200A and 202 reproduction
frames back
in stock.

A 4/37 242B burner run on RUG gas for last 5 years, runs perfectly.
It's my go to emergency lantern, The poor girl has never failed me. However I find flecks, sometime pieces of rusty iron on cage floor after every burn. The burner is slowly wearing away. Not sure if RUG additives are responsible? Poor metal casting? Material failure? I don't know if RUG burners hotter than CF; then again there was no CF in 1937. Never seen this. Lantern operates flawlessly, anybody. Thoughts?burner.jpg 
You've done well to run R.U.G. and not clog your generator often.
And yes , additives contribute to crud build up from burned fuel. Not unlike looking at sparkplugs removed from an engine and seeing sandy looking reddish /grey/varied sandstone colored grit on some.

A citric acid bath (warn half gallon of water with a tablespoon of citric acid for example) and a toothbrush or similar will clean up a lot of that crud.
Do check the frame often while soaking it. About 15-20  minutes, test with brush . If it's ready for crud removal have at it.
If it's still bad soak it a few more minutes. Brush it to see how well it cleans up. If it needs more soaking , give it a few minutes more Ect.

Cola has citric acid. Weaker than using straight citric acid, but in a pinch ,try it.
Using either ,rinse well after brushing to clean. Hot water dries faster.
I used a mild scotchbrite type scrubber on the air tubes of my 242.
Purty colors. Well , cept'n maybe that brown when it's on fire...
Also, the gasoline back then WAS CF - AKA White gas,  AKA Naphtha  Lead and other additives to make hi octane gas was mostly post WWII.
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Thank you for your great suggestions; but its more than crud, it's actual iron pealing off! I have not seen that before.
Just my thoughts but no proof but I have several that have run several of a similar vintage on CF and had  nothing like the decomposition you are showing.  I would suggest it is the RUG attacking the metal.  Your current RUG is not like the regular gasoline of 1937, many more additives and much more caustic.  CF is more like the  fuel of the day.   I would also be afraid of an aggressive acid soak and scrub as far gone as that looks.  You may want to start looking for another burner.  
Carlos wrote:
Thank you for your great suggestions; but its more than crud, it's actual iron pealing off! I have not seen that before.

If you are going to save it , clean and neutralize it. Stop the breaking down process.
I didn't study my mixing chambers scaly deposits. Figured it was more soot than anything.
It looks like a crude casting after clean up.
Didn't study that well either to tell if it was sand cast. Or a worn mold. Or dirty metal poured ect. Heck , it works....
Purty colors. Well , cept'n maybe that brown when it's on fire...
Are you sure that is an iron casting. Weren't they brass?
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Northman49, you hit the nail on the head, the burner is indeed brass
so the flakes are RUG additives turn into solid hard rock, I started to pick at the burner crud and brass appeared underneath. The screen was gone, destroyed by the RUG.
Gas must be murder on small engine pistons.
The brass appears irregular and not smooth at all; I'm trying naval jelly to see if the remaining crud clears up. Additives are caustic and attack the brass
I'm going to burn a couple of tank fulls of CF to "season" the burner so to speak, this has to be dedicated to RUG, an emergency go to lantern. If no CF can be had.
So what about non ethanol gas? Still too many additives? Is this crud actually because of all the added ethanol? Back in the 70's and early 80's I used nothing but unleaded gas and never had a problem....just getting back into it and don't mind spending on lanterns but didn't want to go crazy on CF... guessing they go hand in hand, huh? Maybe I should just collect kerosene burning lanterns......hmmmm or convert some  to kerosene...there's a thought😏
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