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Author Topic:   1992 Yamaha 90
bruce hartwell posted 04-10-2004 07:26 AM ET (US)   Profile for bruce hartwell   Send Email to bruce hartwell  
I just purchased and had installed a 1992 Yamaha 90-HP on my 1970 Whaler SPORT 16. Does anybody run this combo?

What is the max RPM on this engine?

What props are being used?

[Is a]service or maintenance manual [available]?.
Bruce Hartwell

Clark Roberts posted 04-10-2004 08:31 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
I've run lots of 90 Yamaha's on the 1975 and later model 16'7" hulls but none on the pre-smirk models. Expect above 40 mph (most of mine hit around 41-42mph with 15" pitch prop and 5500 rpm) so since your hull is lighter it may swing a 17 or a 19 (wow) and hit mid 40's. Above is best I can remember as it has been a long time ago. Happy Whalin'... Clark ... Spruce Creek Navy
Bigshot posted 04-12-2004 11:56 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
13x17 and you will hit 5500 which is redline.
jimh posted 04-12-2004 09:39 PM ET (US)     Profile for jimh  Send Email to jimh     
When I tried to purchase a factory service manual for my Yamaha engine the authorized sales and repair dealer told me that such information was not for sale to the customer and was only available to the dealer. This was a couple of years ago. I guess Yamaha of America finally figured out that a load of crap like that would not fly in the United States of American, and I think that now you can actually purchase a factory repair manual. At least they say you can, but your actual success in doing so may vary.

If you get your hands on a real Yamaha factory service manual, please let us know with a follow-up posting. As far as I know they still don't sell them to customers in the real world.

You can get some of their manuals via an on-line website. I'd go to YAMAHA.COM and see how easy it is to find them.

There are some after market manuals available. I have one but I really don't endorse it. It was acceptable when the real factory manual was NOT FOR SALE TO CUSTOMERS.

I tried to order some parts, but the Yamaha dealer was such a pathetic screw-up that he ordered the wrong parts for me. Some of the difficulty was due to the bad translation of the manual from Niponese to English.

They'd call the the stator winding that supplied the charging current the "lighting coil" and the stator winding that supplied the excitation voltage to the high tension spark coil the "charging" coil. So when I told them I had a problem with my battery charging and gave them the part number of the "lighting " coil, the morons ordered the "charging coil." It took about three weeks to get parts from the factory. The dealer did not have anything in stock. It was pathetic. He did not even have a common water pump impeller for a very standard engine in stock. When I would ask him about this he would try to give me some silly crap about "We never have to repair any Yamaha engines so we don't keep any parts." Yeah, right, buddy, I might have been born at night but I wasn't born last night.

Eventually I found out that my whole engine was just a copy of an OMC power head and a Mercury lower unit, so now when I need some work on it I just take it to either the Mercury dealer or the OMC dealer.

They are nice engines, but when you need parts they are expensive, hard to get, the service dealer acts like you are the first guy on the planet that ever needed a part, and don't be in a rush.

It got so bad around here that my Mercury dealer finally gave in and became a Yamaha dealer so he could get parts and do service on them. He is now doing quite a good trade in repairing Yamaha engines.

By the way, to become an authorized Yamaha repair shop you only have to buy an initial stock of $2,500 in parts inventory. At Yamaha prices this is about five parts, by the way. So even though there are about ten so-called factory authorized parts and service dealers in my area, none of them have any parts and really can't do any service.

In case you think I am in Fargo, North Dakota--not the end of the world, but you can see the end of the world from there--I am in SE Michigan, which has more registered boats than any other state. And in SE Michigan we probably have about half of all the boats in the state.

Yeah, yeah, I know there are more boats in other southern states like Florida, but that is only because I said "registered boats". We don't have a population up here where 70-percent of the people are scofflaws.

OK, enough of a rant, that is my story and I am sticking to it.

bruce hartwell posted 04-13-2004 08:51 AM ET (US)     Profile for bruce hartwell  Send Email to bruce hartwell     
Current prop is a 16 K. Any inf on this???
jimh posted 04-14-2004 01:12 AM ET (US)     Profile for jimh  Send Email to jimh     
get ib w/motor?
Peter posted 04-14-2004 07:58 AM ET (US)     Profile for Peter  Send Email to Peter     
Bruce, go to the and click on the "Parts & Service" link. You will see a listing for "Buy Owners/Serv Manuals". You should be able to find and buy what you are looking for there. The 16 K marking on your propeller likely means a 16 inch pitch propeller. I suspect its a stainless prop with the even number for pitch. "K" is the hub series. The Yamaha 70 through 130 uses "K" series propellers. V6s use the "M" series.

