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Thread: 1300 cylinders

  1. #1
    2000 GPRXP 4tec shooter98xpl's Avatar
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    1300 cylinders

    I would like to maybe purchase some 1300 cylinders that would work on a 2000 gpr. I guess they need to have the power valves. How would I go by getting this to work?
    SHOOTER


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    ABBOTT's Avatar
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    if you do this, it will work fine but you will need some 84mm pistons to go along with it. Timing may need to change as well (i think). I would give Kerry a call - he can do the whole thing for you instead of you having to worry about all the little details of it. Just my opinion.

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    2000 GPRXP 4tec shooter98xpl's Avatar
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    well I was talking with someone and thought I'd get on here and see what all you would have to do to convert a 1200 to a 1300. I really don't think there is much gain in top end speed wise when going from a 1200 to a 1300. I just see bottom and maybe some midrange gains. I might be wrong, if so, please explain. Thanks.
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    ABBOTT's Avatar
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    well look at it this way --the stock speeds on a 1200cc (80mm Pistons) from the dealer were about 62.

    the stock speeds on a 2003-2004 1300cc (84mm Pistons) are about 64mph.

    2005 & 2006 boats are running same 1300cc's but are getting faster speeds (up to 66 & 67mph stock) just due to the high pressure pump change, and the motor doesn't utilize power valves anymore. The hull is lighter as well.

    You could bet on at least 2 mph for the 100cc upgrade without changing anything else.

    So if you are going to big bore your ski---then you may as well go as big as you can because it's going to cost the same. So you can spend the money to go 2 mph faster or you can spend the EXACT same amout and go to a 1400cc or bigger. See where i am going with this?
    Doing otherwise would be like going to the gas station offering free gas and only taking half a tank-----because all the bore/renick jobs are all the same and bigger pistons aren't any more expensive than the smallest ones out there.

    Top speeds will all vary depending on certain set-ups. When you get into the 1400cc range--your talking about some serious power (even without porting).

    I hope that this helps.

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    2000 GPRXP 4tec shooter98xpl's Avatar
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    so if they went to a 1400 cc setup, your saying there is a 4-5 mph gain? Thats without changing anything else except the bore and pistons.
    If I had someone bore out the cylinders, where can I send them to get nikasild?
    Abbot, as always, thanks man.
    SHOOTER

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    ABBOTT's Avatar
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    send everything to Kerry---look at my signature and read his info. He can do anything you want to have done to your motor. You should call him--he would love to talk with you about it.

    1400cc---from a 1200cc ---5mph gain?? HELL YES AND THEN SOME. Right now just by adding an angled R&D skegged ride plate will give you 3 or 4 by just bolting that on.


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    Quote Originally Posted by shooter98xpl
    so if they went to a 1400 cc setup, your saying there is a 4-5 mph gain? Thats without changing anything else except the bore and pistons.
    If I had someone bore out the cylinders, where can I send them to get nikasild?
    Abbot, as always, thanks man.
    SHOOTER
    You can just your jugs bored out? That might save you some money?

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    2000 GPRXP 4tec shooter98xpl's Avatar
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    Abbot, I have an angled skeg plate from Jim, there was no 3 to 4 mph gain from it. But I am comparing it to a group K ride plate.
    I am not the one getting the mod done, its information for someone else. I guess I'll buzz Kerry and talk with him and see what he has to say.
    SHOOTER

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    ABBOTT's Avatar
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    Quote Originally Posted by shooter98xpl
    Abbot, I have an angled skeg plate from Jim, there was no 3 to 4 mph gain from it. But I am comparing it to a group K ride plate.
    I am not the one getting the mod done, its information for someone else. I guess I'll buzz Kerry and talk with him and see what he has to say.
    SHOOTER
    I am talking about 3-4mph going from a stock ride plate straight to an angled skegged R&D. If your coming from a GK Plate, then i will have no idea because i have no experience with their plates. Kerry will know the specs much better than i ever will - i believe he has tested everything under the sun.

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    Moderator RX951's Avatar
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    I would like to maybe purchase some 1300 cylinders that would work on a 2000 gpr. I guess they need to have the power valves. How would I go by getting this to work?

    2fast4u has a 1300 top end for sale.

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