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Old 07-23-2015, 10:30 AM
Janks19 Janks19 is offline
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Join Date: Jul 2015
Boat: 1977 mastercraft
Location: midwest
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Engine seems to be missing on accel

Alright team I am new here, I need some advice. I recently refurbished a 1977 Stars and Stripes and after about a month of running good the engine seems to miss a few cyclinders when I accelerate above 1000 rpm or so. The timing is good as is the dwell. During the rebuild I took the heads off to get reworked and had the carb rebuilt. Any ideas as to why I am having this issue would the appreciated.

Mike
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Old 07-23-2015, 12:55 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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Boat: 1977 Stars & Stripes
Location: St. Paul, MN
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Welcome to Team Talk. Always great to see another '77 around here.

Starting with the basics, Dist cap & rotor, plugs, wires all need to be serviceable. Great to hear you use a dwell meter to set your points. I would double check dwell and timing.

Check you coil voltage with key on/ engine off and with engine running. Should be seeing battery voltage, less ballast resistor.

Most likely causes of misfiring under load are bad cap & rotor allowing arcing to ground or bad plug or coil wire(s).
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REBUILDING HOLLEY MARINE CARBS - $289 DELIVERED
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Old 07-23-2015, 01:54 PM
Janks19 Janks19 is offline
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Thank you I will give those ideas a shot
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Old 07-23-2015, 04:14 PM
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gr82bgreen gr82bgreen is offline
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Quote:
Originally Posted by thatsmrmastercraft View Post
Welcome to Team Talk. Always great to see another '77 around here.

Starting with the basics, Dist cap & rotor, plugs, wires all need to be serviceable. Great to hear you use a dwell meter to set your points. I would double check dwell and timing.

Check you coil voltage with key on/ engine off and with engine running. Should be seeing battery voltage, less ballast resistor.

Most likely causes of misfiring under load are bad cap & rotor allowing arcing to ground or bad plug or coil wire(s).
Could be coil as well. Not a bad idea to change a 38 year old coil.
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  #5  
Old 07-23-2015, 04:31 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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Join Date: Sep 2008
Boat: 1977 Stars & Stripes
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Quote:
Originally Posted by gr82bgreen View Post
Could be coil as well. Not a bad idea to change a 38 year old coil.
Oh yeah. No one ever regretted the money spent on that.
__________________
CUSTOM WHEEL & TIRE PACKAGES

$125 LED LIGHT PACKAGE - FREE SHIPPING
REBUILDING HOLLEY MARINE CARBS - $289 DELIVERED
REBUILT COMPLETE MARINE HOLLEY 4160 CARBS
FOR 302, 351 & 454 STARTING AT $425 DELIVERED
Email - [email protected]
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