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86 yamaha 150
Hello all,
I am looking for a little info on a 1986 Yamaha 150 motor. I found a boat for sale and I am interested in the motor for my 1974 V20. The motor cosmetically looks poor but it seems to run well on muffs. The compression is between 110 and 115 on all cylinders. The big problem is the shift shaft is corroded and very weak so I cant water test it. I guess this is a fairly common problem for these motors and I feel I can fix it. The motor is a salt water motor and is has corrosion on the block and hardware. The motor is on a 1987 proline 23ft walk around which is in good shape except for the seats and wood trim. I had thought about keeping the boat for strictly a fishing boat and using my 82 V20 as a family cruiser and looking for another motor for my 74. I don't know...Anyway the guy is asking $2000.00 for everything is it worth it or should I keep looking? Thanks... 
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#2
08-07-2010, 11:06 AM
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Good looking V20.. Looks like you take care of her
 I have no experience with those motors, but I think I recall hearing MJ saying something about them switching to a stainless Steel shift shaft after a certain year because of the corrosion problem. That being the case I'm thinking that maybe it's retro and you can just switch the one that's there for the SS one. I do know that Yammies are great engines.. parts are expensive but they are well built.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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#3
08-07-2010, 01:06 PM
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They are great motors, But in 94 (The Salt water Series) they changed the shift rods to Stainless as they all rot and you no longer can shift them.
They can sometimes be a ***** to replace as the power head has to be removed to do it. And the rotted bolts will break. If you are lucky to get them out the job is preety easy to do. BS got all his out and mine also was with out issue. If you do your self its pretty cheap, but can be costly at a marina!! I have heard storys of almost a grand!! Good Luck! Good Luck!
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1986 V20 Old Fishermen never die, we just SMELL that way!!
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#4
08-07-2010, 03:46 PM
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Thanks for the input!! I know Yamaha has a reputation for building good motors and that is why I am considering taking on the challenge. I repair CNC machines for a living so I have good mechanical skills and more tools than most, but I haven't worked on outboards much and would hate to end up taking it to a marina to have it fixed. I'm trying to be as money conserving as possible but when I bought my first boat years ago people told me to B end O ver A nd T ake it.... Now I am hoping to get a second boat up and ready for the water so I get a double shot of BOAT. The guy won't be back until Monday so I will wait and see if we can't come up with a better deal on the boat and motor. My 82 V20 (the one in the picture) has been a great boat and I look forward to many more years with it. It was rough in the beginning as it has the 470 in it and the usual problems, charging system, cam seals, oil pan, but I fixed all that and have no real problems with it now. I do have a low speed problem (trolling) but I will post in the repair section on that. Thanks again..
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#5
08-07-2010, 04:32 PM
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First off I have 3 Yammies all the same era and I can't complain about them. If it has good compression then I wouldn't hesitate to buy it except...
Yamaha used plain steel parts on some critical parts back then. You already know the shift shaft is a problem. Look at the steering (tiller) arm too. If you want to do it right then you need to remove the powerhead and you will likely need to destroy the exaust adapter to do so. If you are not familiar with BFH and red wrench then pass on it. Around $500 - $1000 in parts depending on how much you break and how resourceful you are at tracking down parts. If you PM me I will tell you my top secret Cheepskate Yankee Miracle Patch for the shaft. It ain't pretty but it will last a few seasons.
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#6
08-07-2010, 08:49 PM
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Just got thru doing one of those for a customer, If I had charged him the amount of time I had in it, he could have bought another motor. Personally, $2000 is too high for a salt ball Yamaha, take a good look at teh trim motor, that will be the next big money issue. I know a lot of people like Yamahas, they are good running engines, but parts are high and they do corrode alot. I'd keep looking and try to find a fresh water motor, it will be worth the extra money
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#7
08-07-2010, 08:53 PM
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I forgot about that, My trim motor went also, then I could not get the side mount off and destroyed the steering tube getting it apart.
 But that was a great motor!!
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1986 V20 Old Fishermen never die, we just SMELL that way!!
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#8
08-08-2010, 09:42 AM
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Well I agree even if it is a great motor I can see corrosion in other places and I don't want a money pit. I am still going to talk to him again Monday and haggle, see if he might be interested in a trade of some sort ( I have a lot of good junk laying around). Thanks all....
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#9
08-08-2010, 09:08 PM
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Quote:
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Linear Mode
