Bad tach causing a miss on an hp500 Carb engine
#1
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Bad tach causing a miss on an hp500 Carb engine
I have a sporadic miss around 2500 rpm on my hp500 carb engine. When the engine misses I also notice that the voltage guage draws down with the miss I remember reading somewhere that a bad tachometer could be the culprit causing this miss. Does anyone have any experience with this issue in which this was the cause?
#3
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It happened to me. It took me a year to diagnose it because it was so intermittent. Finally engine acted up long enough to figure it out. Cut the tach wire and engine ran fine. Replaced tach, and I was back in business.
#9
Yep, buddy or mine (BadDog) has an HP500 clone in his boat, and had that very same issue. To this day, he is still running without a tach. Says he knows by sound and speed about where his RPM's are.
#10
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More info needed engine serial # why because do you have the overspeed assembly in your ignition set up ? Later HP 500 carbs apps did not have it. Older Hp 500 had them as they can be a problem child.
next ignition sensor under the distributor cap and rotor can be your problem. While you are in there, I would replace the cap and rotor if not already new and how old is the ignition coil - if 5 years or older I would change that to. They are maintenance items anyways
also make sure all connections are tight and clean form coil to tach and also all grounds especially back side engine grounds to.
next ignition sensor under the distributor cap and rotor can be your problem. While you are in there, I would replace the cap and rotor if not already new and how old is the ignition coil - if 5 years or older I would change that to. They are maintenance items anyways
also make sure all connections are tight and clean form coil to tach and also all grounds especially back side engine grounds to.
Last edited by BUP; 10-02-2015 at 10:13 PM.