Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 25-07-2008, 16:47   #1
cruiser

Join Date: Nov 2004
Posts: 4,525
Help Needed With Caribe L9 & Honda 8hp Classic 4 Stroke

I got a Honda 8hp Classic 4 stroke short shaft engine about a month ago.

We got it for fuel economy since the dinghy is basically our car.

I have been running it and not thinking much of the water that comes flying up when I (carefully) come off plane, engulfing and partially submerging the powerhead of the outboard.

Recently, I had the cover off to see how the oil level was doing and noticed standing water in and around the engine block and exhaust manifold. NOT GOOD!

This standing water obviously comes from the motor being so low that it gets swamped when coming off plane. Also, when you stand at the stern, the plastic housing cover touches the water's surface. NOT GOOD AGAIN!

Does anyone have a Caribe L9 and a Honda 4 stroke 8hp or larger on it? If so, how the heck do you keep it from going submarine?

This is a problem I can't take lightly. It's a $2000 engine!

Thanks,
__________________

__________________
ssullivan is offline   Reply With Quote
Old 27-07-2008, 11:44   #2
Registered User
 
slacker's Avatar

Join Date: Nov 2006
Location: San Diego and Mazatlan
Boat: Gulfstar 37 "SLACKER"
Posts: 147
Water over the stern

We have a 9L and a Yamaha 15 enduro. Yes you really do have to be carefull when coming of a plane. I guess we have had the dingy long enough that we dont think about it any longer. We just make sure to come off slowly or make a 90 deg turn when we chop the throtle. The engine cover of our Yanaha fits so snugly we have never had a problem with water pooling inside. Could you drill some drain holes some where? Possible you could look at replacing the gasket between the cover and the powerhead.

Mike
__________________

__________________
slacker is offline   Reply With Quote
Old 27-07-2008, 13:50   #3
cruiser

Join Date: Nov 2004
Posts: 4,525
Quote:
Originally Posted by slacker View Post
We have a 9L and a Yamaha 15 enduro. Yes you really do have to be carefull when coming of a plane. I guess we have had the dingy long enough that we dont think about it any longer. We just make sure to come off slowly or make a 90 deg turn when we chop the throtle. The engine cover of our Yanaha fits so snugly we have never had a problem with water pooling inside. Could you drill some drain holes some where? Possible you could look at replacing the gasket between the cover and the powerhead.

Mike

Thanks, Mike.

I was hoping somebody had a Caribe on this forum and a bigger (heavier) engine on it.

So does your Yamaha go underwater to the point where the cover and the main body come together when you step in the boat? I'm only 160lbs, so I'm not thinking my weight is a factor.

Also, how about coming off plane? No matter how carefully I do that, I get a wash that goes above the cover.

I was thinking of retro-fitting a new outboard mount onto the dinghy to get the outboard up out of the water some more.

Drilling holes was a thought, but in all honesty, I don't feel I should have to modify a brand new, $2000 engine when I bought it from a place that also sells Caribe dinghies. I'm a little bit disgruntled that I'm getting salt water into it based on their suggestion of what OB I should have bought.
__________________
ssullivan is offline   Reply With Quote
Old 27-07-2008, 14:19   #4
Senior Cruiser
 
Therapy's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: W Florida
Boat: The Jon boat still, plus a 2007 SeaCat.
Posts: 6,894
Images: 4
I am pretty sure there is a drain hole already, at the back.

It would seem odd to me if it didn't.

Can't speak to the swamping. Strange.
__________________
Therapy is offline   Reply With Quote
Old 27-07-2008, 14:22   #5
Senior Cruiser
 
Vasco's Avatar

Cruisers Forum Supporter

Join Date: Apr 2004
Location: Toronto
Boat: CS36Merlin, "La Belle Aurore" Ben393 "Breathless"
Posts: 7,137
Sean,

Too much weight aft for that little dink. Can be the engine or you or both. Is the gas tank back there too?
__________________
Rick I
Toronto in summer, Bahamas in winter.
http://groups.yahoo.com/group/beneteau393/
Vasco is offline   Reply With Quote
Old 27-07-2008, 14:23   #6
cruiser

Join Date: Nov 2004
Posts: 4,525
Thanks, Therapy.

It is strange, isn't it?

The oddest part is it sits quite a bit lower in the water than the Honda manual suggests it should, even when nobody is in the dinghy.
__________________
ssullivan is offline   Reply With Quote
Old 27-07-2008, 14:25   #7
cruiser

Join Date: Nov 2004
Posts: 4,525
Quote:
Originally Posted by Vasco View Post
Sean,

Too much weight aft for that little dink. Can be the engine or you or both. Is the gas tank back there too?
The engine is 99lbs.

I'm 160lbs.

The 3 gallon gas tank is usually in the stern, but I did move it forward with no
noticeable change in the outboard's position in the water.
__________________
ssullivan is offline   Reply With Quote
Old 27-07-2008, 14:33   #8
Senior Cruiser
 
Therapy's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: W Florida
Boat: The Jon boat still, plus a 2007 SeaCat.
Posts: 6,894
Images: 4
Without seeing it I can't really say, but redoing (raising) the transom mount would be in order. But I don't know how much you can raise it without cavitaion. It depends on the depth of the hull.

PS, My honda 15 has a pretty loose fitting cover. A new gasket won't help. It is the design.
__________________
Therapy is offline   Reply With Quote
Old 27-07-2008, 14:36   #9
cruiser

Join Date: Nov 2004
Posts: 4,525
Quote:
Originally Posted by Therapy View Post
Without seeing it I can't really say, but redoing (raising) the transom mount would be in order. But I don't know how much you can raise it without cavitaion. It depends on the depth of the hull.

