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10-13-2020, 07:40 PM | #1 |
Not Yet Wild
Join Date: Sep 2020
Posts: 11
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workhorse st350 coil incoming voltage
Hey guys. New to this site because I just acquired a workhorse st350. The MFG code is A203. It is a fixer upper. I just put a new crankcase gasket on it because it was leaking terrible. It is a non MCI engine. It's running badly so I tested the coil and it checked out good as did the pulser coil. My question is... what voltage should be coming to the coil form the red and white wires as the engine is cranking? I removed those wires from the coil an put an ohmmeter on them and it is receiving only 3.5 to 4.0 volts as I crank the engine. I was thinking that should probably be 12ish. So could my igniter be bad? I appreciate all your replies. This site has saved me lots of time and money so far.
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10-13-2020, 07:55 PM | #2 |
Test before replacing
Join Date: Aug 2013
Location: Ohio side of the Pennsylvania border.
Posts: 3,496
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Re: workhorse st350 coil incoming voltage
Have you adjusted the valves? It runs, but poorly.
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10-13-2020, 08:08 PM | #3 |
Not Yet Wild
Join Date: Sep 2020
Posts: 11
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Re: workhorse st350 coil incoming voltage
I did adjust the valves. checked compression at both cylinders and they were around 150-155. Prior to the valve adjustment one of the cylinders was at 90 compression.
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10-13-2020, 08:40 PM | #4 |
Vintage tech
Join Date: Sep 2009
Location: South
Posts: 3,216
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Re: workhorse st350 coil incoming voltage
Post number 2
https://www.buggiesgonewild.com/showthread.php?t=166477 There are other tests you can do. Remove the valve cover also and take a picture . I just want to see if the intake valves are sinking in head. Common on these engines. Yours still got the OEM carburetor ? Have you cleaned it ? |
10-14-2020, 03:28 PM | #5 |
Not Yet Wild
Join Date: Sep 2020
Posts: 11
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Re: workhorse st350 coil incoming voltage
It does still have the OEM carb. I will send pics of valves later this evening when I get home. Thanks for your help
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10-14-2020, 04:54 PM | #6 |
Not Yet Wild
Join Date: Sep 2020
Posts: 11
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Re: workhorse st350 coil incoming voltage
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10-14-2020, 05:39 PM | #7 |
Not Yet Wild
Join Date: Sep 2020
Posts: 11
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Re: workhorse st350 coil incoming voltage
Is this the igniter?1602715054099123727094570869486.jpg
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10-14-2020, 06:02 PM | #8 | |
Vintage tech
Join Date: Sep 2009
Location: South
Posts: 3,216
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Re: workhorse st350 coil incoming voltage
Quote:
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10-14-2020, 06:43 PM | #9 |
Not Yet Wild
Join Date: Sep 2020
Posts: 11
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Re: workhorse st350 coil incoming voltage
It seems to only run with the choke half out and about half throttle. Whenever you push it to the floor it falls on its face. Where exactly is the igniter?
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10-14-2020, 06:54 PM | #10 | |
Vintage tech
Join Date: Sep 2009
Location: South
Posts: 3,216
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Re: workhorse st350 coil incoming voltage
Quote:
If its running there is nothing wrong with your ignitor. |
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