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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

palehorse is offline   Reply With Quote
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: 4,538
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: 1,332
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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