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Just curious if anyone else has any experience with the Big Boy in regards to increasing the BTU. Mine runs great, but could use a bit more heat to get the PSI up during the run. What size gas jets did it come with? Thinking about increasing the jet size first.
 

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I have found the same but for mine it’s the gas tank getting cold, I have ran a warming line back through the feed pump return with a fine needle valve, just keep the tender water tepid it makes a big difference
 

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Just curious if anyone else has any experience with the Big Boy in regards to increasing the BTU. Mine runs great, but could use a bit more heat to get the PSI up during the run. What size gas jets did it come with? Thinking about increasing the jet size first.
You might try contacting Channing at Accucraft/AMS.
 
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