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Old 15 January 2014, 15:12   #21
Country: UK - England
Boat name: Carpe Diem
Make: Ribeye 650S
Length: 5m +
Engine: Yamaha F150
Join Date: Oct 2012
Posts: 548
I have found the article I was looking for and it looks like a few of these nutters have done the mod with positive results (placebo or not)

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Old 15 January 2014, 15:33   #22
Trimix's Avatar
Country: UK - England
Boat name: Hysucat
Make: Hysucat
Length: 8m +
Engine: Twin Suzuki 175's
MMSI: 235102645
Join Date: Jun 2013
Posts: 861
Well you might get a tiny improvement, but I would be concerned about a change in the mixture that isnt dealt with by the standard ECU. Just how much variation can it cope with ?

On one of my motorcycles with an ECU, even changing the baffels in the exhaust required a remap to get it working properly and time on the dyno.

The power graph with just the mod to the gas flow and standard ECU was all wrong, only got an across the range improvement after re-mapping.

But its worth a try, just hope it dosent go pop

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Old 15 January 2014, 16:13   #23
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Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,233
Originally Posted by PeterM View Post
The 50 efi/injected shares block with the 60 & 70.

Makes sense that with the ecu relearning the flows out will allow more air in...

The most simple way to increase horses is to let it breath easier....

What's the worst that can happen!
It burns wrong and blows a hole in the head?

As 9d280 says there are usually only minor differences between engines in a series - but to be sure you would need to trawl the 'microfiches' to see if anything else physical (e.g. mine needs diff carbs and diff exhaust manifold to upgrade) has to change. Some of the old small 2 strokes were really about as simple as you suggest though. I'd have thought that facy electonics made it easier for them to differentiate engines in a way that is not user-upgradable though.
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