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  1. #1

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    non-PV 1200 rpm problems

    Started up sis-in-law's '98 XL1200 for first time this year (on the hose) have problem with revs.
    Blip throttle maybe four times and all is fine, but the fifth time tach stays up at 5 or 6K for two to five seconds after let off throttle. Very inconsistent as to when revs on its own and when it doesn't. Checked linkage, all ok. Am I getting air in somewhere below throttle plates; manifold gasket maybe? Was thinking carbs but all three would have to have problems to keep rpm's up so high wouldn't they? How does this happen when sitting idle indoors for winter? Ski was fine when put up last fall.
    Talked with WFO since posting, Rich suggested getting in water first see how it runs under load before troubleshooting. I'll try that and report back.
    Thanks for any help.
    Last edited by toyterrific; 05-27-2011 at 04:43 PM. Reason: additional info


  2. #2
    Old Ski Insanity w/rpm500's Avatar
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    A wild ASZ guess??.. vac. leak Bottom end seal or at a split.. 4 blips, you have used all the residule fuel laying in the crank cases.. then # 5 rolls on and your pulling it lean with a leak...

  3. #3

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    Finally got the ski on the water today, acts totally different under load.
    Idled ok but maxed out, on dash gauges, at 42 mph and 5600-5800 rpms.
    Plugs checked out a little on the black side, but they weren't new.
    Thought I noticed a little smoke wafting from under "hood" & didn't think much of it.
    Pulled ski out of water, opened drain plugs and water poured from both.
    Then took off back seat, pulled storage bin, more smoke.
    Sounds like an exhaust leak now, huh?
    Will search for it in the morning.

  4. #4

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    I'm all over the place with this ski.
    Compression test reveals 103, 107, 107.
    Guess I'll be doing a top end kit, then troubleshoot elsewhere if I still have problems.

  5. #5
    Old Ski Insanity w/rpm500's Avatar
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    that smoke is telling you have a leak in the system.. was the water hot draining out?... find your leak first.. then run it some more before condeming its health via one compression read....

  6. #6

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    Went through carbs over weekend. Found two check valves creased, one needle valve sticking & one high speed screw missing the o-ring. Put in used parts I had from last rebuild. Rough waters, speedo up to 46. Rode my 98 XL1200 back to back with this one. Mine has great holeshot, lot of "torque" if you will. Problem ski does not have low end grunt, it's not cavitation.
    Did take off head as well, wash looked good. Installed new head gasket, will have to check compression tomorrow.
    New plugs, too.
    Maybe swap cdi and plug wires between skis as next step?
    Little water in hull this time, not concerned.

  7. #7

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    Compression 105, 105, 107.
    Will post pic's of old plugs tomorrow.

  8. #8

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    Click image for larger version. 

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    piston wash and a crappy plug pic if it helps

  9. #9
    Yamaha artisan Cutlass's Avatar
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    I'm surprised to see the pistons say 64x on them and not 65U

  10. #10

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    Didn't even notice that.
    64x pistons are for 760's. Guess there's no difference. I wonder how many "different" pistons are actually interchangeable.

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