1982 . . . most likely . . .
Here are some pictures of a 1982 Wellcraft Scarab showing the wood in the transom and the deck coring.
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A 1982 boat, being 42 years old, probably some issues, unless some prior work has been done. You will have to decide upon further investigation into the...
I agree . . . the VST pump probably needs some maintenance (cleaning, etc). A similar thing happened to my 1996 7.4L engines shortly after I sold the boat, as reported to me by the new owner. About 1,100 hours on the engines.
Yes, the learning process can be challenging. Yamaha entered the I/O (sterndrive) market briefly and then got out, so parts and repair are non-existent.
As stated . . . I think you'd be best to find a used Mercruiser 4.3/Alpha combination and do a full replacement.
It appears that the Sierra 18-2628 seal kit may fit your motor, even though it says it is for 1975 and up. iBoats.com should have it.
Old Merc's and a few other places may have the retainer nut tool
https://www.oldmercs.com/category_s/374.htm
See below for what it looks like . . . It is...
No direct experience (sorry), but . . .
Go to YouTube and Search for 'Will Prowse' . . . he is like the boy genius of LiFePO batteries and DC power systems.
I'm about to buy a couple LiTime 100 Ah LiFePO4 batteries. A friend has them and says that they seem good. Will P also holds them in...
It might be better to buy 2 new batteries as suggested. Also, you will want to wire the batteries through a Perko switch, so they are not always connected together.
Have you contacted Regal Boats? They may have some advice or be able to help. Great Lakes Skipper also lists a few windshields, but it may not be obvious if they would fit your boat.
As stated, boat glass is an expensive thing . . . probably because there is virtually no inventory of parts...
7.4L (454) Gen 6 rollers . . . nice engines, probably time for some engine work . . . might just be the top end, but maybe do a cylinder leak test on them before pulling the engines.
If they are closed cooling or run in fresh water I'd re-build the existing engines.
Do you have a serial number for the engine? I'd double-check the balancer part number, based on the serial number of the engine to make sure you have/get the correct part.
Mark IV 454 must be about 30 years old at this point.
Speaking of Plywood . . . About 20 years ago (oh my . . . how time flies) Most boat companies (that use wood) went to a treated plywood to resist rot.
https://inlandplywood.com/products/perma-panels/
In addition to Perma Panel, there is also a similar product called Greenwood XL.
Not sure if...
I'm a Mercury guy . . . but it is all about the condition of the engine. Not sure how you could test it. Maybe a compression test if power can be hooked up to it.
It depends on your budget and how much you are willing to put into it after the fact. In about 1979 (ish), Mercury went from...
IMO and based on experience, a boat rarely goes on the trailer straight enough to intercept the bow stop as shown in the video.
So, the bow eye is likely to miss the catch mechanism and you'll be winching the boat on anyways.
Launching would be fine, but that is the easy part.
Greetings . . .
I'm not sure how much of a manual exists, but where have you tried looking (online)? There are some owner's resources on the Sea Ray website and the Club Sea Ray site. If you Google search a few things come up, but nothing specific.