is there much of a weight savings from this merc we are speaking of to the 1992 200hp yamaha that i was thinking of looking at?

what kind of $$ are we talking to upgrade the charging system on this motor?

what should the compression numbers be ideally on this motor (merc) ?

as always, thanks for the info .. it is priceless.

Think hard before doing a motor bigger than a 150 if you are doing a bracket. Don't rely on the flotation that comes with the bracket to make it work, it won't. It will mostly help offset the weight being extended 25-32 inches further back and will barely do that.

The MAJOR point to keep in mind here with a bracket conversion is running on plane. A flotation bracket will offset the balance when idling or off plane, but once your on plane that 350-400 pounds is hanging out there with nothing offsetting the balance. Trim tabs on a CC with a bracket should be mandatory I believe from what I have read on them. Unfortunately some of the lightest engine options are also some of the thirstiest. There are lighter outboards than the MERC 2.0L, but they guzzle fuel. The 92 200HP YAMAHA you are looking at should actually be the 2.6L(I think) YAMAHA which is the same basic engine from a 150-200. That was back in the day when YAMAHA got sued by OMC for patent infringement when they directly copied OMC's engines and sold them as YAMAHA's. The first YAMAHA V4 could almost interchange internal parts with an OMC V4, and many racers run the YAMAHA electronics on there OMC's as they are almost a match for each other.

The 92 200HP YAMAHA is 390 pounds according to ther NADA guide, so it would only be a couple pounds heavier than the MERC. It actually weighs the same as my 85 140 JOHNNY-RUDE I have, so it shouldn't be a major issue with weight on it.

I reccomend you read this thread as WHATKNOT just did a similiar conversion with a 150 YAMAHA(same weight as the 200 your eyeing).

http://www.wellcraftv20.com/communit...ead.php?t=9006

thanks for the info .. went to the marina and looked at the merc .. looks ok, was told that none of these engines have an air filter?? just an airbox which they say this one has. they ran it and it has a miss, also can hear it run on the ebay ad. stated they do not know what the miss is from .. could be as simple as a tune up or carb cleaning .. but to diagnose it, would be shop charge at $98 per hour. they have the motor for sale listed at $1800 but told me to make an offer of $1500 and that would probably take it. ebay auction is still at $710 with 3 days to go. maybe i will roll the dice and see what the auction brings.

As for the yamaha, the major flaw from what i can find out is the shift rod .. was told you can see if it is broken from the outside of the motor, but to fix it you have to take the power head off. upwards of a $1000 bill. how can i make sure this used yamaha i am eyeing up does not have shift rod problems?

keeping fingers crossed one of these motors will work out ,, if not.. the search continues.

Brad

yeah none of the outboards have aircleaners(except Opti's), offer them $1000 cash, pending a compresion test, spark test, and check the gear lube. If they don't have anythign to hide, they should take it

They list the compression numbers in there ad, and they didn't look good to me. low side 110 and high side 135. They don't have air filters, but the air box is an important item to leave on them if they are jetted stock. They resatrict the airflow just slightly t o control the metering circuits in the carbs, and if you remove it on a stock engine it will cause it to lean out and burn a piston and cause a miss or lock-up. I wouldn't offer him a $1000 for an engine with compression numbers like he posted it has, let alone if it has a miss.

On the YAMAHA all of em prior to 94 had a steel shift shaft and they are known to rot in two and then you can't shift them. The repair can range from around $250 for the shift rod and base gasket on up depending upon what else you have to do at the time of the repair. If the bolts that hold the powerhead on are seized in then the repair can get expensive and labor intensive.

If the 92 200 Yamaha was used in fresh water only, the shift rod has probably not corroded and it's not ready to break . It doesn't take alot of saltwater use to cause corrosion fast however. The 150, 175, and 200 Yamaha's are close to the same weight.

As far as reliability of early Yamaha V6's is concerned, they are about as simple and reliable as they get. The oil system is very simple and reliable. With the exception of the shift rod replacement, or power head removal (broken bolts) they are easy to work on. Rebuilding the water pump is very easy and I have been doing this repair for years. (about a 1.5 hr job)

I have had and still have Evinrude outboards and like them very much. However, I never owned an Evinrude or Johnson bigger than a three cylinder 70HP.

All in all, the Yamaha's I have owned have been the most reliable outboards by far. They are not the most fuel efficient, or fast, and they require regular preventive maintenance. But when I head out of the inlet to the open ocean, I am glad I have the Yamaha hung on my V's transom.

Geek

Brad, I know a guy who has a '91 jonny on his V20 Fisherman and says it does about 60mph. That's a little fast to me but a midrange RPM V-6 that old will get the same mileage as a 4cly. of the same year at top end. I just sold a boat that was slighly underpowered and I regretted that decision. If you don't mind a little more gas consumption get a low HP V-6, they just perform better. It is true that Yamahas are a bit more reliable, but Mercs have much more power and they use a great V-6 system of Optis. You sound like a faster kind of guy, and there is no problem considering EFIs. Like the Merc 2.5L's.

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