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Thread: Adjusting the Valves on the Predator

  1. #1
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    Adjusting the Valves on the Predator

    alright so heres the deal. the Predator is a DOHC liquid cooled engine that uses shim and buckets to set valve clearances. if your clearances are too tight or too loose your performance will suffer.

    adjusting the valves is NOT as hard as some may think. i will do my best to walk y'all through it. i would also like to thank preddy08, polarisbob, THE_PREDATOR, and the rest of the predatorowners crew for helping me out. also check out preddy08's walkthrough on www.predatorowners.com i am basing my write up on his.


    so first step, clean your quad! make sure areas around the engine are pretty good looking. now, make sure you have a good work area for you quad. next, i would highly reccomend a table to set parts on as you will be removing alot of items.

    next, remove the gas tank, front fenders, and exhaust system. i reccomend using paper bags to place the specific nuts and bolts in so when you put your quad back together, it will be easier to find everything. label these bas as well.
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  2. #2
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    the gas tank has a half inch bolt with washer that holds it to the frame, and all the frame mounts are held with a hex head.




    ok, if you are sitting on the quad, on the left (stator) side of the motor, there will be two timing plugs. the top one is a 6mm hex head and the lower one is a 10mm. remove both of them.


    NOTE= the following view is NOT a good example of what your quad should look like when you do this. make sure she's clean
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  3. #3
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    with the timing plugs removed, you are now going to set you engine at TDC. to do this. take a ratchet with a small extension and a 19mm socket and put that on the lower nut (where the 10mm plug came off of. you will turn that a hair either clockwise or counterclockwise until you see the "T" lined up in the upper area where the 6mm plug came off.
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  4. #4
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    The "T" should line up perfectly with the small notch. heres what you are looking for:
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  5. #5
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    ok, so your motor SHOULD (key word) be at TDC. now you can remove the head bolts. they are 8mm bolts. remove them in a criss cross pattern and set them aside.

    now the top of you head should lift off. there is a gasket around it. remove that as well, but be carefull not to "yank" to hard on it and tear it. set both of those items aside on your work table.
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  6. #6
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    heres what you should be lookin at:
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  7. #7
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    ok, go to the right side of the quad and bend down a bit (that doesnt sound too good, but just stay with me here), lol, you should see small "timing" marks on the cams. on the left cam (intake cam) you should see a mark at 9 oclock and 12 oclock. on the right (exhaust cam) cam you should see a mark one tooth different from the intake.

    heres a picture taken by preddy08 from predatorowners.com:
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  8. #8
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    keep those marks in mind for when you are re-assembling your quad. ok, now you are going to need to get a feeler gauge from around .002" to say .020" a feeler gauge consists of strips of metal that are different thicknesses. they measure the clearances of the valves and are your key to gettin your machine runnin properly.
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  9. #9
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    ideally you want your intake sides to be .006" and your exhaust to be .010" slide the feeler gauge under the lobes of the cams from the inside out. its easier to show you with a picture.

    here i am measuring the clearance of the exhaust side.
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  10. #10
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    intake feeler gauge going in:
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