616 stumbling
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Garden Tractors
Forum Description: A great place to discuss the Simplicity and Allis Chalmers Garden Models
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=125229
Printed Date: 30 Oct 2025 at 8:24pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 616 stumbling
Posted By: coggonobrien
Subject: 616 stumbling
Date Posted: 30 Jun 2016 at 6:57am
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just looking for suggestions, above 1/2 throttle the 616 starts missing. I've replaced the fuel filter, fuel lines, fuel pump (bypassed the mechanical and installed an electric), new carb I had alrady, new plugs, new plug wires. I need to run a volt test on the coil just to make sure 12v in 12v out. Only thing left to do is adjust timing and potentially replace the ignition box components. Any thoughts? Motor is not running rich.
Thanks David
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Replies:
Posted By: Tracy Martin TN
Date Posted: 30 Jun 2016 at 8:46am
I would spray Seafoam in it while it is running first. Might be carb adjustment, might be a little carbon buildup. If not, the points will probably be the culprit. Be safe and don't burn your hands. Tracy
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No greater gift than healthy grandkids!
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Posted By: DSeries4
Date Posted: 30 Jun 2016 at 9:15am
Check for a bad spark plug. I put new ones in my 620 a few years ago and it would do what you describe at higher throttle. No problem at low throttle. Turns out one of the new plugs was bad. Replaced it and has run perfect since.
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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '63 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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Posted By: coggonobrien
Date Posted: 30 Jun 2016 at 9:17am
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i've had 2 sets of new plugs in it
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Posted By: DSeries4
Date Posted: 30 Jun 2016 at 9:27am
What kind? Autolites are the ones that went bad in mine. I switched to NGK. I could tell the plug was no good because it was not as hot as the other one after running the engine.
That has been my only experience. Good luck in tracking down the problem.
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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '63 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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Posted By: tadams(OH)
Date Posted: 30 Jun 2016 at 3:09pm
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Is your battery fully charged?
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Posted By: coggonobrien
Date Posted: 30 Jun 2016 at 3:28pm
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battery is charged and for grins and giggles i put the battery charger on it while running, 40amp mode
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Posted By: coggonobrien
Date Posted: 30 Jun 2016 at 3:28pm
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ngk plugs, won't touch autolite or champions
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