Jim,Yamaha has an on-line parts catalog with exploded view diagrams of all motor models made since 1984. You can go on-line, find the part numbers you need from a list, click on them and automatically make a pick list that can be taken to your local parts dealer. It's not very hard.

You, of course, are permitted to rant all you want regarding Yamaha, but in terms of on-line product support (including making available a wide variety of on-line performance reports), you have to admit that Yamaha is way ahead of any of the other manufacturers, including the blessed Mercury.

Back in the 70s and 80s when I owned OMC motors and today with either Yamaha or Bombardier, no dealer ever carries much of an inventory of parts, so nothing has changed. I bet if I went to a Mercury dealer with a rather obscure part need, they wouldn't have it either

jimh posted 04-14-2004 08:47 AM ET (US)     Profile for jimh  Send Email to jimh     
I do agree that Yamaha has come quite a way from those days just a couple of years ago when they would refuse to sell you a service manual.

And I agree that you can't expect a dealer to have every part in stock, but they should be able to get them in a reasonable time. Again, perhaps Yamaha have made progress in their parts distribution to service dealers.

A water pump impeller that is used across a series of motors from 40-90 HP—that is the kind of part you would expect to find in stock at any outboard motor dealer that said he was in the "parts and service" business.

The good side of all this is that once you get a Yamaha in good shape and running well, it tends to stay that way with just a bit of care and feeding.

Peter posted 04-14-2004 09:37 AM ET (US)     Profile for Peter  Send Email to Peter     
Correction, the 60 through 130 use K series propellers.

The reality is with "just in time" distribution, nobody keeps significant inventory anymore. If you need something other than a normal maintenance part, the factory probably has to make one for you.

bruce hartwell posted 07-13-2004 10:29 PM ET (US)     Profile for bruce hartwell  Send Email to bruce hartwell     
Dear Forum, I appreciate all your input and help I have seen thus far. I have taken my boat out 4 times this season so far, and have been thrilled with my new engine and the boat's performance.I have been able to push the boat and engine a little more on each outing. Last time I was able to make some full throttle passes with minimal amount of gear aboard, 1 occupant. Rpm maxed out at 5100. I am thrilled with the pickup, and happy with the top end. Should I be content with the prop on the engine, or would a change net me better low and top end?
Mumbo Jumbo posted 07-14-2004 02:43 AM ET (US)     Profile for Mumbo Jumbo  Send Email to Mumbo Jumbo     

I have a 1964 Eastport with a 2002 90 hp Yamaha two stroke. it has a 13x 17" stainless Yamaha prop. I ran a test with two 175 pound adults, 75% full 27 gallon Pate tank, two anchors, usual gear and coolers, and poling platform aboard. Two way GPS test on smooth water (with and against current) yielded these results: 5200 rpms and two run average of 39.5 mph. Some light algae fouling on the hull. Based on this, I would probably keep your prop unless it could be traded for the 17" which I think is the perfect prop for your rig under most circumstances.

Bigshot posted 07-14-2004 02:44 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
How far trimmed up did you have it? This makes a HUGE difference in RPM & speed.
Hobie1981 posted 07-15-2004 12:51 PM ET (US)     Profile for Hobie1981  Send Email to Hobie1981     
Hi All:

My go-to person when I need Yamaha parts or advise on my 70 HP 2S, is Sue Lodel at Twin Cities Marine (920) 793-2715.

Twin Cities is also a Whaler dealer.

Sue has a vast knowledge of the Yamaha product, and knows how to get parts quickly from the vast Yamaha distribution network, should she not have what you need in her inventory.


bruce hartwell posted 07-24-2004 06:47 AM ET (US)     Profile for bruce hartwell  Send Email to bruce hartwell     
bruce hartwell posted 07-24-2004 06:49 AM ET (US)     Profile for bruce hartwell  Send Email to bruce hartwell     
Could anyone tell me the proper trim angle adjusting hole they use for the 90 Yamaha on an older 16'7" whaler. I am running 5100 rpm, wot , minimum load, also using the yamaha 16 k prop
DanT posted 07-24-2004 11:02 AM ET (US)     Profile for DanT  Send Email to DanT     
Bruce, I have a 1987 90 hp Yamaha on a 1966 Eastport. I have the tilt pin in the second hole from the transom side. Using a 17 inch pitch Yamaha black steel prop the boat is quick to plane when trimmed all the way in and once running if I trim it out it will run 42 mph on GPS at 5500 rpm. This was measured with about 20 gallons of gas with myself and a couple of kids.

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