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  1. #1
    PWCToday Newbie REKLES's Avatar
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    Aug 2011
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    lake havasu Az/orange county Ca
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    650 and 300sx father son project help (newbie)

    Hello all,
    like the title says, i wanted to start a new project with my son this winter when we are not dirt bike riding. I am completely new to jet skis, and read alot more than i post.
    My goal is to have the 300sx be able to hang with my 650sx Eventually with my 60lbs son on it. problem i cannot find any hop up parts or vary little info on the 300sx.

    Oh yeah this is a budget build too so im not trying to go broke getting these skis going and hopefully fast.

    both the 650 and the 300 need new top ends so i plan to take both engines out and make them run on premix. the 650 is missing the exhaust and the electronics.
    I am in this project for $150 and im looking to spend $600 into the engines alone. I know right off the bat im gonna get a westcoast head for the 650 and exhaust to but what other tips and tricks should i do to the engine? also the 300 is basically a 650 less a cylinder so most of the stuff i do to the 650 should work the same for the 300 right?

    any help on how i should approach this would be greatly appreciated

    THANKS

  2. #2
    PWCToday Newbie REKLES's Avatar
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    Re: 650 and 300sx father son project help (newbie)

    cool thanks

  3. #3
    resident guru kaw650sx1993's Avatar
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    Jun 2011
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    946

    Re: 650 and 300sx father son project help (newbie)

    The 650 and 300 is a little difrrent if you look at the hulls, i dont know how much similar underneath them are though. The js300 and sx300 are very similar. i would bore the the 300, mill the head, maybe 38/44 SBN carb,flame arrestor and get a exhaust off ebay for it for $250. The 300's are the easiest engine ever, i love them ther so easy to work on and everything.

  4. #4
    PWCToday.com Is My Home Away From Home The Greygoose's Avatar
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    Sep 2005
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    Re: 650 and 300sx father son project help (newbie)

    Welcome !

  5. #5
    PWCToday.com Is My Home Away From Home WB1994's Avatar
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    Jun 2005
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    New Hampshire
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    Re: 650 and 300sx father son project help (newbie)

    Find a running 650 for $250-300 ish and slap it in the 300 SX.

    Welcome.

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