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  1. #1
    dewzee1200's Avatar
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    Converting a GP1200R to 1300r with Reliability Mods

    I am converting a 2000 Yamaha GP 1200r SKI to 1300r with advice obtained from the GH Forum


  2. #2
    dewzee1200's Avatar
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    First step was to obtain new 66V Crankshaft from Brandon at Boats.net - he matched best online price with free shipping

    Recomendation: request and demand DOUBLE BOX for all crankshaft shipments - my first one arrived with piston rod protruding thru cardboard

    refusing the delivery - obviously created an unwanted delay

    THEN after 2nd one arrived without issue ; the crank was shipped to Crankworks for T & W
    Click image for larger version. 

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    note the weld on the pic

    Check out discussion --> http://www.greenhulk.net/forums/show...d-weld-a-crank

    I also obtained valuable knowledge from OS Bill's crankshaft purchase thread on this forum

    link--> http://www.greenhulk.net/forums/show...a-Cranks-Parts
    Last edited by dewzee1200; 08-31-2011 at 10:19 AM.

  3. #3
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    i did the same type of project a few years ago as my first ski build and i still have the ski, its got 220 hours on the clock now and been a very reliable old girl that spanks new skis silly.

    best of luck with the build and please do keep posting pics and updates.

  4. #4
    dewzee1200's Avatar
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    Next I sent 3 x 66v rough cylinder cores + PowerValves + 1300R Pro-X pistons to Langcourt Advanced Cylinder Technologies --> http://www.langcourt.com/ for Match Boring

    Glen at Langcourt was very helpful and he shipped my components to Lowell Horning at 2 Cycle Porting --> http://2-stroke-porting.com/ for the expert porting work on cylinders - I later shipped the top half of my crankcase for porting as well

    Lowell provided a wealth of information to assist with my conversion-- he also performed his piston modifications - Balancing pistons ETC
    I opted for the special piston coatings on the piston crowns and the piston skirts -- Lowell handled this with the coating vendor RAM ProLine LLC www.ramproline.com

    A special thanks to Lowell for his patience and understanding since I had a lot to learn about 2-cycle performance mods

    There is something special about the feeling you get when opening a box like this - Click image for larger version. 

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ID:	251062 Big Boy Christmas !
    Last edited by dewzee1200; 08-31-2011 at 07:50 PM.

  5. #5
    dewzee1200's Avatar
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    Click image for larger version. 

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    To provide additional airflow into the engine compartment I cut out the black plastic on the right side under the Silver ( 2000 year) colored side fairings on my GPR see Link --> http://www.greenhulk.net/forums/show...airings-on-GPR for other airflow mods

    Since I do not like to remove parts when a simple loosening will do -- I loosened the Fairing at the botton - 2 screws and carefully forced it away from HULL and inserted blue shop towel (shown in pic)

    NEXT using a screwdriver I pried the BLACK Plastic away from the hull toward the fairing ( this would insure that I did not touch the Hull ) -You can see how I drew my cut line with silver Sharpee marker in the picture

    Then using a torch ( away from any fuel - of course - duh) I heated a large kitchen knife and carefully cut the black plastic like butter on the marked line - it only took 3-4 heatings of the knife. I was careful not to touch the hot knife to any other plastic or the hull. This worked to prefection - no filings or cut plastic residue to clean up and when I released the black plastic part -it receded back out of view -- covered by silver fairing - thus covering the cut plastic edge .

  6. #6
    dewzee1200's Avatar
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    Click image for larger version. 

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    Carb REBUILD work was done by OS Bill - You can see from BEFORE pics what a challenge the job was !

    Many thanks to Bill for his assistance !!

  7. #7
    dewzee1200's Avatar
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    Click image for larger version. 

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    You can see from AFTER pics that Bill could not stand to deliver anything less than perfect !

    Bead Blasted and Painted -- Bill's Da Man!!

    These pictures do not do the work the justice it deserves - the carbs look NEW

  8. #8
    dewzee1200's Avatar
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    Click image for larger version. 

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    After cleaning all thread holes and bathing the cases and cylinders

    I have my Crankcase together with 1211 and I will let it sit a few days to cure

    I followed the Forum Thread --> GPR Crank installation and crankcase sealing link --> http://www.greenhulk.net/forums/show...nkcase-sealing

    Next - I will be setting up PowerValves and adding anodes to my Ported Cylinders

  9. #9
    dewzee1200's Avatar
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    Next is Pump Shoe seal with 4200

  10. #10
    dewzee1200's Avatar
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    Quote Originally Posted by izz0 View Post
    i did the same type of project a few years ago as my first ski build and i still have the ski, its got 220 hours on the clock now and been a very reliable old girl that spanks new skis silly.

    best of luck with the build and please do keep posting pics and updates.
    Thanks for the support izz0 -- I hope to make it to Australia one day -- Are you a Steve too?

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