SBT Jetski Engines, Parts & Accessories

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  1. #1
    Joined
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    Great Lakes State
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    Default Polaris Airbox Upgrade Kit 1992-1995

    I have 2 Polaris 1995 SL750s. One of them has the "open air flame arrestor" kit issued by polaris installed on it (replaced the clamshell/snorkel design) I had that one done back in 1997 by the dealer. At the time the mechanic told me he "re-jetted the carbs to allow more fuel" and then he showed me how to adjust the fuel mixture on each carb to make sure the fuel mixture was right (based on plug color afte riding it with a load on it). That ski has run awesome for the 8 seasons...and went from 48mph to 52mph.

    My question is this: I bought the same kit for the other SL750 (still has the stock airbox on it, all original) and don't know much about carb jetting. The flame arrestor/airbox kit looks pretty simple to install, but I don't know what size jets I need, which jets, or how to install them. Is it necessary to put new jets in? The Polaris dealership that did the great job on my first ski is no longer selling Polaris.. And the Mechanic is long gone... Any other dealership I talk to wants TONS of $$$$ to do it.

    any help would be greatly appreciated!!

  2. #2
    Joined
    Oct 2004
    From
    Arkansas
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    173

    Default Re: Polaris Airbox Upgrade Kit 1992-1995

    I've been looking for an "open flame arrestor" type to replace my stock air box.

    Give us some paticulars....where you bought it, prices, pics etc
    Thanks.

  3. #3
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    Great Lakes State
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    Default Re: Polaris Airbox Upgrade Kit 1992-1995

    http://www.parkeryamaha.com/index.as...D&ProdID=24770

    It's the factory issued improvement kit used to reduce water ingestion when ski is flipped over. It was reccomended to me back in 1997 by the mechanic I used to deal with regarding my 1995 SL750 (1st one). It also improves air flow and cc volume to carbs. It's similar to all 96+ airboxes.
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  4. #4
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    Arkansas
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    Default Re: Polaris Airbox Upgrade Kit 1992-1995

    Thanks......Even the price is reasonable.

    I was looking in Dennis Kirk and I thought the prices were pretty high.

    Thanks !

    AL D

  5. #5
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    Default Re: Polaris Airbox Upgrade Kit 1992-1995

    No problem... good luck!

  6. #6
    Joined
    Mar 2005
    From
    Wenatchee, Wa
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    60

    Default Re: Polaris Airbox Upgrade Kit 1992-1995

    put the new jets in. you should have got a installation instruction sheet with the kit. i found a copy from the last one i did. polaris says install the102.5 main jets on the 750 engines. and the105 main jets on the 650 engines. why the larger jets on the 650 im not quite sure. low speed jets stay the same. update your fuel pump while your at it if it has not been done yet. dont want to melt downyour engine from lean carbs/ jetting or lack of fuel from weak pump. i and others use the 5 sided mikuni high volume pump. it has two outlets,one goes in original fuel rail inlt.other goes inbetween mag and center carb. you will need to install a tee. some people install two tees between pto and center between center and mag carbs, and block off origional inlet.some use triple outlet pumps duel single outlet pumps and some use threesingle outlet pumps the choice is yours. do not remove the fuel line restricter in the return fuel line. good luck. check your metering diaphrams and fuel filters while you have it all apart,and pop off if you have a gauge. you can buy just the diaphrams by themselves from your seadoo dealer or your yamaha dealer about 18,20 bucks needle and seats about the same price,make sure they are the same size, i believe 2.0. or you can wait a couple days and get complete kits from sbt,

  7. #7
    Joined
    Aug 2005
    From
    Great Lakes State
    Posts
    10

    Default Re: Polaris Airbox Upgrade Kit 1992-1995

    Thanks for the info Frisbee. Also thanks for bthe info on the fuel pump situation. My 1st ski that's had the kit since '97 still has the orig. fuel pump on it. It was just relocated from the intake to the hull via the mod. bracket thets in the kit. Can the mikuni fuel pumps use that same bracket?? Thanks again!

  8. #8
    Joined
    Mar 2005
    From
    Wenatchee, Wa
    Posts
    60

    Default Re: Polaris Airbox Upgrade Kit 1992-1995

    the kits i have installed were on slt model. i just zip tied new pump to the side of the hull instead. with the fuel lines and electrical that were allready there. i sold my wifes sl-700 this spring. i have not been completly forgiven yet. what a fun boat. but people were driving it wrecklessly. so i sold it. bought here a yamaha wave venture. its to slow,it wont spin, i want a faster boat she says. yup! I says.

  9. #9
    Joined
    Oct 2004
    From
    Arkansas
    Posts
    173

    Default Re: Polaris Airbox Upgrade Kit 1992-1995

    Do you really have to change the jets when you install this up-graded air box?

    I just hate to mess with something that is working OK.

  10. #10
    Joined
    Aug 2001
    From
    Las Vegas, Nevada
    Posts
    1,220

    Default Re: Polaris Airbox Upgrade Kit 1992-1995

    Quote Originally Posted by dierdorf
    Do you really have to change the jets when you install this up-graded air box?

    I just hate to mess with something that is working OK.
    Let's see you just changed the airflow characteristics of your carburetors...they are now capable of flowing more air...If you do not increase the available fuel, you will be runing lean, and could very well seize the engine. At that point your ski would no longer be "working OK".

    I would also verify wether or not you need to adjust the pop-off to compensate for the lower restriction of the open element F/A vs. the original design.
    John Kubiak
    Powersports Technical Training Professional
    Las Vegas, Nevada
    Sea-Doo Tech 13736
    PWC Tech since 1988 (22 years)
    PowerSports since 1976 (34 years)
    NEVER BUY TIRES AT A "BLOW-OUT" SALE
    Please do not use Private Messaging, use the forums.

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