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The Boat Galley / Re: Old V Sonic to fix or not
« Last post by Haulnazz15 on August 29, 2017, 01:18:46 PM »
Well, assuming the engine/outdrive are good, $2,300 is a fair deal on the structural/fiberglass work I'd guess.  However, if the interior still needs to be redone/reconstructed, and the outdrive/engine/electrical needs work, you're looking at more money than the boat is worth.  You can find plenty of decent boats for $3-4K in the 16'-20' range.  So in the end, what it worth to you to have it running?  I like my MT a lot, mostly for sentimental reasons, but if I had to spend $3K on it to get it back in top shape, I'd probably just sell it and find a boat already in good condition.  That said, I'd have to spend $6-7K to find a 20' boat as well kept as mine, and aside from maybe some cupholders or more modern styling, it's going to run similar speeds and perform just the same.  Hard to justify upgrading when it already does what I need it to.   
The Boat Galley / Old V Sonic to fix or not
« Last post by 69-vsonic on August 28, 2017, 07:24:00 PM »
About five years ago I purchased a V Sonic from the third owner the year was believed to be a 1969 it's 16ft and it was purchased as a project boat.
At the time the previous owner had the interior removed and the boat running it needed a shift cable and Bellows the floor was soft in a few areas so I knew it would need a floor at some point.
That winter after I started pulling the boat apart I ended up breaking my ankle and needed surgery so the boat went in to storage for five years.
Last week I pulled the boat out of storage and begin to overview the boat and begin looking at what I needed to do to get it back water worthy it was last in the water around 1997. I found the floor completely trash part of one Stringer was bad and two bulkheads had completely failed.  I arranged for a professional to examine the boat and the transom to see what to do with it right now the sterndrive is off the boat in the engine is the only thing remaining inside the boat I determined the Fountain of Youth for boats was the place to take it.
Today we made the one-hour trip to the Fountain of Youth for Boats and they overviewed the boat, we found the transom to be ok but we need to pull the engine before we can determine the last bulkhead condition they quoted me $2,300 to redo the stringers, the floor and two bulkheads.

The interesting thing about the boat is it was still produced in New London Missouri and has a serial number of 1725 my question is is this actually a 1969 with a low early production number or is this an earlier boat that was one of the first  two thousand Boats produced by Mark Twain.

