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Old 20 September 2010, 03:14   #1
Country: Other
Boat name: Madueño
Make: Zodiac
Length: 7m +
Engine: Suzuki df250
Join Date: Apr 2006
Posts: 76
Power Up Yamaha from 6 to 9.9 hp

I have a 6 hp Yamaha and I would change it to 9.9. Anyone knows that there are parts that need to change the engine ?(I've seen the engine parameters are identical)
Video of the boat

medlineIII is offline   Reply With Quote
Old 20 September 2010, 11:16   #2
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,614
Not off the top of my head, but if you clicky this
and once loaded click on the "outboards" link in the "parts lists" section. Drill down to your engine.

Now the boring bit. Once you have found yours, open another browser window & get the two engines side by side. All you can do is go through the entire parts list (and I mean the whole thing - it may be as simple as a carb change, it may be a wole lot of parts working together to keep the horses at bay.

One thing to be aware of is that the 9 may have different stuff on the transmission (e.g. gear ratios, bearings etc), so you really must go through the whole lot to be sure.

I forget when, but therre was a thread a while ago where Locozodiac showed that apart from the block, not a lot else was similar. The cost of the spares to upgrade was similar to trading it in for the bigger engine! My memory says it was a Tohatsu, but have a search - there's plenty of threads on this subject!

9D280 is offline   Reply With Quote
Old 20 September 2010, 15:36   #3
Country: UK - England
Town: London
Boat name: Yellow Peril
Make: Ribcraft
Length: 5m +
Engine: Yamaha 100 (2T)
Join Date: May 2006
Posts: 82
I have compared the parts diagrams as described.

If a 2-stroke, you can make it an 8 by swapping the carb and the exhaust manifold. No possibility to go to 9.9.
hobnob is offline   Reply With Quote

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