I have no experience with them... I will ask if anyone has had any...
I am sure hammer, p29, whiz, ect.... may have some info on them.
Just for s&g, did you check out there manf web site?
There should be some info there.
like warranty..... how long it is
typical problems (tied i with warranty work ect..)
may be links to help you research them, like a lemon law searc or something.....
Just trying to help...
Every marine shop services Mercruiser. My last boat had an OMC King Cobra drive and there were 3 shops in the area (from downriver to harrison twp) who would touch it, and they were also Merc. shops. I have no idea who services Yamaha drives around here, but I have a feeling it would be like trying to find a Fiat dealer in the area.
You might try calling around to a few marine shops, they might be able to give you some info on them. Try posting on Boatered.com on the Engines forum. George Van Parys is the moderator and knows everything about boat engines there is to know. I'm sure he'd be able to give you some info on them.
I did a search on Boattraderonline and there are only a handful of Yamaha I/O boats (out of 95,000). Looks like they were offered maybe 91 - 96, many of them Chaparrels and Renkens. Apparently they were not offered by the higher volume mfrs. I guess that doesn't mean it's a bad drive, but I'd be worried if they haven't been making them for 7 or more years, and they weren't that popular when they were being made.
I bought a used boat last summer with a yamaha outdrive and engine. It is a 1993. I did not do my home work and am now finding out how hard it is to come by parts and find some one to work on it. Now that said I was told by one mechanic that it is well built. We only used it three times and it ran very well. Still waiting to get it out this spring. You can go iboats.com on the i/o's forum and post or search the forum there. The one I bought only had 64hrs on the motor and it to is in excellent shape. I hope everyday that I don't have problems with it. Goodluck with your decision.