Second off do I fix it
General Mark Twain Discussion / Re: Unable to steer right
« Last post by Haulnazz15 on August 28, 2017, 03:20:18 PM »
Another thing to check is if your prop trim tab is adjusted properly.  The tab/fin right above your prop is adjustable left/right to help offset prop torque.  Usually they are positioned pretty much straight forward, but can be moved a bit to help it track straight/hands off when on plane.  It shouldn't prevent turning in any direction, but it can sure make it difficult to turn in one direction or another if the tab is mis-adjusted.  I believe the boats with power steering have a flat anode there instead of the mini-fin.
General Mark Twain Discussion / Re: Unable to steer right
« Last post by Haulnazz15 on August 28, 2017, 03:16:33 PM »
Without seeing it, it's difficult to say.  Does your boat have power steering?  My MT is a decade older and has no power steering, so there is no hydraulic oil.  There is a single cylinder which connects to the steering arm of the outdrive.  Pretty easy to identify visually.  However, there is another small cylinder/reservior with a single plastic pressure hose and wires coming off of it which is attached to the transom bracket above the steering.  This is a trim sensor which works off of calibration with outdrive hydraulics and has nothing to do with steering.  If you have power steering assist, then your setup should have a separate cylinder above the steering linkage with high pressure hydraulic hoses that run to a power steering pump.
General Mark Twain Discussion / Unable to steer right
« Last post by jgalvan on August 24, 2017, 09:29:22 PM »
Hello, I just recently bought a 1986 Mark Twain with a MCM 185 alpha one. Originally it had a carburetor issue when I bought it, I knew enough about them to get it running. As I took it out this past weekend I noticed that the boat would not steer to the right, only left. When I got home I looked it all over and found that where the steering cable goes into what I think is the steering actuator (excuse me if I'm wrong, I don't know much about the marine side or outboards), it has a couple of cylinder type linkages that look like they control the outboard, the top linkage is broken at the threads where it screws into the "steering actuator". I can't seem to find any part break downs on this steering unit. I was hoping someone could point me into the right direction where to start, I'm not positive this is the issue but it is clearly broken and needs replaced. Also what type of hydraulic fluid to fill it with if I remove the lines and drain the fluid. Thanks again.
General Mark Twain Discussion / Re: Trailer for my 78 Mark Twain
« Last post by Haulnazz15 on August 22, 2017, 02:50:34 PM »
Just make sure to inspect/repack the bearings on whatever you buy used.  No telling how it was maintained, and you don't want to be on the side of the interstate with cars whizzing by you at 70mph with a toasted hub.  We give the trailer a fresh shot of grease to each hub every 2-3 trips just as a precautionary measure.  Make sure tires are inflated close to max cold psi, including the spare.
General Mark Twain Discussion / Re: Trailer for my 78 Mark Twain
« Last post by New2Me78 on August 19, 2017, 08:10:24 PM »
I found me a pretty decent one but unfortunately it needs some work. The guy I bought it from had one with new rims, tires, paint but he sold it a couple days before I could get there. This one is a little more HD but as I said needs some work. Something I didn't want to get in. Really want to finally get this old girl in the water. As long as I don't have another 60+ hour work week I should have the trailer & boat done by next weekend. Once I get most everything done I will post some pics.
General Mark Twain Discussion / Re: 1976 162T with 140HP mercruiser cable HELP!!
« Last post by Haulnazz15 on August 17, 2017, 03:44:41 PM »
Well, there's really not a way to lubricate the cable.  Once they corrode, it's just best to replace it.  They aren't particularly expensive ($50-60), but it's just a bit involved to replace them.  The replacement of control cables to the throttle control are a bit easier to deal with for the novice.  I do most of my purchasing from,, or similar.  I don't want to discourage you to do this yourself, but it may be more work than it's worth if you aren't familiar with it.  You'll have to remove the outdrive in order to replace the cable, which means you'll need a outdrive seal kit, and possible a way to remove the bell housing side pins to access the rear of the bell housing.  If the u-joint bellows haven't been replaced in a while, this would be a perfect time to do it as well.  It's probably a $300-400 repair for a marine shop to put in new bellows, shift cable, and drive seal kit.

As far as purchasing the throttle/shift control itself, they can get pretty pricey.  You'd probably have the best luck finding a used unit from a marine salvage place on maybe on eBay/Craigslist.  The newer controls have electronics and such that are built-in, cut-off switches, etc. which aren't applicable on 70's-model MTs.
General Mark Twain Discussion / Re: 1976 162T with 140HP mercruiser cable HELP!!
« Last post by jirwin95 on August 14, 2017, 12:20:46 PM »
Disconnect the cable from the shift plate and see if it operates smoothly from there.  If it does, then you know the "intermediate shift cable" (the one going from the shift plate to the lower unit) is seized up.  If the inverse is true, you'll need a new shift cable to run from the control to the shift plate.  If it's the intermediate cable, you'll have to pull the outdrive to replace.  If it's the control cable, you'll just have to measure the cable to make sure you get the replacement cable in the same size.  You shouldn't be able to start the engine with it in forward or reverse gear, but sometimes the prop will freewheel slowly in neutral.  If it IS in gear, that means that the shift-interrupt switch is malfunctioning/bypassed.

As far as manuals are concerned, there isn't anything available specific to the Mark Twain.  The mechanical parts are almost all pretty much universal for most boats of this period, aside from small accents and such.

I did come to find it is the intermediate shift cable. I got it to move, it is just stiff. Any good way to loosen it up? Can I lubricate the cable? If not, what is a good parts retailer to buy from? I need the whole control lever up front where the driver sits as well. Thanks for all the info. Like I said, im new to boats and how they operate so i don't know the names of everything just yet.
General Mark Twain Discussion / Re: Trailer for my 78 Mark Twain
« Last post by Haulnazz15 on August 11, 2017, 02:59:34 PM »
Also, just make sure that you have the proper amount of tongue weight, regardless of which trailer type you get.  Usually 7-10% of total weight is a good number for tandem axles to prevent sway.  Single axles are usually 10-15% recommended tongue weight.  That can be significant with larger loads, but when only talking a 3,500lb boat, it's only 100lbs different.
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