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The Thor models share a common design. The info below is unique for the 190. Please see the Thor all models section for info that is not found here. The Top 80 section has detailed info on things like the carburetor function and tune up (used by all Miniplane and Polini engines), and troubleshooting issues.
Flash starter – The Thor Flash starter has serious problems. Here is the best fix for it at this time.
Parts diagram w/o clutch or electric starter
Parts diagram w electric starter w/o clutch
Spark Plug – NGK B9ES, gap 0.9mm (0.035")
Specifications are in the "User & Maintenance Manual" below. Many specifications are similar to the Top 80.