I have what is believed to be a 1991 25/30HP Johnson short shaft tiller model. The issue I noticed was that while running WOT it cut back to 50-70% and I no longer had top end. After swapping out new ignition coils (already had a set) I test ran it again with no improvement. I completed a spark test (blue spark present 7/16 jump) and compression test (110 and 105 or 105 and 100.....my age factoring in here). The research I found indicated to me I needed to look at the carbs. Well, with the motor not running, in gear, I noticed the butterfly in the carb throat only opening 1/4 of the way with the handle in WOT position. HMMMMMM!!!!!!! Upon further investigation I found a broken starter interlock cable bracket (325326). As I move the handle to WOT the nuetral start plunger (325332) does not allow the throttle cam to continue its natural progression thus keeping the carb butterfly nearly closed. So in short, I am looking to replace the cable bracket and once correctly aligned will see if the cam is back in action. Is there possibly something else that could cause the plunger not to go down another say 1/16th of an inch limiting the cam movement? Thanks all!
