Home › Forum › Ask A Member › air cover on ’68 Johnson 20hp – needed? › Re: air cover on ’68 Johnson 20hp – needed?
You are correct, trying to do a perfect job with sloppy linkage can be a waste of time. But, you can usually "adjust out" the slop by advancing the pick up a little bit. In other words, you may see the carb linkage starting to move before the cam line bisects the roller, but the carb isn’t actually starting to open until the cam bisects the roller.
I don’t ever remember hearing of an older engine like yours with an intial setting of 1 turn out, but sure could be mistaken. What manual are you using? And yes, some of those throttle cams are very strange, very little throttle opening until almost the end of travel. 115-120F is plenty warm enough for this engine to run normally, so I would ignore my advice about plugging up the thermostat bypass in the head.