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Sounds like a problem the factory had during development of the 908 race car with starters ... way back in '68!!!
Is it a SR-17 , or a SR-68 starter (0.8 hp or 1.5 hp), or do you know?
it sounds to me like the starter has a build-up of rust, dirt, or a lack of good, moly lubricant, causing a 'marginal' hp output, exasperated by a good 3-hour heat soak!
My suggestion is to remove, disassemble, clean, and lubricate the bendix mechanism, and solenoid linkage with a premium moly grease. What I tend to do every 3-5 years, whether symptoms appear or not!
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Warren Hall
1973 911S Targa
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