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Started By
Message
yamaha 300
Posted on 6/7/18 at 12:19 pm
Posted on 6/7/18 at 12:19 pm
Thoughts .. yam 300 outboard will run normally off the trailer until idle off the step. Will idle normally for a few minutes but will not give more than 1600 rpm after... stop engine for a few minutes.. will run normally until idle again then repeat 1600 rpm. Ran back to the dock for about 30 min with engine slowly losing rpm ... down to 1000.
Both fuel pumps checked out. All filters were changed and fuel is clean. Still same result.
Both fuel pumps checked out. All filters were changed and fuel is clean. Still same result.
7
Posted on 6/7/18 at 12:29 pm to OverboredTgr
sounds kinda like the power pack.
Posted on 6/7/18 at 5:33 pm to OverboredTgr
my yammy 150 did exactly same thing but I had some water in my fuel from using ethanol gas (this was many many years ago btw)...had to purge my tank and filter a couple times.
Posted on 6/7/18 at 7:46 pm to OverboredTgr
Bad gas
Posted on 6/7/18 at 9:59 pm to OverboredTgr
Change your water pump yet?
Posted on 6/7/18 at 10:06 pm to OverboredTgr
Mine did something similar took three mechanics to figure out it was the Thermostat has a crack in it “running cool” when it runs hot an alarm will go off but not if it runs cool.
Posted on 6/8/18 at 8:15 am to bbvdd
Agree with Bama poster. I had this issue with my Yamaha; it was the power pack.
Posted on 6/8/18 at 9:38 am to CHEDBALLZ
not yet.. 400 hours on engine
Posted on 6/8/18 at 11:39 am to OverboredTgr
quote:
not yet.. 400 hours on engine
First thing I'd do is replace that impeller / waterpump.
Go from there.
Posted on 6/8/18 at 2:03 pm to OverboredTgr
Upgrade to 425
Posted on 6/8/18 at 9:39 pm to WPsportsman
Same thing. 2006 two stroke. Did it for three years or so and o changed the impeller at least 3 times. Finally brought it to a true experienced person and he change thermostat.
Posted on 6/12/18 at 7:55 pm to OverboredTgr
Update?
Posted on 6/13/18 at 5:02 pm to CHEDBALLZ
mechanic had me pull the check valve from inside the fuel pump (since I didn't feel like waiting for him) .. the check was bad so I changed it ... didn't solve the problem but now I can hear the fuel pump sucking air through one of the lines that has a very small crack that evidently opens only when in gear. I can hear it but haven't isolated it yet. Work in progress.
Posted on 6/13/18 at 6:45 pm to OverboredTgr
Just replace the entire line if you can. Shouldn’t be a terrible job.
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