workhorse st350 coil incoming voltage

antknee3636 · 10-13-2020, 07:40 PM

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.

cart around · 10-13-2020, 07:55 PM

Have you adjusted the valves? It runs, but poorly.

antknee3636 · 10-13-2020, 08:08 PM

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.

trig123 · 10-13-2020, 08:40 PM

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 ?

antknee3636 · 10-14-2020, 03:28 PM

It does still have the OEM carb. I will send pics of valves later this evening when I get home. Thanks for your help

antknee3636 · 10-14-2020, 04:54 PM

16027121863546416268400246749470.jpg

16027122386846660595659803570121.jpg

antknee3636 · 10-14-2020, 05:39 PM

Is this the igniter?1602715054099123727094570869486.jpg

trig123 · 10-14-2020, 06:02 PM

Quote:

Originally Posted by antknee3636

Is this the igniter?Attachment 210144

No thats the voltage regulator. Looks like the ignitor is missing but I can't tell for sure with just that one picture. Your valves look great and are not pulled in head.

antknee3636 · 10-14-2020, 06:43 PM

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?

trig123 · 10-14-2020, 06:54 PM

Quote:

Originally Posted by antknee3636

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?

Ignitor is bolted next to voltage regulator on same metal bracket.
If its running there is nothing wrong with your ignitor.

10-13-2020, 07:40 PM	#1
antknee3636 Not Yet Wild Join Date: Sep 2020 Posts: 11	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.
antknee3636 Not Yet Wild Join Date: Sep 2020 Posts: 11

10-13-2020, 07:55 PM	#2
cart around Test before replacing Join Date: Aug 2013 Location: Ohio side of the Pennsylvania border. Posts: 3,495	Re: workhorse st350 coil incoming voltage Have you adjusted the valves? It runs, but poorly.

10-13-2020, 08:08 PM	#3
antknee3636 Not Yet Wild Join Date: Sep 2020 Posts: 11	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.
antknee3636 Not Yet Wild Join Date: Sep 2020 Posts: 11

10-13-2020, 08:40 PM	#4
trig123 Vintage tech Join Date: Sep 2009 Location: South Posts: 3,215	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
antknee3636 Not Yet Wild Join Date: Sep 2020 Posts: 11	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
antknee3636 Not Yet Wild Join Date: Sep 2020 Posts: 11

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10-14-2020, 04:54 PM	#6
antknee3636 Not Yet Wild Join Date: Sep 2020 Posts: 11	Re: workhorse st350 coil incoming voltage 16027121863546416268400246749470.jpg 16027122386846660595659803570121.jpg
antknee3636 Not Yet Wild Join Date: Sep 2020 Posts: 11

10-14-2020, 05:39 PM	#7
antknee3636 Not Yet Wild Join Date: Sep 2020 Posts: 11	Re: workhorse st350 coil incoming voltage Is this the igniter?1602715054099123727094570869486.jpg
antknee3636 Not Yet Wild Join Date: Sep 2020 Posts: 11

10-14-2020, 06:43 PM	#9
antknee3636 Not Yet Wild Join Date: Sep 2020 Posts: 11	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?
antknee3636 Not Yet Wild Join Date: Sep 2020 Posts: 11

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