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  1. #1

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    gpr lost top end speed

    my gpr has lost alittle top end speed. this spring i installed a ppk seal kit on the pump shoe and installed a riva intake grate and new ride plate. when first testing the ski i was getting around 60-63 on the dream-o-meter. i gps the ski at 60 but the pump broke seal and i pulled everything apart and used more 4200 this time and took care and cleaned up all the excess 4200 and my ski has lost about 10 mph on top-end. compression is good on all cylinders 110,112,110 across the board. i wonder where i lost the speed? please help.


  2. #2
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by rich.allen View Post
    my gpr has lost alittle top end speed. this spring i installed a ppk seal kit on the pump shoe and installed a riva intake grate and new ride plate. when first testing the ski i was getting around 60-63 on the dream-o-meter. i gps the ski at 60 but the pump broke seal and i pulled everything apart and used more 4200 this time and took care and cleaned up all the excess 4200 and my ski has lost about 10 mph on top-end. compression is good on all cylinders 110,112,110 across the board. i wonder where i lost the speed? please help.
    possible pump shoe hanging to low and creating drag.

  3. #3

    Join Date
    Jun 2011
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    hopewell,Va.
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    139
    found out yesterday my dream-o-meter has taken a dive and won't read passed 53mph. i took my gps with me yesterday and the ski gps at 60.1 with about 2 gallons of fuel in the tank. thanks for the input. i am thinking about pulling my engine and do a complete upper and lower rebuild and install a new head,free-flow exhaust and some pump mods down the road. is there a good shop that i can send my jugs and get them bored out for bigger pistons. everything on the motor is oem parts.

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