Yamaha 25 HP 4 stroke

drakebake

Recruit
Joined
Sep 10, 2001
Messages
3
My motor is new (2001). I have approximately 8 hours break-in on the motor. It has electric start and would fire instantly on hitting the ignition switch. I’m using this boat for duck hunting in shallow marshy areas. My first rip into the marsh I was running a little past idle speed when I started losing power and motor smoking. I checked the water stream and it had stopped. I shut down the motor, got into the water and cleaned the intake around propeller. Started it back up and it ran fine. When I got home I put in a local lake to check operation at full speed. The starter clicked and would not engage. After a couple of minutes it fired but took a lot of turning over to get started. The motor has acted this way since it got hot. It only acts this way when the motor is cold. My question is what are the ill effects of my motor getting hot?<br /><br />Sorry for the length of post, but I’m wondering what kind problems I might be looking at before I go see the mechanic.<br /><br />Thank you<br />Rick B
 

Fouled Plug

Ensign
Joined
Jun 29, 2001
Messages
935
Re: Yamaha 25 HP 4 stroke

I would suggest a compression test to make sure the headgasket didn't fail from the overheat. It may have, giving you low compression on one (or both) cylinders, making it hard to fire. Let us know what readings you get. If you don't own a tester, or can't borrow one, a cheap one can be had for around $20. It's invaluable in checking the health of motor. You may want to replace the impeller as well, since it is probably damaged. No warning buzzer on this Yammy?
 

drakebake

Recruit
Joined
Sep 10, 2001
Messages
3
Re: Yamaha 25 HP 4 stroke

No buzzer, not available on my tiller control model. Are these serious problems? I’m not much of a mechanic.
 

drakebake

Recruit
Joined
Sep 10, 2001
Messages
3
Re: Yamaha 25 HP 4 stroke

No buzzer, not available on my tiller control model. Are these serious problems? I’m not much of a mechanic.
 

Rodbender

Recruit
Joined
Aug 24, 2003
Messages
2
Re: Yamaha 25 HP 4 stroke

Hello all- I just purchased a new 25 four stroke, and the dealer didn't have the owners manual ( will ship later this week). I would like to get the motor broken in this long weekend and remember that the mechanic was telling me 6 to 10 hours with a couple people in the boat for weight, idle for a bit, 1/4 open, 1/2 open etc... Was wondering if anyone with this motor has any more specifics. I have read all the other reports but would like a bit of clarification before starting her up. Thanks. :confused:
 
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