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  1. #1

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    gp1300r cylinders on a gp1200r crank

    hello everyone!
    just got some 1300 cylinders and was wondering whether to buy stock 1300 pistons or upgrades. ..and what kind


  2. #2

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    Oem pistons are the best but the cost is super high close to $275.00each ( with rings ,pin. clips) Next in line is Pro X which is about $140.00 for the kit, the other ones on the market are junk IMO. Remember you must order the correct piston size to match with the number stamped on the cylinder. Tommy Jordan

  3. #3

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    wow...big money
    thanks for the heads up!
    any idea if the r & d powervalves from the 1200 fit the 1300?
    also, do the r & d high compression heads swap from the 1200 to the 1300?

  4. #4

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    forget the r & d 's . What about the riva gas valves from a 1200 to a 1300?.....so many deals on craigslist so little time

  5. #5
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    Quote Originally Posted by gixxedraider View Post
    forget the r & d 's . What about the riva gas valves from a 1200 to a 1300?.....so many deals on craigslist so little time
    they will work, but the gillotines will need to be matched to the exhaust port

    13R pv motors rarely go bad... IMO stick with the electric valves and install a waveeater kit

  6. #6

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    when you say gullatine i think you are talking about the end of the powervalve, closest to the piston. What about the r & d high compression heads???...also,..on the number 1 cyclinder on the 1300, there is a temp. sensor; can this be wired to either of the two harnesses that plug into the exhaust sensors. [d-plate called for removal of the upper; and holeshot mod has the other connected;but ziptied to the hull (where it is useless)]...SUGGESTIONS?! ....ALSO, will the 110 , 125 jetting still work?

  7. #7

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    anybody out there?

  8. #8

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    Quote Originally Posted by gixxedraider View Post
    anybody out there?
    1300 cylinders require the use of a cylinder head designed for a 1300 motor oem or aftermarket but it must be for a 1300, The temp sensor on a 1300 cyl is not used on a 1200 carb engine just remove it. The sensor was for efi use only. 110 pilots and 130 mains work good on a 1200 with 1300 cyls. Hope th is helps. Tommy Jordan

  9. #9

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    that's it, thank you!

  10. #10

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    temp sensor q's ...again

    i kn ow you said the sensor cant be used; but; i hate runniing w/out a sensor. and the number one cylinder runs hotter than the rest.......so where better to have a sensor ....................sorry to ask again, you seemed confident in your reply; but are you sure it cant be wired in to 12r's wiring?

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