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  1. #1

    Unhappy coffmans 951 gsxl pipe

    does any one have expirience in the coffmans gsxl pipe . on their website it explains all you have to do is bolt it on with stock flame arrestors and stock jetting and " recommended" to take 1 -1/2 a degree off the stock impeller and this shoud have you past the rev limiter. I bolted on the pipe kept every thing stock just like they say in the instructions hooked up my revlimter and water injection system and even threw on a concord 15/20 and i was only seeing around 6940 rpms . oh and i tried this with the stock the stock impeller and was only seeing around 6780 rpms what would i have to do in order to see 7350 - 7400 rpm's .

    if they say that this is what it should do ,why is it not working for me?

    please help!


  2. #2
    Duke's Avatar
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    Its a challenging process to get those pipes to work in the rpm range they need to be. Did you buy the pipe new or used?

    -Need either reprogramed CDI, Advent ignition, or microtouch.
    -Carbs must be completely regetted
    -15-20 concord prop needs to be repitched to 14-19
    -waterbox must be dried out and routing is changed
    -Pipe like Rinaldi reeds to help get over the hump
    -Base timing must be right
    -Exhaust resonater must be removed
    -larger GSX limited nozzle helps get into the range but not fastest
    -Added compression helps 165psi
    -Squish shoulden't be less then .070 IMO (Deto)

    Just a few things. I can try to break down everything it took to get my wifes running around 70.

  3. #3
    96XPSS's Avatar
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    If you bought it used make sure you pressure test the pipe (water jacket) for leaks.

  4. #4

    Red face coffmans pipe

    thanks for the input guys , i was really just testing the pipe to see if it does what they say " just bolt it on a stock engine and and you should see a good 3 - 4 more miles an hour " which should probably equate to about aleast 7100 rpms, but i guess that myth is busted.

  5. #5
    96XPSS's Avatar
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    Quote Originally Posted by howiegsxl View Post
    thanks for the input guys , i was really just testing the pipe to see if it does what they say " just bolt it on a stock engine and and you should see a good 3 - 4 more miles an hour " which should probably equate to about aleast 7100 rpms, but i guess that myth is busted.
    Welcome to the world of aftermarket PWC parts!


  6. #6
    Duke's Avatar
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    Quote Originally Posted by howiegsxl View Post
    thanks for the input guys , i was really just testing the pipe to see if it does what they say " just bolt it on a stock engine and and you should see a good 3 - 4 more miles an hour " which should probably equate to about aleast 7100 rpms, but i guess that myth is busted.
    That pipe takes a lot of work to make it sing. If its not turning 7400+ you'll be better off with a stock pipe and a 15-20 concord IMO.

  7. #7
    Duke's Avatar
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    Quote Originally Posted by 96XPSS View Post
    If you bought it used make sure you pressure test the pipe (water jacket) for leaks.
    Ditto on that. I've got one that looks like brand new with a giant crack. Floods the whole exhaust with water and wouldn't turn 6500 rpms.

    Anyone need a Coffman pipe for XPL. Looks new!!

  8. #8
    JetSkiDaddy's Avatar
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    Dont forget the water injection settings need to be right. Back in the day that was the most common cause of not getting rpms.

  9. #9
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    The installation of a Coffman is pointless if you kept the stock intake...it needs to BREATHE to work, so open it up....F/A's and a rejet...

  10. #10

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    Yes, but did you actually take the stock impeller and remove 1.5 degrees pitch? If you do follow the coffman instructions, and send your stock prop to impros and have them pitch it to 14/18 or 19 it does work as advertized. If you put a 15/20 concord in it, you will never get it to work right with a stock engine. I have done many, and have had a great deal of success. Most people do not follow the prop pitching instructions closely.

    Louis

    www.teammeanracing.com

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