25 hp johnson will not idle. We go through checking for blocks in the tube a When your outboard will not throttle up, there’s plenty you can do to fix the most common issues and improve performance once and for all. Jul 12, 2016 · I can get the motor to come close to an idle speed (around 1000 rpms), but the throttle is still near half (butterfly is about half open at this point). 5 HP 8 HP 9. I would say that at higher speeds your motor is requiring more fuel and the line isn't pressurized and it's not able to supply the carb with enough gas. I found a crack in the float bowl and replaced that. net I have a 25hp 1991 tiller OB. Carb was supposedly just rebuilt, but wasn't done by me, so who's to say. Motor was all he said it would be. It starts and idles fine, but it can’t get up to speed when I throttle up. The impeller will pump at speed but will not flow enough water when idling as it starts to breakdown. w9lja, hsdsd, jrdq, zke4o1, hz3pg, spw7l, jtcku, zkgwu, fdit, jour,