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Author Topic:   Suzuki DF70 4 Stroke on Classic 15'

Kingsteven18 posted 09-27-2007 10:05 AM ET (US)
I've gotten feedback from one person with the exact same setup but I'm looking for all I can get. I know it's heavy, but I can get a 15' in VG condition with a like new DF70 on it for $5K or less, so I'm trying to decide. Thanks.
Tohsgib posted 09-27-2007 10:51 AM ET (US)
Only know like 2 people who have done it and both were happy but said she was a tad stern heavy at rest. Take it for a test run. Hell the engine alone you can sell for over $3k if not thrilled which I think you will be after you move some weight forward.
Kingsteven18 posted 09-28-2007 09:27 AM ET (US)
Well, under the front hatch he showed me what he said was 150 lbs. of poured concrete. I might offer less and take my chances.
Tohsgib posted 09-28-2007 10:22 AM ET (US)
I think a couple buckets of leadshot would have been better. Can you get the concrete out?
Kingsteven18 posted 09-29-2007 07:14 AM ET (US)
Where there's a will, there's a way. I'd drill holes in in it with a hammer drill which would then leave room for it to crack when struck. I can't imagine the concrete adhering to the fiberglass that well.
JMARTIN posted 09-30-2007 10:46 PM ET (US)
http://i34.photobucket.com/albums/d137/jmartin-/2006trip069.jpg
There is a bag of rocks in the bow. It's just fine once up on plane. John
standfas posted 10-01-2007 02:27 PM ET (US)
What is the recommended stern weight for a 15' SS?
Plotman posted 10-01-2007 04:59 PM ET (US)
Here is how I would get it out - drill two holes angled in towards each other - like this \ /, put in a couple of red head anchor bolts, run a metal strap between them, and use that as an eye to pull out the concrete. I'm guessing it will pull out of the anchor well fairly easily.
With twin 130s on my Outrage 22, my boat has a stern-heavy static trim. I have 100 lbs of lead shot in each of the two forward rope lockers. Each is held in a piece of 3" PVC pipe with the end caps soldered on.
Good lord, pouring concrete into a whaler!
george nagy posted 10-02-2007 09:29 AM ET (US)
Maybe you could just locate the tank(s) under the forward bench seat instead of all that extra permanent weight.
Binkie posted 10-02-2007 01:32 PM ET (US)
plotman,
I would like to wager you that your idea won`t work, and the lift will only pick up the bow of the boat unless plastic sheeting was laid down inside the cavity before it was filled with concrete. The only way is to break it up, and there is a good Chance that the glass skin will crack as you are doing it, or is already cracked from the heavy weight of the concrete when the bow slams into waves. You might have a chance if mortar mix was used, but if the fool used concrete with aggregate in it, no way. I would offer less to cover the repair work.
Did you ever try to get concrete out of a plastic 5 gallon bucket? Anyone who ever worked in construction, knows it is impossable. You can turn it upside down and slam it to the ground and it won`t budge. If you try to break it out, you will break the bucket. Yes the plastic bucket has some draft (wider at the top than the bottom) Concrete will also stick to metal, an anyone who has ever had to break concrete out of a concrete mixer will attest to.
rich
Kingsteven18 posted 10-04-2007 05:00 AM ET (US)
I will drill 1/4" holes in it and insert and set off firecrackers. I've heard of people doing that to split stone.
Kevchap posted 10-04-2007 09:06 AM ET (US)
I sold a 15' to a friend this summer who installed his 70 Suzuki 4-stroke on the back. Runs about 38 mph at WOT and gets on plane nicely with up to 4 adults. Floats about 1.5 inches lower than it did with the 70 Evinrude but doesn't pose a problem. Suzuki weighs 100 lbs more than Evinrude. Very quiet, smooth and easy on gas.
Perry posted 10-04-2007 01:14 PM ET (US)
38 MPH? I have heard reports here of the same DF70 pushing a Montauk to 39 MPH.
Nick, what say you?
Tohsgib posted 10-04-2007 02:04 PM ET (US)
I said 39.4 was my best. 38 is possible if set up incorrectly. This is also 2nd hand info so I did not care to comment.
Kingsteven18 posted 10-04-2007 02:15 PM ET (US)
Yippee!! I went back to take a closer look. At least he had the brains to line the compartment with blue shrink wrap first. Should make removal (I'd try the lead shot instead) a lot easier. Keep up those performance replies though; I'm just waiting on a price. Thanks. Steve
Perry posted 10-04-2007 02:55 PM ET (US)
My point was that 38 MPH seemed a bit slow on a classic 15 powered with a Suzuki 70 HP 4 stroke when a DF70 on a larger 17 foot Montauk has been reported to reach 39+ MPH.
Tohsgib posted 10-04-2007 03:12 PM ET (US)
I know...I said i got 39.4 on a 17. I have heard people only getting 35+ with a 70 2 stroke so anything is possible. That boat should get 42-46mph if set up right.
Kevchap posted 10-04-2007 04:36 PM ET (US)
That 15' went 48 mph with the 70 Evinrude,very fun. The 70 Suzuki, because of the added weight and poor aluminum prop gives him 38 mph. His other boat is a 35' Mainship w/single diesel so speed is not his first concern. The conversation was, can the hull handle the weight. The answer is yes.

