Yamaha 115 ob blown rod

[bigheaded5]

I have experience helping rebuild 2 auto engines so I'm thinking about tackling a YAMAHA 115 ob with a blown connecting rod. The boat, motor and trailer are FREE. The owner says it blew a rod, I don't know more than that yet.

My questions are.
1- is there any tricks to seeing if the crank is bad before pulling the powerhead OFF the motor? or can this be done without pulling the powerhead OFF at all?
2- is there even a chance a rod can snap and the crank still be good?

Otherwise I'm going to part out the motor and buy another used motor. This has power trim/tilt and is otherwise clean. I see so far new parts are available (rod, piston, gaskets $250+) and if possible would be worth the shot of a first outboard rebuild.

All I know so far is its a Yamaha 115 1991 or so 2 stroke

Eddie

 

[jerryjerry05]

Re: Yamaha 115 ob blown rod

An 81 is really old.
You sure that you wanna spend a bunch of $ on such an old motor?
If so then try to take the carb and reeds off and look into the crank case.
Take pictures as you go cause they have a lot of hoses and lines going all over.
That way it will be easier to put back.
Not a hard job.Just hope the broken rod didn't do and damage to the block?
Word to the wise,don't list your e-mail.

 

[bigheaded5]

Re: Yamaha 115 ob blown rod

The boat is an 91'(posted 1981 in error) and the owner said the motor should be around the same......so I honestly don't know exactly YET. I'm just trying to get a few ideas/words of advice on what to look into later when I pick up the boat and get it into my shop. The reeds will let me see the rod? I know I wont be able to see the crank until I remove the rod from it but I would like to know if I'm wasting my time or not as soon as i can.

I always take a lot of pictures....the old memory aint what it used to be

Took the advice about e mail

 

[99yam40]

Re: Yamaha 115 ob blown rod

usually when a rod goes it slings around and damages other things.
Will have to take apart to see what all is wrong

Good experience for a first timer to tear apart a motor you do not have to worry about things when they break,
only cost is your time to take apart and a service manual will help

 

[bigheaded5]

Re: Yamaha 115 ob blown rod

Good advice.....I am looking for a practice motor as we speak lol

I also plan to invest in the service manual IF I decide to proceed and keep the motor.

 

[robert graham]

Re: Yamaha 115 ob blown rod

Maybe you can find/buy a good/running motor of similar HP, 2stroke, same year....then keep your broken motor for spare parts in the future?....that could be really nice going forward!....

 

[84toyota]

Re: Yamaha 115 ob blown rod

Hey Eddie,
I might be interested in the lower unit and prop if you end up parting it out. I have a 1989 Yamaha 115hp with a jet lower unit, and have been looking around for a prop unit for maximum flexibility. If you end up not fixing it up, let me know!
Thanks,
Ken

 

[bigheaded5]

Re: Yamaha 115 ob blown rod

Hey Eddie,
I might be interested in the lower unit and prop if you end up parting it out. I have a 1989 Yamaha 115hp with a jet lower unit, and have been looking around for a prop unit for maximum flexibility. If you end up not fixing it up, let me know!
Thanks,
Ken

Sure ken but YOU pay shipping, im in NY and as nice as I hear CA is I won't be dropping it of at your door
Ed

 

[84toyota]

Re: Yamaha 115 ob blown rod

Good point Ed - guess shipping might be a killer!
Ken