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2017 Yamaha 300 problem

Old 09-24-2017, 05:59 AM
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Default 2017 Yamaha 300 problem

I have a 2017 contender with a 2017 yamaha 300 with about 75 hours or so on it. The motor has been strong and issue free up until yesterday.
We ran out and anchored up and fished for awhile and decided to pull up and try somewhere else. Motor starts up no problem, when getting under way it seems a bit "rough" and a little more noise coming from it. Not a lot but it just didn't seem 100%, it seemed to straighten itself out quickly and I get up on plane and suddenly the motor kicks up like i hit something submerged and shuts off. I trim the motor up and no damage and no evidence of hitting anything at all. Put the motor down and go to start her up and nothing, just a click. Tried starting several times same click and nothing. Trim motor up and make sure its in neutral and the prop spins easily. Put the motor back down and try again and same click. By this time I'm happy I got the towing insurance!
A few minutes elapse while I let my sphincter relax and try starting it again and it now starts up. It still sounds strange (no other way I can describe it) but it seems to straighten itself out and it seems to run fine. Decided to not chance it and headed in and took it up to WOT to test it and it seemed to run fine.
Im at a loss, motor only has 70 some hours on it and I didn't hit anything so I'm kinda looking for help as to where I should start to look on this damn thing as now I don't trust it until I figure it out.
Any advice will be welcomed.
Old 09-24-2017, 06:07 AM
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Get Yamaha to scan the engine. That's what I would do. I wouldn't just wait to see if it happens again. Alloy Boy may have some advice for you.
Old 09-24-2017, 07:23 AM
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Sure sounds like something hit or got wrapped to force that lower up. How else would it kick up? Maybe a old line from a reef anchor? Have you removed prop to inspect prop shaft?
Old 09-24-2017, 07:45 AM
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I have not pulled the prop yet, was kinda waiting to see what people thought. I agree with your questioning throwing the lower up but there is absolutely no damage to the skeg or prop and nothing visually wrapped around the prop.
Old 09-24-2017, 07:55 AM
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Originally Posted by jcirks View Post
I have not pulled the prop yet, was kinda waiting to see what people thought. I agree with your questioning throwing the lower up but there is absolutely no damage to the skeg or prop and nothing visually wrapped around the prop.
The initial rough start could have been from fuel sitting or sucking something in and is unrelated to the motor kicking up. I've had my engine kick up from hitting junk. Scary when it happens but motor started up and has ran great ever since. I believe that I read on one post that there is a sensor that prevents the motor from starting when this happens but could be wrong.
Old 09-24-2017, 07:58 AM
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Old 09-24-2017, 08:00 AM
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Check prop, replace water separator, use Yamaha Ring Free - try again.
Old 09-24-2017, 04:12 PM
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Whatever you do don't mention to the dealer anything about it kicking up. That opens up yourself to having to cover the problem. Just take it in and tell them it was running rough, cut off, wouldn't crank back until it sat a bit. The less they know the better off you will be.
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Old 09-24-2017, 06:20 PM
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Originally Posted by jcirks View Post
I have a 2017 contender with a 2017 yamaha 300 with about 75 hours or so on it. The motor has been strong and issue free up until yesterday.
We ran out and anchored up and fished for awhile and decided to pull up and try somewhere else. Motor starts up no problem, when getting under way it seems a bit "rough" and a little more noise coming from it. Not a lot but it just didn't seem 100%, it seemed to straighten itself out quickly and I get up on plane and suddenly the motor kicks up like i hit something submerged and shuts off. I trim the motor up and no damage and no evidence of hitting anything at all. Put the motor down and go to start her up and nothing, just a click. Tried starting several times same click and nothing. Trim motor up and make sure its in neutral and the prop spins easily. Put the motor back down and try again and same click. By this time I'm happy I got the towing insurance!
A few minutes elapse while I let my sphincter relax and try starting it again and it now starts up. It still sounds strange (no other way I can describe it) but it seems to straighten itself out and it seems to run fine. Decided to not chance it and headed in and took it up to WOT to test it and it seemed to run fine.
Im at a loss, motor only has 70 some hours on it and I didn't hit anything so I'm kinda looking for help as to where I should start to look on this damn thing as now I don't trust it until I figure it out.
Any advice will be welcomed.
Possibly bad rigging. Check ALL wiring connections to the motor including the starter.
Old 09-24-2017, 07:20 PM
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is it possible the kick was from the outboard suddenly shutting off? I had a 200hp vmax that shut off so suddenly that it felt like I hit something. I would start up jump on plane and it would happen again. looked under the hood and found a short fixed it and never had that problem again

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