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riverman
Joined: 12 Dec 2010
Posts: 23
Location: Grande Prairie
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 Posted: Tue May 03, 2011 9:59 am Post subject: swapping sportjet gearbox ratio 1.25-1 / 1.15-1 |
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| Does anyone know if the 250 opti sportjet gearbox gears (1.15-1) be put in a 175 sj gearbox (1.25-1) ? I just need to know if the gears will fit ? |
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Boomhower
Joined: 03 Nov 2007
Posts: 995
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| Posted: Tue May 03, 2011 2:51 pm Post subject: |
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| No. The pinion shaft that slips into your motor is longer with the 250 than the 175,200 & 240. |
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riverman
Joined: 12 Dec 2010
Posts: 23
Location: Grande Prairie
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| Posted: Tue May 03, 2011 3:56 pm Post subject: |
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| I didn,t think it could be that simple , do you think a machine shop could make this work without it becomeing rediculously complicated and unrelyable ? |
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Boomhower
Joined: 03 Nov 2007
Posts: 995
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| Posted: Wed May 04, 2011 1:25 pm Post subject: |
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| I dont think its do-able with the stock 250 pinion gear. |
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riverman
Joined: 12 Dec 2010
Posts: 23
Location: Grande Prairie
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| Posted: Fri May 06, 2011 11:53 am Post subject: |
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| Thanks for your input Boomhower , do you think the 250 is long enough to machine down and respline for my 175 ? A fellow on another website said they did this swap into a 240 sj ? Thanks |
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ntjetboater
Joined: 15 Jun 2005
Posts: 401
Location: Land of many rivers
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| Posted: Fri May 06, 2011 12:53 pm Post subject: |
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now i'm getting curious..what would the benefit be ? Faster?
_________________
If you ain't hittin bottom you ain't jetboatin! |
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riverman
Joined: 12 Dec 2010
Posts: 23
Location: Grande Prairie
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| Posted: Fri May 06, 2011 1:04 pm Post subject: |
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| My objective is to reduce rpm at any given speed . less RPM = quieter , easier on motor , possibly better fuel consumption ? ....I suspect top speed would actually be slightly reduced with this swap as 175 may have trouble pulling these tall gears . If I can make the pinion gear/shaft fit by machineing it I will be doing this swap and report my results . |
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