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cobra131

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Reply with quote  #1 
While turning over the motor by hand the valve bucket under the decompression valve is making a loud popping sound I can see the the lobes push the buckets down then after that you can see the bucket pop up making that sound I just had the head rebuilt I had someone do bottom end work for me he checked the whole motor and no this makes this noise please help
joshr08

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Reply with quote  #2 
I am guessing you had the same thing happen when I rebuilt my motor a few yrs ago.  It only makes the sound when turning over by hand or at very low idle.  It is the de-comp unit on the ext. cam.  Once the motor is spinning over 1250-1300 RPM's it wont make the sound.  I actually tore my motor back down and made a video with the cam when mine happened.  I'm sure if you look long enough on the site you will find my old post.

Sorry for the slow reply.  I don't check the site much but have just been getting the old predasaki back in shape.  I will be taking it to the 1/4 mile asphalt drags this weekend.  Might as well use my motor that I built before putting my 06 ZX6R on the 1/4 mile next yr.


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04 Predator 558 Flat Tracker(Predasaki)
04 Predator Trail quad in the making
Project Reaper Build
cobra131

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Reply with quote  #3 
I will check to see if I can find it I took the decompression valve off to see if it would make the same noise it didn’t good luck at the drags
joshr08

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Reply with quote  #4 
Ran 10.46 @ 60.14 in the 1/8th mile.  Couldnt keep the front end on the ground.  I am in to process of building a wheelie bar for it.  I figure that will get me to low 10's or super high 9's.  
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04 Predator 558 Flat Tracker(Predasaki)
04 Predator Trail quad in the making
Project Reaper Build
cobra131

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Reply with quote  #5 
I would like to see your preddy with the bars I bet it is really neat 👍🏻
joshr08

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Reply with quote  #6 
Here you go.  Quad is ready for next test an tune.  Now working on getting my ZX6R ready to go as well.  Should be a good time.  


64827313_707612149681644_1292990605856604160_n.jpg  66097159_707612186348307_8556308146283347968_n.jpg 



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04 Predator 558 Flat Tracker(Predasaki)
04 Predator Trail quad in the making
Project Reaper Build
cobra131

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Posts: 432
Reply with quote  #7 
That is wicked nice 👍🏻👍🏻
joshr08

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Reply with quote  #8 
Thanks.  Sorry for the slow reply.  Been super busy with work and family life.  Still haven't made it back to the track for a TNT.  I have the ZX6R finished and listed for sale since I don't have time to ride.  
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04 Predator 558 Flat Tracker(Predasaki)
04 Predator Trail quad in the making
Project Reaper Build
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