We own a 1995 19.5' bowrider Larson with a 175hp Johnson 6 cylinder and the shifter won't shift. The motor starts and idles normally but shifting doesn't happen. The mechanical linkage to the motor is visibly shifting on command but the motor makes no attempt to slip into a gear. Two days ago it drove normally. I'm new to boats but not motors but it's looking a lot like chinese to me. Any help would be awesome, thanks!