Reply To: ?????? Question Johnson QD-16

[tinkerman]

Ok so I see my mistake on the reed valves, as their behind the carburetor. How would you know that they are sealing correctly? There was a lot of oil or really thick gas back behind the carb. On the compression gauge IDK I checked it on the QD-16 after it had ran a bit and it went from 50 up to 60. I know it’s a cheaper one but the one I saw at nappa wasn’t much different just a shorter hose but they wanted $80 for it. I’m a plumber by trade and we build our own test rigs for different systems we install and hardly ever is the gauge flat out bad. Like I say this engine , you can tell by the pull rope compression is weak. My question I guess is weak compression ALWAYS worn rings-piston or bore? Are there other common worn components to be on the look out for? 2- strokes are new to me. I’ve rebuilt chevy v-8’s and a Kohler k-241 mower engine which purrs like a cat. I just need pointers on where to start with these weak compression engines. Someone on here said the QD-16 at 60 was real low, so I’ve kinda quit on it cuz it’s running like crap and I feel like I’m spinning my wheels trying to get it to propel a boat and run consistent with the compression at 60. On the scot Atwater I’m gonna see if I can get the compression up BEFORE I do anything else.

It's a jungle out there.