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  1. #1

    "06 GP1300R Rebuild

    Getting started on a Lowell 1390BB & porting work and wondering if anyone can give me a good place to start on the impeller. I see all kinds of sizes on threads but they seem to be all over the place. I will be using the stock pump. I am now using a 14-20 solars pulling 7160rpm with a stage 2 kit. I know this will be way off after porting & BB. Any help will be appreciated.

  2. #2
    sleeplessnMS's Avatar
    Join Date
    Mar 2006
    IMPROS DF 14/24 would be a good start ya will be able to go up or down a half degree w/o any probs should get ya right there. I run a impros df 14/23.5 but rpm's run a little higher than most.

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