically put some 2 stroke oil in the petrol,

sprinta:
Thanks for all the replies and suggestions.

I removed the detachable end baffles and popped a bore camera inside, so this is what the new unused exhausts look like even before they have been used!

Last one is via the downpipe looking at the end baffle basket.

Might pour some rust converter inside to kill(?) the existing rust/corrosion and then pour in some: Oil, ACF-50 or what?

Has anybody had any experience of the Frost internal Exhaust Coating: https://www.frost.co.uk/ew-hi-temp-internal-exhaust-coating/

K2-K6:
Welding oxidizes the steel during manufacturing with that locally sited (along the weld sites) being fairly typical.

Saying that, they look particularly clean for the reality of the production process, and quite impressive from those shots of the quality of manufacturing.  You can see that the welding heat has travelled quite short distances from weld site, showing a decent competency of weld process.

Just an aside to any "treatment" liquids etc, check them on something else chromed first to avoid any impairment of the finish.

Lobo:
Wrt adding 2T to the petrol, no one’s yet commented upon the life expectancy of the bigger two-stroke bike exhausts. All those RD400 / GT550 owners - how do your exhausts fare / look internally?

Johnwebley:
I have a 1973 RD125,

the exhausts seem perfect

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