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Not sure on how to contact the group, haven’t tried since it went to “IO?” or something like that.

Have a LGT145, 73-74 with a K321AS engine.? I thought perhaps the coil was going bad after 45+ years and purchased one via Ebay that was? supposed to fit.

When installed, the engine backfires thru the intake and exhaust, seem randomly.? Suspect the coil is for a newer K321 but not a vintage on like mine.? In conversations with the seller who is working with me, we measured the ohm resistance of the primary and the secondary and they are not the same as the original Jacobson/ford coil.? Is it possible I need an additional resistance block? Or just a different coil?

Thanks

brian
 

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Coils don't change timing.

Failed condensers often don't stop an engine from running, but the points will wear quickly. ?Points wear changes timing, but doesn't necessarily make it inconsistent.

I would start with timing and points. ?If your coil is too hot and needs an external resistor, it may damage the wires feeding it, but the engine will run great on that very high energy spark.

My LGT145 is of similar vintage. ?The coil did fail. ?Symptom was won't run, no spark. ?I bought a generic 12V coil at auto parts store and it was resolved. ?I think I've replaced points twice because of engine wear wearing on them crooked, and oil contamination.

Regards,
Michael?

On Sep 19, 2023, at 9:53 PM, B. Graedel <brikathy@...> wrote:

?

Not sure on how to contact the group, haven’t tried since it went to “IO?” or something like that.

Have a LGT145, 73-74 with a K321AS engine.? I thought perhaps the coil was going bad after 45+ years and purchased one via Ebay that was? supposed to fit.

When installed, the engine backfires thru the intake and exhaust, seem randomly.? Suspect the coil is for a newer K321 but not a vintage on like mine.? In conversations with the seller who is working with me, we measured the ohm resistance of the primary and the secondary and they are not the same as the original Jacobson/ford coil.? Is it possible I need an additional resistance block? Or just a different coil?

Thanks

brian
 

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Hi Michael,

The goofy thing is, when I re-install the original coil, the engine runs moderately well as it did before I decided to just upgrade the coil with a newer one to eliminate any hidden problems with using the old one.? The vendor has sent a 2nd coil for me to try which I will do in the next couple of days – but I true fully don’t expect any different results form the 2nd new coil because the primary resistance and secondary resistance are the same, both of which are much lower than the Kohler/Jacobson/ford coil.

?

The symptoms I was experiencing originally was little sensitivity in carb adjustments, and having to have partial choke for operating speed and a different choke setting for idle.? Lowest ide rpm I could reliably get was about 1175+.? Also had an intermittent miss - completely random.? I installed new points, condenser, plug, lapped the valve and seats, new head gasket, and replaced the China (big mistake) carb with one from “I save tractors.? The coil I ordered did not come right away, so I assembled all and fired it up, adjusted carb and so on.? The new carb solved the idle and run with choke problem, rpm’s were more controllable, and it now idles at about 1050 rpm.? The random miss is still there, but a lot less often.

?

When the new (1st) coil arrived, I installed it and it backfired (not simultaneously) thru the exhaust and intake very often.? I reinstalled the original coil and the backfire problem went away, but still had an occasional random miss.

So here we are

b

?

From: [email protected] <[email protected]> On Behalf Of mso clr via groups.io
Sent: Wednesday, September 20, 2023 8:37 AM
To: [email protected]
Subject: Re: [JacobsenFordGardenTractors] coil

?

Coils don't change timing.

?

Failed condensers often don't stop an engine from running, but the points will wear quickly. ?Points wear changes timing, but doesn't necessarily make it inconsistent.

?

I would start with timing and points. ?If your coil is too hot and needs an external resistor, it may damage the wires feeding it, but the engine will run great on that very high energy spark.

?

My LGT145 is of similar vintage. ?The coil did fail. ?Symptom was won't run, no spark. ?I bought a generic 12V coil at auto parts store and it was resolved. ?I think I've replaced points twice because of engine wear wearing on them crooked, and oil contamination.

?

Regards,

Michael?



On Sep 19, 2023, at 9:53 PM, B. Graedel <brikathy@...> wrote:

?

Not sure on how to contact the group, haven’t tried since it went to “IO?” or something like that.

Have a LGT145, 73-74 with a K321AS engine.? I thought perhaps the coil was going bad after 45+ years and purchased one via Ebay that was? supposed to fit.

