Bill, I found that the scat tubing between the firewall and the inside duct was broken and the heat was lost outside. When replaced it helped.
John
John Hess
Past President 2018-2021 President 2016-2018, TIC170A Vice President 2014-2016, TIC170A Director 2005-2014, TIC170A N3833V Flying for Fun '67 XLH 900 Harley Sportster EAA Chapter 390 Pres since 2006 K3KNT
I've added SK 70A51-1 to the Mx Library. "The kit is to supply installation instructions and parts for the installation of Hanlon Wilson type exhaust manifolds and mufflers on the Model 170 and 170A."
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