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  1. #1
    Pockett.Rockett's Avatar
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    WR500F NooB questions

    I'm new to PWC's and have recently aquired a 89 WR500F.

    Can I squeeze extra power out of it with a 650 carbi?
    It has just been rebuilt with 25 thou OS pistons and also has a solas prop.

    I want to get rid of the stock bilge pump and fit an electric. I've been told to set it up without a float switch and to just leave it on whilst the engine is running.

    Will the generator handle the extra electrical load of the pump and does anyone have an opinion on where it should go? (Engine bay or either side of rear underseat compartment).

    Is there anything I should modify/add for use in the surf?


  2. #2
    Old Ski Insanity w/rpm500's Avatar
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    does the aussie version have a drain? otherwise add one to the rear (early u.s. didnt) ..ok first of all ,if its a rolling surf it will be fine otherwise a wr hull is flat and will pound you big time (no v per say)

    the venturi drain works fine ( you can add the pump if you wish ,id add a switch on your throttle and cam it on at higher rpm with the carb lever) .. engine bay as it would sit there at a low point (and you have room ) get a gel cell as it can take the load... charging system should handle the load as thats all the wr has is charging (no gauges)

    that said mill the head .030 ,add the 650 carb( jetting, on a 650 with the mill ,may be close ),get yourself the jet dynamics grate to load the pump in the rough..
    your stock f/a is fine to use as it has better roll over surf protection

    you could look for a pipe but they are hard to find now.. shim your plate about 1/2 inch down to help drive the nose down...(get the longest you can find...

    boar out your nozzel for more bottom end (will kill the top a tad,but if surf is where you ride, youll need that more,0

    a tdr waterbox could help.. at least top end..(ebay buy)
    a ss impeller will help to keep the cavitation down... (you will burn the backside of the aluminum,it just happens on a wr)

  3. #3
    Pockett.Rockett's Avatar
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    Sweeet.
    I added an extra drain on portside last week as there was heaps of sand and water collecting down there.
    What is f/a?
    Prop is S/S. and I've sorta ported the rear housing...It had a nice layer of oxidization so I cleaned it with acid and sanded(and polished) it smooth.
    Should I shim the cav plate evenly?

  4. #4
    Old Ski Insanity w/rpm500's Avatar
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    f /a is the flame arrestor on the carb.. the wr has a shell over it to help keep water out especialy in roll over...
    the polish may slow you as it created more surface tension ..rough it up with 80 grit..
    (from memory on qtys*) install 6-8* .051 thous washers on rear bolts,3 on the next set up, and zip on the fronts (you will need longer bolts at the rear and center accordingly ...install the front then the next and then the rear last(you can gauge the ammounts you will need as the angle developes.... the plate may set a touch higher in front than the grate end, which is fine... check the sealing foams at the pump housing sides to body and silicone the grate in,at the front and rear, to help lessen cavitation...

  5. #5
    Pockett.Rockett's Avatar
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    Smile Gasket kit problem

    Quote Originally Posted by w/rpm500 View Post
    install 6-8* .051 thous washers on rear bolts,3 on the next set up, and zip on the fronts (you will need longer bolts at the rear and center accordingly ..
    Cheers!
    Thanks for the advice.

    Are all the WR500's the same as far as head gasket kits go?

    Do you have any online pix of your W series beasts?

  6. #6
    Old Ski Insanity w/rpm500's Avatar
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    yes the gasket kits are all the same as far as the use of components ..the yamaha gaskets were at one time made of asbestos .. since then the new ones are made of other materials and yami's have a metal shield installed on the big plate gasket at the exhaust/muffler mount, for burn proof capabilitys.. ( it takes some time to burn one thru anyway,so any gasket set makers will work for a good many years)

    the bit about the .051 thous is for your plate washer shiming question

    pictures soon to be posted as I have a camera that works now!!

  7. #7
    john zigler's Avatar
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    the yamaha 500 motors came with a 38mm mikuni carb. the 650, had a 44mm carb. these will not intercange. the mounting bolt spacing is different.

    same with the flame arrestor mounting, the 38mm has 3-bolts, and the 44 has 4, so even "if" you did some how adapt a 44mm carb, you could NOT reuse your original f/a.

  8. #8
    Old Ski Insanity w/rpm500's Avatar
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    john is right ,i'm thinking of the interchange between the later sbn 500 carb(square pump diaf) and not the early sb round body ...try to find the square body, its a better carb,same flange spread and if i remember correctly the venturi is bigger (ottomh:round body measures at the venturi 'choke' at 28 mm ...the square at 32mm, i will check and measure tonight to be accurate)

  9. #9
    Pockett.Rockett's Avatar
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    Quote Originally Posted by w/rpm500 View Post
    the bit about the .051 thous is for your plate washer shiming question
    I didn't realize it at first but my cav plate is a pissy homemade job. A previous owner has smashed the orig plate and replaced it with a piece of plate alloy. The trailing edge had a neat curve in it and -not knowing any better- I figured it was stock. After checking Yamaha's exploded diagrams I realized what it should look like.
    The plate is approx 8mm(shizen..umm..5/16") so there is a mega step between it and the bottom of the hull. I've got some rectangular aluminum bar lying around somewhere that might pack it out and bring it back to a more respectable level before shimming it out with the 51 thou washers.
    I'll have a crack at it tomorrow if I get a chance.

    Carbi is a blow, but $#!t evidently, does happen.

  10. #10
    Old Ski Insanity w/rpm500's Avatar
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    there was an alloy sheet plate sold for years..does your have a few angle cut outs on center,at the rear ? and or have 2 fins or 2 small holes along the length of it where they use to be ?

    there's usually one or two 'o/e', on the u/s ebay all the time ... check your aussie ebay... im sure they show up every now and then too...

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