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  #1  
Old 08-12-2013, 07:43 PM
cruiser cruiser is offline
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engine miss

1981 351 with pertronics ignition. Last 3 times out ran great. Went to start it and had a definate miss. Checked the carb. Drivers side 3 1/2 turns out, other side 2 1/2. Have not touched the engine since i bought it this spring. Plugs are old but clean and light brown.. Inside the dist. cap the towers are grooved from the cap not being on right at some point. should the choke plate be 100% open when the engine is warmed up? I noticed the small cotter pin is missing from the linkage than rides on the electric choke. Any suggestions, new plugs and distributor cap tomorrow for sure.
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  #2  
Old 08-12-2013, 08:03 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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Choke should be lightly closed on a cold engine and 100% open after 90 seconds with the key on. The imbalance of the mixture screws could masking a clogged idle passage on one side. With the engine off, remove the mixture screw and put a rag over the top of the carb. Insert the tube from a can of carb cleaner into the mixture screw hole and spray it out. Do this for both sides. Start with the mixture screws at 1 1/2 turns out and see what you get.

The notched dist cap and worn plugs could all add up to your problem. Keep us posted on your results.
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Old 08-12-2013, 08:23 PM
cruiser cruiser is offline
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will do as you suggest. Just found two cracked terminal towers, cracks are on the outside, but im sure they travel to the inside. can't see cracks on the inside but bet their jumping.'
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  #4  
Old 08-12-2013, 08:24 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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Quote:
Originally Posted by cruiser View Post
will do as you suggest. Just found two cracked terminal towers, cracks are on the outside, but im sure they travel to the inside. can't see cracks on the inside but bet their jumping.'
Sounds like you may have found the cause. Might consider changing the cap before doing any carb work, though the carb sounds like it needs some attention.
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S5 WHEEL SALE POLISHED\CLEARCOATED ALUMINUM
TWO 14" @ $149, FOUR 14" @ $259, TWO 15" @ $169 (5 OR 6 LUG)


SNOWMOBILE TRAILER PACKAGE $229
TWO 20X8.50-10 KENDA LOADSTAR LOAD RANGE E TIRES
TWO S5 GUNMETAL W/CHROME LIP ALUMINUM WHEELS

2 LED REPLACEMENT BRAKE LIGHTS $29
SAME LIGHT WORKS ON YOUR SNOWMOBILE TRAILER

HITCH & COUPLER LOCK KEYED ALIKE $39
REBUILDING HOLLEY MARINE 4160 CARBURETORS - $225 DELIVERED
Email - tiresplease@gmail.com
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  #5  
Old 08-12-2013, 08:31 PM
T-Rager T-Rager is offline
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Be sure to check the plug wires as well.
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  #6  
Old 08-12-2013, 09:46 PM
cruiser cruiser is offline
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ok to all replys, the choke butterfly will not open, only about 1/3 .seems to hit a dead stop. Am i missing something?
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  #7  
Old 08-12-2013, 10:14 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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First take note of where the choke is set, then loosen the three screws on the choke cap and try rotating the cap to get more choke blade travel.
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S5 WHEEL SALE POLISHED\CLEARCOATED ALUMINUM
TWO 14" @ $149, FOUR 14" @ $259, TWO 15" @ $169 (5 OR 6 LUG)


SNOWMOBILE TRAILER PACKAGE $229
TWO 20X8.50-10 KENDA LOADSTAR LOAD RANGE E TIRES
TWO S5 GUNMETAL W/CHROME LIP ALUMINUM WHEELS

2 LED REPLACEMENT BRAKE LIGHTS $29
SAME LIGHT WORKS ON YOUR SNOWMOBILE TRAILER

HITCH & COUPLER LOCK KEYED ALIKE $39
REBUILDING HOLLEY MARINE 4160 CARBURETORS - $225 DELIVERED
Email - tiresplease@gmail.com
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  #8  
Old 08-13-2013, 05:03 PM
cruiser cruiser is offline
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Just installed new cap, miss is gone. Trying to adjust carb. Choke plate will not open the choke cam is stopping the plate from opening. Hitting the stop post. ?????
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  #9  
Old 08-13-2013, 05:27 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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I would Google Holley marine 4160 exploded view and compare your linkage. You could post some pics here and we could take a look too.
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Peter
S5 WHEEL SALE POLISHED\CLEARCOATED ALUMINUM
TWO 14" @ $149, FOUR 14" @ $259, TWO 15" @ $169 (5 OR 6 LUG)


SNOWMOBILE TRAILER PACKAGE $229
TWO 20X8.50-10 KENDA LOADSTAR LOAD RANGE E TIRES
TWO S5 GUNMETAL W/CHROME LIP ALUMINUM WHEELS

2 LED REPLACEMENT BRAKE LIGHTS $29
SAME LIGHT WORKS ON YOUR SNOWMOBILE TRAILER

HITCH & COUPLER LOCK KEYED ALIKE $39
REBUILDING HOLLEY MARINE 4160 CARBURETORS - $225 DELIVERED
Email - tiresplease@gmail.com
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  #10  
Old 08-13-2013, 06:19 PM
cruiser cruiser is offline
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just adjusted the carb with a vacuum guage, pretty easy. Running great now. not to sure about the choke. Will take pics and try to post. Thanks for the help.
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