Collector of Junk
Cadet
- Joined
- Jul 14, 2012
- Messages
- 8
first post guys. been reading this forum for a long time. here is my current problem.
25hp tiller - went from running fine 2 months ago - to having a weird "pulse" losing RPMs at full throttle after running 20 minutes or so, then clearing up. i thought maybe junk in carb. cleaned carb. same problem but not a crippling problem. still ran "okay".
then it wouldn't idle to save my life. does a kicking sputter when at idle that will kill motor if i didn't have it revved. started to worry.
second to last time i took it out - after warming up (running about 15 minutes) all the sudden violent misfiring and engine kicking. lost plane and would only run at just above idle. if i tried to gun it it would drop a cylinder and violently shake. i shut motor down and drifted for a few minutes, then started up and ran for 45 minutes straight no problem. still doesn't like to idle more than a minute or so.
last time i took it out. after putting in water and heading to dock, idled waiting for fiance to park the truck, maybe 5-10 minutes. she gets in, push off from dock, get 200 yards away on a plane and BAM! dropping a cylinder, motor violently shaking. i shut it down. waiting 5 minutes drifting. started up and got on a plane. immediately after reaching max rpm it started again misfiring. idled back to dock with my head hung low. i tried to keep it cranked while idling so i could pull a plug in gear trying to check what cylinder is dropping but felt like i was gonna fall out the boat. (14ft carolina skiff).
so what do you guys think? bad coil(s), powerpack maybe? i have read here that electronics tend to show they are bad when the engine warms up. how do i test?
btw, brand new water pump. water felt hot when engine was warm so i changed impeller. water still hot in tell-tale and exhaust of course. could be that our water temp is 86 now down here in Savannah.
let me know what you guys think?
25hp tiller - went from running fine 2 months ago - to having a weird "pulse" losing RPMs at full throttle after running 20 minutes or so, then clearing up. i thought maybe junk in carb. cleaned carb. same problem but not a crippling problem. still ran "okay".
then it wouldn't idle to save my life. does a kicking sputter when at idle that will kill motor if i didn't have it revved. started to worry.
second to last time i took it out - after warming up (running about 15 minutes) all the sudden violent misfiring and engine kicking. lost plane and would only run at just above idle. if i tried to gun it it would drop a cylinder and violently shake. i shut motor down and drifted for a few minutes, then started up and ran for 45 minutes straight no problem. still doesn't like to idle more than a minute or so.
last time i took it out. after putting in water and heading to dock, idled waiting for fiance to park the truck, maybe 5-10 minutes. she gets in, push off from dock, get 200 yards away on a plane and BAM! dropping a cylinder, motor violently shaking. i shut it down. waiting 5 minutes drifting. started up and got on a plane. immediately after reaching max rpm it started again misfiring. idled back to dock with my head hung low. i tried to keep it cranked while idling so i could pull a plug in gear trying to check what cylinder is dropping but felt like i was gonna fall out the boat. (14ft carolina skiff).
so what do you guys think? bad coil(s), powerpack maybe? i have read here that electronics tend to show they are bad when the engine warms up. how do i test?
btw, brand new water pump. water felt hot when engine was warm so i changed impeller. water still hot in tell-tale and exhaust of course. could be that our water temp is 86 now down here in Savannah.
let me know what you guys think?