Tech article by Mike Kipper (Kip60)
I purchased a mostly original 1970 Sport last year. It didn’t run when I got it. Started with rebuilding the carburetor. Finally got it to run, but a little rich. When I removed the carb, I noticed the heat riser pipes attached were rusted out at the connection to the exhaust manifold. Since it still ran, I chalked it up to extra old stuff and started another project.