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  1. Thread: SLX780

    by Myself
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    12
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    185

    I've seen several CDIs crap the timing circuit....

    I've seen several CDIs crap the timing circuit. They were all oem units. It's something that happens I reckon.
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    The engine is basically the same as...

    The engine is basically the same as this....https://youtu.be/dL3My_Iw8Wc
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    Pistons will come with new wrist pins, I use WSM....

    Pistons will come with new wrist pins, I use WSM. Rods are probably fine. If the bolts are TTY/stretch then there will be a measurement in the manual. I believe there was when I did mine and they...
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    Yes, change pistons. You don't want that circlip...

    Yes, change pistons. You don't want that circlip design in your engine. In case your not familiar with the Yamaha 4stroke bearings, they have a number/color system. The numbers are stamped on the...
  5. Thread: SLX780

    by Myself
    Replies
    12
    Views
    185

    As xlint89 pointed out, most common reason to fry...

    As xlint89 pointed out, most common reason to fry electrical is the missing plastic battery cover. The positive battery post shorts out on the electrical box which is aluminum AND the ground for the...
  6. Thread: SLX780

    by Myself
    Replies
    12
    Views
    185

    A low ohm pulser coil on the Fuji triples will...

    A low ohm pulser coil on the Fuji triples will cause a bogging, half rpm, or even a rev limiter like symptom.

    I have written down probably everything you need to know...
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    The electrical systems on those are sh!t. Most...

    The electrical systems on those are sh!t. Most common things are corroded pins inside the wiring connectors, especially the red wires. Bad orange key switch contacts. And bad trim motor, and module...
  8. The campgrounds are closed in northern Arkansas...

    The campgrounds are closed in northern Arkansas but the ramps are still open and they've waived fishing licenses too. Anybody can fish. I'm still getting calls and have had 5 skis brought in for...
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    The scoring doesn't look very bad. Check with a...

    The scoring doesn't look very bad. Check with a machine shop. Have them hone and measure the cylinders, might be able to stay with std size. Also show them the crank. Check with SBT, I think you can...
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    1...no, mine was original oem and was black. ...

    1...no, mine was original oem and was black.

    2...looks like SBT pistons and circlips. I don't know of any other brand that uses those failure prone c-clips.

    3...To use oversize pistons the...
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    508

    Ya, I'm still thinking it sounds like a loose...

    Ya, I'm still thinking it sounds like a loose valve tick.
  12. The midshaft is a short shaft with a female...

    The midshaft is a short shaft with a female splined end that the driveshaft slips into. It commonly gets frozen together there. I've had good luck squirting penetrating lube up around where the...
  13. Look at it and verify yourself for sure. ALL of...

    Look at it and verify yourself for sure. ALL of these carbs have fuel inlet lower on the carb body......closest to the engine. Fuel outlet/return higher on the carb body.....closer to the airbox.
    ...
  14. Thread: Opinion needed

    by Myself
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    310

    How much is it? If it's 2k then go for it. If...

    How much is it? If it's 2k then go for it. If it's $3500 then NO.
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    For some reason the FXHO 160hp have a tendency of...

    For some reason the FXHO 160hp have a tendency of spitting a rod. Yes, it will come out with the exhaust manifold in place. I pieced one together and got it running last year. Still have to find an...
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    Well, the engine is the same and sits on the same...

    Well, the engine is the same and sits on the same mount pattern so as far as a conversion goes......it would be relatively easy.
  17. WHOOPS!! Just reread this. Your comment...

    WHOOPS!! Just reread this.
    Your comment #4.............Lines are backwards.
    Fuel comes in at rear carb with acc pump and exits at the front carb.




    Come on guys! We're snoozing! We're better...
  18. Replies
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    508

    Put the cover back on. Start it up and hold a...

    Put the cover back on. Start it up and hold a dowel rod or piece of PVC pipe to your ear. Touch the pipe to the engine in various places to see where it's the loudest.
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    Tall part of the cam lobe up/away from the valve...

    Tall part of the cam lobe up/away from the valve bucket. Then slide a feeler gauge in. Spark plugs out, you can use a strap wrench on the drive coupler to turn it over or maybe bump it with the...
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    The louder growling metal grinding type noise is...

    The louder growling metal grinding type noise is the rear output on the engine......that's just the way they sound. The ticking sounds too loud to be an injector. Sounds like a valve lash adjustment....
  21. While the carbs were apart did you verify the...

    While the carbs were apart did you verify the returns were NOT blocked? I've seen them so bad corroded before that I had to heat the fitings and pull them out of the aluminum to redrill the blocked...
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    Do as K447 says........he literally wrote the...

    Do as K447 says........he literally wrote the book on this stuff!

    I had a Ficht injected Virage do something very similar. The fuel filter was plugged up and causing low fuel volume. Does it start...
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    Watching this....

    Watching this....
  24. Thread: Tired SUV

    by Myself
    Replies
    5
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    199

    Well, that's a 65u engine which is pretty...

    Well, that's a 65u engine which is pretty reliable. For most of the older 2-stroke machines 200-250 hours and they're ready for a top end. You will need to bore the cylinders and go with new oversize...
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    My thought is that if they had no key then it was...

    My thought is that if they had no key then it was not tested and therefore unknown condition.
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