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MattMigues 01-27-2014 01:46 PM

Problems
 
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 01-27-2014 01:50 PM

Could be, did you shoot a deer?

CajunChristian 01-27-2014 01:56 PM

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 01-27-2014 02:09 PM

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

MattMigues 01-27-2014 02:10 PM

Quote:

Originally Posted by swamp snorkler (Post 661711)
Could be, did you shoot a deer?


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

Andy C 01-27-2014 03:19 PM

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 01-27-2014 03:37 PM

Quote:

Originally Posted by Andy C (Post 661725)
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 01-27-2014 03:46 PM

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

MattMigues 01-27-2014 08:14 PM

2 Attachment(s)
Quote:

Originally Posted by CajunChristian (Post 661729)
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. Attachment 62687Attachment 62688

speck-chaser 01-27-2014 09:03 PM

Time for that 70

MattMigues 01-27-2014 11:05 PM

Quote:

Originally Posted by speck-chaser (Post 661774)
Time for that 70


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

keakar 01-28-2014 03:22 PM

Quote:

Originally Posted by MattMigues (Post 661708)
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 01-29-2014 09:02 AM

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

spoony 01-29-2014 09:32 AM

Quote:

Originally Posted by CajunChristian (Post 662184)
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 01-29-2014 10:14 AM

Quote:

Originally Posted by spoony (Post 662187)
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.
D

jopete 01-29-2014 10:49 AM

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 01-29-2014 12:03 PM

Quote:

Originally Posted by jopete (Post 662202)
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:(
D

MattMigues 01-29-2014 01:31 PM

Quote:

Originally Posted by jopete (Post 662202)
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 01-29-2014 02:06 PM

Quote:

Originally Posted by spoony (Post 662187)
Great advice

X2

Sent from my SAMSUNG-SGH-I317 using Tapatalk

Bluechip 01-29-2014 02:11 PM

Quote:

Originally Posted by CajunChristian (Post 662230)
Sorry, but that would be insurance fraud:(
D

I agree also..... Always good to live by the square.


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