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Discussion Starter · #1 ·
A few month ago, I was able to go up to 7000 rpm. Now when I get to 6300 rpm it dies like I'm hitting the Rev limiter.
I have no ignition box and Comp hydraulic lifter. I adjusted the rocker arms to 1/4 turn and still no improvement.
 

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either that or the mixture is a little fat. Now that the weather is warmer, the fat mixture is even fatter...making the problem worse. I deal with this every year at this time with ATVs (specifically the new 450cc sport ATVs...VERY sensitive carbs)

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<font size=-1>[ This Message was edited by: mavman on 6/23/06 10:58am ]</font>
 

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try changing your plugs.
i had a cougar that used to eat plugs every few weeks would go from 6500 to 5000 change plugs it would be fine fore a while.
turned out to be the coil i changed that and it was fine

<font size=-1>[ This Message was edited by: 68sportcoup on 6/23/06 11:09pm ]</font>
 

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Sounds like valve float, but could be ignition. Need to check both. Hyd cams aren't the best over 6500.
 

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I had a similar proplem. Turned out several of the lifters had started to fail. Changed them and away I go!
 

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7k on a hydraulic is a no-no, they run a very soft spring pressure, that pressure will deteriorate quickly
 

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Discussion Starter · #9 ·
How do I know if the lifters are failing? I notes that they are hard all the time even when the engine has sat for a few days. before the pressure use to dissipate and the lifters will had the soft cushioning from the internal spring.
 
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