scout-j-m
Chief Petty Officer
- Joined
- Jul 31, 2009
- Messages
- 642
I recently picked up a nice little 1992 Johnson 9.9 hp with a 15 hp carb. I have a couple of the same motors from the early 80's with the gear/teeth throttle control and the side idle adjustment screw but this one has the cable system (which is one specific reason I got this one). I received my factory service manual in the mail a few days ago and have read through it. From my interpretation, the manual seem to contradict itself on the idle adjustment. In an early section it states to adjust the forward idle by adjusting the trunnion ball on the cable system, which pops into a space in the lower cowling below the recoil starter. However, in a later section relating to the tiller handle, the manual states to use the idle adjustment piece on the end of the tiller handle.
From the little I have toyed with it, I have found that the adjuster on the handle is too fine and has too little range to accomplish this. It seems more like a fine tune adjuster for after you adjust the trunnion ball to get you in the ball park or to adjust your trolling speed faster for going againt current or something. I've also found that using that adjuster decreases the easy of motion of the twist grip. Should I proceed with adjusting the trunnion ball first to get a low enough idle and then use the tiller handle adjustment as necessary? My only fear here is that I totally get the cable system out of wack and it mess up things like making sure the timing plate opens all the way up when the twist grip is at full throttle.
From the little I have toyed with it, I have found that the adjuster on the handle is too fine and has too little range to accomplish this. It seems more like a fine tune adjuster for after you adjust the trunnion ball to get you in the ball park or to adjust your trolling speed faster for going againt current or something. I've also found that using that adjuster decreases the easy of motion of the twist grip. Should I proceed with adjusting the trunnion ball first to get a low enough idle and then use the tiller handle adjustment as necessary? My only fear here is that I totally get the cable system out of wack and it mess up things like making sure the timing plate opens all the way up when the twist grip is at full throttle.
