Handy four-wire spark checker for small engines. S48H is half of S48 DeluxeSpark Checker. For Safety Concerns, See CDI P/N 511-9766, page 50. See CDI 1 cyl. neon tester 511-9764, page 50. See CDI 1 cyl. adjustable tester 511-9763, page 50. "Stevens Therm
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