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  1. #1
    btldigger's Avatar
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    Btldigger's 650sx Project

    I picked up this one several months ago. My gf's son saw the stand ups run at nashville and thought it looked like fun. So I bought this on impulse $375 with a single trailer that is big enough for a 3 seater. It started rite up and ran but that is about all I can say for it. The compression was 125/140 so it needs a top end. The impeller looks like it spent some time in a gravel pit. The zebra stripes were covering up plenty of nicks and scapes and the bottom looks as if it was drug down the road without a trailer. So today after doing some cleanup getting ready to finish the ultra I tore into the 650. Got rid of the zebra look and tore into the motor. Found out why that comp was down.... ouch. Oh well its going to get a paint job and a engine rebuild. Might just have to make it a twin to my ultra Guess somewhere along the way I will have to learn to ride a stand up, I havent been on one in 20 years
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  2. #2
    btldigger's Avatar
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    Here is the engine carnage
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  3. #3
    axgrider73's Avatar
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    What caused the engine damage? Water?

  4. #4
    btldigger's Avatar
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    Doesnt look that way. It looks like bits of something were flying arround in that mag cyl. I will know more when it gets torn compleatly down. At least the cyl walls look good, no damage.

  5. #5

  6. #6
    looks to me they had it running to lean or may be stuffed reed valve

  7. #7
    cigarlust's Avatar
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    Man those 650's will run and run... Group K has a great article about making a retro throw back... Find a pipe and a 44 Mikuni with an intake manifold for cheap and start having some fun.

    650's have really, really, really low piston speeds so the cranks last forever, even with a pipe.

    For an intake grate call John Zigler at RCJS, he makes his own it's like 50 bucks, search the boards, he is a cool guy and probably has some a/f parts that will help your ski and he's very reasonable. His intake grate is a dual scoop design, you don't want to run an aggessive grate on the 650's because they will rip the hull inserts clean out! I was very pleased with the intake grate. What size carb is on there? If it's a 28mm get rid of it! You can get a 38mm from the later years on ebay with an intake for less than a hundred.

  8. #8
    cigarlust's Avatar
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    http://www.pwctoday.com/f72/turn-you...-a-157734.html

    Check this thread out I found it pretty good. On the X2 side they recommend buying a 1/4 12" drill bit and poking 4 or 5 extra holes in the stock waterbox baffles, it depends on what year your box is... I can tell it flows better, it's only slightly louder, way, way more quiet than an a/f exhaust... I kinda think stand ups are like crotch rockets, they need loud exhausts, with your paint scheme you should stand out.
    I hate to say pwctoday has alot more old school stand up info, but the guys on XH20 are a little more mature... You can find some old timers that will help you out though.

    If you want to drop a bit of cash, look at group k's website, very informative...

    You for sure want an a/f extended ride plate if any one over 150 is going to ride, they like to bounce. The new superjet's and SXR's are like comparing a blown 4 stroke to a two stroke if you were to ask about the differences. Bottom line, I wouldn't sink a bunch of money into the ski, they seem to last forever, but you'll end up wanting more brap.

  9. #9
    cigarlust's Avatar
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    On closer inspection... I think it's fragments from the metal reeds they used to use... on the older craft.

  10. #10
    DETONNATION!!!!!!!!!! bitch got hot and started popping on him

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