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I've been having trouble controlling my CHTs on climbout lately, so I went back and checked my engine logs. Max fuel flows are around 25.2gph, but SID97-3E says the range should be 25.6-27.3. I want to increase the high end fuel flow using my fuel flow gauge (which is accurate to withing 1%). I found the "adjustable orifice" but I can't figure out what kind of tool to use. It looks like a Torx screw but I tried T-10, T-15, and T-20 and none of them fit.

Does anyone know what kind of tool to use on that adjusting screw? Is there a cap screw that has to be removed first?



Thanks,
Adam Molny

I used an Allen wrench. I think it had the ball end on it so it could get a grip as the wrench goes in at a slight angle


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Here’s from the SID97-3G which has been superseded by the M-0. It’s too hard to find in the M-0





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A 5/32" allen wrench did the trick, thanks. A 1/2 turn increase raised my fuel flow to between 27.2 and 27.5gph at takeoff power so I'm satisfied with the result. The idle RPM increased a bit so I backed off the idle stop screw, and will play with the idle mixture screw if necessary.

Thanks again,
Adam Molny

Glad it helped Adam!

Remember changing one adjustment requires re checking the other two parameters as they are all tied together


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