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Old 06 October 2009, 00:00   #1
Country: USA
Town: tununak
Boat name: fv ravin madd
Make: achillis & avon
Length: 4m +
Engine: outboards
Join Date: Jul 2009
Posts: 24
05 9.9 merc bigfoot gearcase

I have a go at buying a 25 inch shaft merc four stroke 9.9 hp 1000 us maybe 20 hours like new can I reduce it to 15 or 20 with a kit ? anyone had one did they like it are they hard core like the idea of the big 20 hp wheel Kim

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Old 08 October 2009, 08:09   #2
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,649
Merc tends to use a one piece gearcase with two or three versions for the Std, L & XL legs. (unlike the 1970s Johnsorudes, who used case extensions to make the leg longer). So, to shorten the shaft, you'll need at least :

- New gearcase
- New drive shaft
- New water pipe
- Complete set of gaskets for that lot
and that assumes the same tiller tube & mounts for each leg length, which in tuirn assumes similar swivel bracket. Without a serial number to check parts lists canlt be more definite.......

Unless you find someone chucking out a shortshaft version of your motor for a song, I think you'd probably be as cheap just selling it & buying what you actually need.

9D280 is offline   Reply With Quote
Old 08 October 2009, 15:15   #3
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,347
You will need, a driveshaft housing, Drive shaft, Water pick up tube, Gearshift shaft. Powerhead Gasket, Adaptor plate gasket, Gearhousing seal kit. Just as a starter.
I think the cost of all that stuff will be more than you are going to pay for the engine!!
Turbodiesel is offline   Reply With Quote

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