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Author	Topic: Suzuki DF70 4 Stroke on Classic 15'
Kingsteven18	posted 09-27-2007 10:05 AM ET (US) I've gotten feedback from one person with the exact same setup but I'm looking for all I can get. I know it's heavy, but I can get a 15' in VG condition with a like new DF70 on it for $5K or less, so I'm trying to decide. Thanks.
Tohsgib	posted 09-27-2007 10:51 AM ET (US) Only know like 2 people who have done it and both were happy but said she was a tad stern heavy at rest. Take it for a test run. Hell the engine alone you can sell for over $3k if not thrilled which I think you will be after you move some weight forward.
Kingsteven18	posted 09-28-2007 09:27 AM ET (US) Well, under the front hatch he showed me what he said was 150 lbs. of poured concrete. I might offer less and take my chances.
Tohsgib	posted 09-28-2007 10:22 AM ET (US) I think a couple buckets of leadshot would have been better. Can you get the concrete out?
Kingsteven18	posted 09-29-2007 07:14 AM ET (US) Where there's a will, there's a way. I'd drill holes in in it with a hammer drill which would then leave room for it to crack when struck. I can't imagine the concrete adhering to the fiberglass that well.
JMARTIN	posted 09-30-2007 10:46 PM ET (US) http://i34.photobucket.com/albums/d137/jmartin-/2006trip069.jpg There is a bag of rocks in the bow. It's just fine once up on plane. John
standfas	posted 10-01-2007 02:27 PM ET (US) What is the recommended stern weight for a 15' SS?
Plotman	posted 10-01-2007 04:59 PM ET (US) Here is how I would get it out - drill two holes angled in towards each other - like this \ /, put in a couple of red head anchor bolts, run a metal strap between them, and use that as an eye to pull out the concrete. I'm guessing it will pull out of the anchor well fairly easily. With twin 130s on my Outrage 22, my boat has a stern-heavy static trim. I have 100 lbs of lead shot in each of the two forward rope lockers. Each is held in a piece of 3" PVC pipe with the end caps soldered on. Good lord, pouring concrete into a whaler!
george nagy	posted 10-02-2007 09:29 AM ET (US) Maybe you could just locate the tank(s) under the forward bench seat instead of all that extra permanent weight.
Binkie	posted 10-02-2007 01:32 PM ET (US) plotman, I would like to wager you that your idea won`t work, and the lift will only pick up the bow of the boat unless plastic sheeting was laid down inside the cavity before it was filled with concrete. The only way is to break it up, and there is a good Chance that the glass skin will crack as you are doing it, or is already cracked from the heavy weight of the concrete when the bow slams into waves. You might have a chance if mortar mix was used, but if the fool used concrete with aggregate in it, no way. I would offer less to cover the repair work. Did you ever try to get concrete out of a plastic 5 gallon bucket? Anyone who ever worked in construction, knows it is impossable. You can turn it upside down and slam it to the ground and it won`t budge. If you try to break it out, you will break the bucket. Yes the plastic bucket has some draft (wider at the top than the bottom) Concrete will also stick to metal, an anyone who has ever had to break concrete out of a concrete mixer will attest to. rich
Kingsteven18	posted 10-04-2007 05:00 AM ET (US) I will drill 1/4" holes in it and insert and set off firecrackers. I've heard of people doing that to split stone.
Kevchap	posted 10-04-2007 09:06 AM ET (US) I sold a 15' to a friend this summer who installed his 70 Suzuki 4-stroke on the back. Runs about 38 mph at WOT and gets on plane nicely with up to 4 adults. Floats about 1.5 inches lower than it did with the 70 Evinrude but doesn't pose a problem. Suzuki weighs 100 lbs more than Evinrude. Very quiet, smooth and easy on gas.
Perry	posted 10-04-2007 01:14 PM ET (US) 38 MPH? I have heard reports here of the same DF70 pushing a Montauk to 39 MPH. Nick, what say you?
Tohsgib	posted 10-04-2007 02:04 PM ET (US) I said 39.4 was my best. 38 is possible if set up incorrectly. This is also 2nd hand info so I did not care to comment.
Kingsteven18	posted 10-04-2007 02:15 PM ET (US) Yippee!! I went back to take a closer look. At least he had the brains to line the compartment with blue shrink wrap first. Should make removal (I'd try the lead shot instead) a lot easier. Keep up those performance replies though; I'm just waiting on a price. Thanks. Steve
Perry	posted 10-04-2007 02:55 PM ET (US) My point was that 38 MPH seemed a bit slow on a classic 15 powered with a Suzuki 70 HP 4 stroke when a DF70 on a larger 17 foot Montauk has been reported to reach 39+ MPH.
Tohsgib	posted 10-04-2007 03:12 PM ET (US) I know...I said i got 39.4 on a 17. I have heard people only getting 35+ with a 70 2 stroke so anything is possible. That boat should get 42-46mph if set up right.
Kevchap	posted 10-04-2007 04:36 PM ET (US) That 15' went 48 mph with the 70 Evinrude,very fun. The 70 Suzuki, because of the added weight and poor aluminum prop gives him 38 mph. His other boat is a 35' Mainship w/single diesel so speed is not his first concern. The conversation was, can the hull handle the weight. The answer is yes.