PS, My honda 15 has a pretty loose fitting cover. A new gasket won't help. It is the design.
Agreed about the loose fitting cover. It's just the way it's designed.

I think I probably will go with the transom modification. I have a lot of room to lift the motor (I think - will measure soon). It's almost like the motor was expecting a transom that sits higher off the water - and this *is* a short shaft model.
__________________
ssullivan is offline   Reply With Quote
Old 27-07-2008, 14:48   #10
Senior Cruiser
 
Therapy's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: W Florida
Boat: The Jon boat still, plus a 2007 SeaCat.
Posts: 6,894
Images: 4
The manual will show you with a picture but it is pretty standard.
A line extending out from the keel should hit the motor 1" above the cavitation plate.
Up the motor to that point.
What is that line hitting on the motor now?

PS. On my setup (16' Jon with said 15HP) I had to cut it down because 1" was not enough. I had to go to 2" because with only me it just rides high and fast.
__________________
Therapy is offline   Reply With Quote
Old 27-07-2008, 14:54   #11
Registered User

Join Date: Apr 2006
Posts: 4,413
Can you ease off of plane without the swamping? Your motor sounds like it's too low in the water. Move as miuch weight forward even get a 6 gallon tank and put it in the bow. and sit forward. Your boat is not trimmed properly.

I am getting a new motor, the honda was nicked in RI, I decided to stay with the 4 stroke but get a lighter motor. Yamaha is 15 pounds light. I still need the block and tackle to lift it onto the rail, but I expect better trim and performance - same HP.
__________________
Sandero is offline   Reply With Quote
Old 27-07-2008, 14:56   #12
cruiser

Join Date: Nov 2004
Posts: 4,525
Quote:
Originally Posted by Therapy View Post
The manual will show you with a picture but it is pretty standard.
A line extending out from the keel should hit the motor 1" above the cavitation plate.
Up the motor to that point.
What is that line hitting on the motor now?

PS. On my setup (16' Jon with said 15HP) I had to cut it down because 1" was not enough. I had to go to 2" because with only me it just rides high and fast.
The water is 9.5" to 10" above the cavitation plate, when I am in the boat, near the stern, measuring it. The manual with the generic picture suggests 2" max above the cavitation plate.

How can it be so off??

Is there not some kind of standard followed?
__________________
ssullivan is offline   Reply With Quote
Old 27-07-2008, 15:00   #13
cruiser

Join Date: Nov 2004
Posts: 4,525
Quote:
Originally Posted by defjef View Post
Can you ease off of plane without the swamping? Your motor sounds like it's too low in the water. Move as miuch weight forward even get a 6 gallon tank and put it in the bow. and sit forward. Your boat is not trimmed properly.

I am getting a new motor, the honda was nicked in RI, I decided to stay with the 4 stroke but get a lighter motor. Yamaha is 15 pounds light. I still need the block and tackle to lift it onto the rail, but I expect better trim and performance - same HP.
I can ease off plane without swamping, but I use a trick... easy off slowly and then blast a little full throttle to knock the wake back as it hits the outboard. This keeps me from swamping and keeps the wake from *breaking* over the outboard.

I really don't have any other way to trim the boat at all. I've moved the tank forward and it does nothing noticeable. I sit about amidships, twisting the throttle with my fingertips and arm extended as far as I can without losing my grip on the outboard.
__________________
ssullivan is offline   Reply With Quote
Old 27-07-2008, 15:42   #14
Senior Cruiser
 
Therapy's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: W Florida
Boat: The Jon boat still, plus a 2007 SeaCat.
Posts: 6,894
Images: 4
Quote:
Originally Posted by ssullivan View Post
I can ease off plane without swamping, but I use a trick... easy off slowly and then blast a little full throttle to knock the wake back as it hits the outboard. This keeps me from swamping and keeps the wake from *breaking* over the outboard.

I really don't have any other way to trim the boat at all. I've moved the tank forward and it does nothing noticeable. I sit about amidships, twisting the throttle with my fingertips and arm extended as far as I can without losing my grip on the outboard.
I have done that before.

I use two different length PVC extensions.
__________________
Therapy is offline   Reply With Quote
Old 27-07-2008, 15:44   #15
Senior Cruiser
 
Therapy's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: W Florida
Boat: The Jon boat still, plus a 2007 SeaCat.
Posts: 6,894
Images: 4
Quote:
Originally Posted by ssullivan View Post
The water is 9.5" to 10" above the cavitation plate, when I am in the boat, near the stern, measuring it. The manual with the generic picture suggests 2" max above the cavitation plate.

How can it be so off??

Is there not some kind of standard followed?
That is not the measurement.
The one you need is a line off the hull bottom..
Hold a yardstick (or whatever) against the hull bottom sticking out the back of the boat. Where does the stick hit the drive housing?
__________________

__________________
Therapy is offline   Reply With Quote
Reply

Tags
4 stroke, honda

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
2 stroke vs 4 stroke? Shaft length? Piper'sGirl Engines and Propulsion Systems 6 06-06-2008 15:08
Wanted 50ft + Classic Sail Yacht to Live A Board & Charter tonyclark Monohull Sailboats 0 11-05-2007 00:12
2 stroke vs 4 stroke kickers Capct Powered Boats 7 08-05-2007 13:07



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 11:56.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.