When installed, the engine backfires thru the intake and exhaust, seem randomly.? Suspect the coil is for a newer K321 but not a vintage on like mine.? In conversations with the seller who is working with me, we measured the ohm resistance of the primary and the secondary and they are not the same as the original Jacobson/ford coil.? Is it possible I need an additional resistance block? Or just a different coil?

Thanks

brian
 

开云体育

Interesting. ?Out of box failures on coils are not uncommon. ?I'd be interested to hear the resistance numbers, but more interested to hear if the new coil resolves the issue. ?It may need a ballast resistor.

Don't fear that timing light. ?Intermittent spark is not the same as erratic timing. ?You don't need to actually check the timing. ?Just look at the strobe against a spinning part and listen to the rpm. ?The should move together without the spinning part jumping around erratically.

Your ignition needs to provide sufficient spark on time AND in time.

Regards,
Michael

On Sep 20, 2023, at 11:45 AM, B. Graedel <brikathy@...> wrote:

?

Hi Michael,

The goofy thing is, when I re-install the original coil, the engine runs moderately well as it did before I decided to just upgrade the coil with a newer one to eliminate any hidden problems with using the old one.? The vendor has sent a 2nd coil for me to try which I will do in the next couple of days – but I true fully don’t expect any different results form the 2nd new coil because the primary resistance and secondary resistance are the same, both of which are much lower than the Kohler/Jacobson/ford coil.

?

The symptoms I was experiencing originally was little sensitivity in carb adjustments, and having to have partial choke for operating speed and a different choke setting for idle.? Lowest ide rpm I could reliably get was about 1175+.? Also had an intermittent miss - completely random.? I installed new points, condenser, plug, lapped the valve and seats, new head gasket, and replaced the China (big mistake) carb with one from “I save tractors.? The coil I ordered did not come right away, so I assembled all and fired it up, adjusted carb and so on.? The new carb solved the idle and run with choke problem, rpm’s were more controllable, and it now idles at about 1050 rpm.? The random miss is still there, but a lot less often.

?

When the new (1st) coil arrived, I installed it and it backfired (not simultaneously) thru the exhaust and intake very often.? I reinstalled the original coil and the backfire problem went away, but still had an occasional random miss.

So here we are

b

?

From: [email protected] <[email protected]> On Behalf Of mso clr via groups.io
Sent: Wednesday, September 20, 2023 8:37 AM
To: [email protected]
Subject: Re: [JacobsenFordGardenTractors] coil

?

Coils don't change timing.

?

Failed condensers often don't stop an engine from running, but the points will wear quickly. ?Points wear changes timing, but doesn't necessarily make it inconsistent.

?

I would start with timing and points. ?If your coil is too hot and needs an external resistor, it may damage the wires feeding it, but the engine will run great on that very high energy spark.

?

My LGT145 is of similar vintage. ?The coil did fail. ?Symptom was won't run, no spark. ?I bought a generic 12V coil at auto parts store and it was resolved. ?I think I've replaced points twice because of engine wear wearing on them crooked, and oil contamination.

?

Regards,

Michael?



On Sep 19, 2023, at 9:53 PM, B. Graedel <brikathy@...> wrote:

?

Not sure on how to contact the group, haven’t tried since it went to “IO?” or something like that.

Have a LGT145, 73-74 with a K321AS engine.? I thought perhaps the coil was going bad after 45+ years and purchased one via Ebay that was? supposed to fit.

When installed, the engine backfires thru the intake and exhaust, seem randomly.? Suspect the coil is for a newer K321 but not a vintage on like mine.? In conversations with the seller who is working with me, we measured the ohm resistance of the primary and the secondary and they are not the same as the original Jacobson/ford coil.? Is it possible I need an additional resistance block? Or just a different coil?

Thanks

brian
 

The coil may be fine. Try installing a new condenser.?


On Tue, Sep 19, 2023 at 8:53 PM, B. Graedel
<brikathy@...> wrote:

Not sure on how to contact the group, haven’t tried since it went to “IO?” or something like that.

Have a LGT145, 73-74 with a K321AS engine.? I thought perhaps the coil was going bad after 45+ years and purchased one via Ebay that was? supposed to fit.

When installed, the engine backfires thru the intake and exhaust, seem randomly.? Suspect the coil is for a newer K321 but not a vintage on like mine.? In conversations with the seller who is working with me, we measured the ohm resistance of the primary and the secondary and they are not the same as the original Jacobson/ford coil.? Is it possible I need an additional resistance block? Or just a different coil?

Thanks

brian

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