Re: Johnson HD-20 Won’t start

[aquasonic]

Thanks to Garry for posting this service information. I think he posts this a couple of times a year, and every time it seems I learn something new. Reading through this, you can get a good sense of just how important it is to have a properly functioning check valve, otherwise the low speed circuit won’t work well at all.

These check valves have a tendency to get gummed up and stuck from long periods of non-use. I’ve had good results freeing them by soaking in acetone overnight, then gently tapping them on the bench, blow out with compressed air, and repeat as necessary. An ultrasound would be helpful with this also.

Improvise-Adapt-Overcome