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Old 06 November 2008, 14:18   #11
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Old 06 November 2008, 16:23   #12
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Checked the pressure in the tubes and headed out again got half way across tha bay and thought...will just check the wheels are ok....... "Sh*t where are the bl**dy wheels"

Yep you guessed it, still locked down in the launching position!!!
Been there, done that .

In my case, it was looking aft and seeing all the weed dragging along that gave me the clue

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Old 06 November 2008, 17:15   #13
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I have a bit of a rooster tail off the prop so think I need to play around with the trimming a bit, weight distribution seems fine with a bit of wieght of the front (anchor and some bits). It feels like seems to chine walk a bit on occasionat WOT but I have a few things to experiment with.



Yeah I heard that is sometimes possible, but as the transom is only rated for 25hp and I need to be sure my insurance is valid (used as a safety boat) I can't take the risk.

Cheers

Mike

I had the same concerns with insurance with a 50 on a boat plated for 40 .

My insurance broker wasn't bothered at all , I called to ask before changing the insurance over from my old boat and also wrote down the details on the proposal . they were more interested that it hadn't exceeded the wieght rating and that the top speed was no more than 30kts .
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Old 07 November 2008, 03:58   #14
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Originally Posted by ian parkes View Post
I had the same concerns with insurance with a 50 on a boat plated for 40 .

My insurance broker wasn't bothered at all , I called to ask before changing the insurance over from my old boat and also wrote down the details on the proposal . they were more interested that it hadn't exceeded the wieght rating and that the top speed was no more than 30kts .
Thanks Ian,

That makes it a worth investigating a bit further! Anyone know if a Mariner Marathon 25 can be upped to 30hp? I heard a rumour it was only restricted by a limiting gasket. Time for a bit of googling I think!

Update - just found "Chatts" thread on the conversion and dropped him a PM for info!

M
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Old 07 November 2008, 11:06   #15
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Engine 25 to 30 HP Conversion

This will help, just follow complete procedure, both engines models weights the same 52 KG, the difference is that you will have the extra 5 HP at WOT (Full throttle)

Will only need to remove restricted 25 gasket and change for 30 HP gasket, Tohatsu part N 346-02011-0

http://rib.net/forum/showthread.php?t=25933

Happy Sibbing
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Old 07 November 2008, 17:48   #16
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This will help, just follow complete procedure, both engines models weights the same 52 KG, the difference is that you will have the extra 5 HP at WOT (Full throttle)

Will only need to remove restricted 25 gasket and change for 30 HP gasket, Tohatsu part N 346-02011-0

http://rib.net/forum/showthread.php?t=25933

Happy Sibbing
You also need to advance the timing by 5 degrees by adjusting the linkages- iirc the 25 is set at 18 deg, and the 30 is set at 23deg.
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Old 07 November 2008, 18:03   #17
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Nice story. I did the same thing eons ago with Zodiac Mk IIC. I realized halfway down the harbour...

Being the quick thinking guy I was, I explained to the future Mrs. Stoo#1 that this was intentional and meant to protect my engine in shallow water by merely rolling over the rocks rather than whacking the prop~

I don't think she bought it for a minute...
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Old 08 November 2008, 08:30   #18
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You also need to advance the timing by 5 degrees by adjusting the linkages- iirc the 25 is set at 18 deg, and the 30 is set at 23deg.
According to tech service manual for that engine, the timming is 20 for 25 model and 25 for 30 model, keep in mind that the timming is linked via the throttle link rod to the carb, and both interact together via the advancer arm, with -2 in both cases you won't have a totally opened 180 carb butterfly, near to, but not spot on. With a converted 30 HP will have a better hole shot at wot, moving more weight faster that with a 25.

Happy Sibbing
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Old 09 November 2008, 09:12   #19
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Note: Forgot to mention that timming is marked at the right edge formed by the crankcase mating surface, if's done in middle or oposite will have a nearly -2 difference. Adjust timming by means of stopper A untill carb arm/white roller is in the upper portion of the carb cam with a 180 opened butterfly. Retighten stopper A.

Happy Sibbing
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