Problems

[MattMigues]

Yesterday I left launch to see about shooting a deer about halfway to my hunting spot my motor felt like it “let go” I could hear a knocking sound that almost sounded like splines on drive shaft may have stripped. I shut motor down trimmed up spun prop pulled pushed and determined the sound was inside the head. Running on 2 cylinders I went to hunting spot, started back up about 4 hours later motor cranked fine lugged to launch. Returning home first thing I did was pull off cowl and look at plugs… Bingo my #2 plug gap had been closed and you can see where something inside cylinder struck it, I haven’t had a chance to pull head off yet but what do you guys think? Maybe a ring that a piece chipped off? I know I’m looking at some $’s… BTW it’s a 2008 50hp TLR Yamaha.

[swamp snorkler]

Could be, did you shoot a deer?

[CajunChristian]

Could be one of several hundred possibilities. Sucked something into the middle carb and it digested through the middle cylinder, Broke a reed and it closed the plug gap, broke a ring and it closed the gap, the keeper may have fallen out of the piston and the ring turned causing an end to snag a port, the list goes on and on. Only way to tell is to pull the head and start an autopsy. If it closed the gap on the plug, it ain't gonna be cheap. It's just to see how much damage to which parts. Could need a re-sleeve, could be a simple bore job.
D

[MattMigues]

Thanks I'm hoping it's just that 1 cylinder the motor has 300hrs top. CajunChristian I'll be in touch.

[MattMigues]

Originally Posted by swamp snorkler

Could be, did you shoot a deer?

Nope didn't see one! Broke motor and no meat!

[Andy C]

Could be water!! (Head gasket or in the water intake up on the side) Don't wait to tear it down, had a buddy with a 90 that happened too on the bottom cylinder, it's locked up now and has already been boarded, so it's either sleaving ( very expensive) or find a new one/ New used one.

[MattMigues]

Originally Posted by Andy C

Could be water!! (Head gasket or in the water intake up on the side) Don't wait to tear it down, had a buddy with a 90 that happened too on the bottom cylinder, it's locked up now and has already been boarded, so it's either sleaving ( very expensive) or find a new one/ New used one.

in March I'll have owned it for 3 years it had 100hr or less I sure hope I can get it fixed for under 1500, don't really want to justify spending that extra money!

[CajunChristian]

I have motors re-sleeved for right at $250 per hole.
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[MattMigues]

Originally Posted by CajunChristian

I have motors re-sleeved for right at $250 per hole.
D

Sorry I didn't get a chance to call you. We are going to pull it apart tomorrow and see what she looks like I have a couple pics of #2 plug something broke that wasn't supposed to. ImageUploadedByTapatalk1390871576.751719.jpgImageUploadedByTapatalk1390871586.734712.jpg

[speck-chaser]

Time for that 70

[MattMigues]

Originally Posted by speck-chaser

Time for that 70

That'd be sweet but I am not ready to get off that money yet!

[keakar]

Originally Posted by MattMigues

Yesterday I left launch to see about shooting a deer about halfway to my hunting spot my motor felt like it “let go” I could hear a knocking sound that almost sounded like splines on drive shaft may have stripped. I shut motor down trimmed up spun prop pulled pushed and determined the sound was inside the head. Running on 2 cylinders I went to hunting spot, started back up about 4 hours later motor cranked fine lugged to launch. Returning home first thing I did was pull off cowl and look at plugs… Bingo my #2 plug gap had been closed and you can see where something inside cylinder struck it, I haven’t had a chance to pull head off yet but what do you guys think? Maybe a ring that a piece chipped off? I know I’m looking at some $’s… BTW it’s a 2008 50hp TLR Yamaha.

I would bet your piston came off the rod on that cylinder.

pull all 4 plugs then stick a screwdriver in the #2 plug hole and turn the flywheel by hand and feel if the piston goes up and down as it should. if its disconnected it wont go down on its own.

a knocking sound is almost always going to be piston or piston rod related.

looking inside the plug hole you might be able to see if there is something on top of the piston but if that were it most likely would jam the piston and seize the motor.

I don't think its going to be a minor problem, that said it may not be too much of an expensive fix if the cylinder wasn't damaged.

[CajunChristian]

Matt, please don't make the same mistake most rookies make, they repair the problem and never find the cause. If you simply repair the problem, it usually returns to cost you again. Every failure has a cause, find the cause, then fix the problem
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[spoony]

Originally Posted by CajunChristian

Matt, please don't make the same mistake most rookies make, they repair the problem and never find the cause. If you simply repair the problem, it usually returns to cost you again. Every failure has a cause, find the cause, then fix the problem
D

Great advice

[CajunChristian]

Originally Posted by spoony

Great advice

Everything he describes are symptoms. The closed plug gap. I bet when you pull the head, it is pock marked also, another symptom. Something beat around in that cylinder. I sure hope it didn't break a piece of the sleeve of where the ports are.
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[jopete]

is it insured? instead of posting about it on here, u should of sank the boat and let insurance get u a new one. too late now. lol

[CajunChristian]

Originally Posted by jopete

is it insured? instead of posting about it on here, u should of sank the boat and let insurance get u a new one. too late now. lol

Sorry, but that would be insurance fraud
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[MattMigues]

Originally Posted by jopete

is it insured? instead of posting about it on here, u should of sank the boat and let insurance get u a new one. too late now. lol

No insurance lol. It's been frozen here since I'm dragging it over to my buddies but I do agree something caused it to fail just have to find out what.

[1fastmerc]

Originally Posted by spoony

Great advice

X2

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[Bluechip]

Originally Posted by CajunChristian

Sorry, but that would be insurance fraud
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I agree also..... Always good to live by the square.