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Posted by Gunner Asch on November 23, 2008, 4:06 pm
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Im puttering around with the 1974 Honda XL 350...and the coil puts out a
weak spark...It may have something to do with the fact the lead wire to
the plug is only held on with the internal wire..the insulation is
broken around where its molded into the coil itself. I suppose I could
repair that with JB weld. The condenser is also molded as part of the
coil, and it may be bad, so I picked up a used condenser from a bike
yard and will splice it in.
I picked up a used generic 6vt coil for $10, and machined a mount to
adapt it to the bike. I tested the coil by grounding the hot lead by
scratching it to the frame and after 10 or 15 sparks, the coil split
around the circumference . It doesnt spark anymore...shrug. It had no
condenser attached to it. It "bumped" pretty good each time I sparked
it. Had a nice brite spark too.
Im testing the electrical with a 6vt battery charger hooked into place
of the battery
The wiring diagram I have and all references say that the Honda uses an
AC coil, fed by an ignition winding on the alternator. Honda wants $80
for a replacement coil, JC Whitney sells an aftermarket "can" coil for
$21, but doesnt indicate if its AC or DC.
Whats the difference between an AC and a DC coil????
Anyone got a surplus manual for a 1974-75 Honda XL 350?
Gunner
"They couldn't hit an elephant at this dist..."
Maj. Gen. John Sedgewick, killed by a sniper in 1864 at the battle of
Spotsylvania
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Posted by Terry Coombs on November 23, 2008, 4:23 pm
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Gunner Asch wrote:
> Im puttering around with the 1974 Honda XL 350...and the coil puts
> out a
> weak spark...It may have something to do with the fact the lead wire
> to
> the plug is only held on with the internal wire..the insulation is
> broken around where its molded into the coil itself. I suppose I could
> repair that with JB weld. The condenser is also molded as part of the
> coil, and it may be bad, so I picked up a used condenser from a bike
> yard and will splice it in.
>
> I picked up a used generic 6vt coil for $10, and machined a mount to
> adapt it to the bike. I tested the coil by grounding the hot lead by
> scratching it to the frame and after 10 or 15 sparks, the coil split
> around the circumference . It doesnt spark anymore...shrug. It had no
> condenser attached to it. It "bumped" pretty good each time I sparked
> it. Had a nice brite spark too.
>
> Im testing the electrical with a 6vt battery charger hooked into place
> of the battery
>
> The wiring diagram I have and all references say that the Honda uses
> an
> AC coil, fed by an ignition winding on the alternator. Honda wants
> $80
> for a replacement coil, JC Whitney sells an aftermarket "can" coil for
> $21, but doesnt indicate if its AC or DC.
>
> Whats the difference between an AC and a DC coil????
>
> Anyone got a surplus manual for a 1974-75 Honda XL 350?
>
> Gunner
>
> "They couldn't hit an elephant at this dist..."
> Maj. Gen. John Sedgewick, killed by a sniper in 1864 at the battle of
> Spotsylvania
Gunner , think about it for a minute - if that voltage input to the coil
was AC , it'd be buzzin' all the time . There's gotta be a diode , or more
likely a plate rectifier (My '74 CB750 has one of those on the 3 phase
output from the alt coils) between that coil and the supply .
And a metal-filled epoxy on a high-voltage application ? The weak spark is
more likely from a bad cap . Do ya get like a giant spark when ya break the
circuit ? Sure sign of a bad cap .
--
Snag
sometimes ya gotta
shovel manure
to pay the bills
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Posted by Gunner Asch on November 24, 2008, 2:52 am
Please log in for more thread options On Sun, 23 Nov 2008 15:23:07 -0600, "Terry Coombs"
>>
>> The wiring diagram I have and all references say that the Honda uses
>> an
>> AC coil, fed by an ignition winding on the alternator. Honda wants
>> $80
>> for a replacement coil, JC Whitney sells an aftermarket "can" coil for
>> $21, but doesnt indicate if its AC or DC.
>>
>> Whats the difference between an AC and a DC coil????
>>
>> Anyone got a surplus manual for a 1974-75 Honda XL 350?
>>
>> Gunner
>>
>> "They couldn't hit an elephant at this dist..."
>> Maj. Gen. John Sedgewick, killed by a sniper in 1864 at the battle of
>> Spotsylvania
>
> Gunner , think about it for a minute - if that voltage input to the coil
>was AC , it'd be buzzin' all the time . There's gotta be a diode , or more
>likely a plate rectifier (My '74 CB750 has one of those on the 3 phase
>output from the alt coils) between that coil and the supply .
>
> And a metal-filled epoxy on a high-voltage application ? The weak spark is
>more likely from a bad cap . Do ya get like a giant spark when ya break the
>circuit ? Sure sign of a bad cap .
>--
>Snag
>sometimes ya gotta
>shovel manure
>to pay the bills
Here is the wiring diagram...check it out for yourself
http://www.cmsnl.com/classic-honda-fansite/honda_wiring_diagrams/XL350.jpg
Thanks guys for the heads up on JB Weld..Id not remembered that it was
metal filled.
Gunner
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Posted by Terry Coombs on November 24, 2008, 6:30 am
Please log in for more thread options Gunner Asch wrote:
> On Sun, 23 Nov 2008 15:23:07 -0600, "Terry Coombs"
>
>>>
>>> The wiring diagram I have and all references say that the Honda uses
>>> an
>>> AC coil, fed by an ignition winding on the alternator. Honda wants
>>> $80
>>> for a replacement coil, JC Whitney sells an aftermarket "can" coil
>>> for $21, but doesnt indicate if its AC or DC.
>>>
>>> Whats the difference between an AC and a DC coil????
>>>
>>> Anyone got a surplus manual for a 1974-75 Honda XL 350?
>>>
>>> Gunner
>>>
>>> "They couldn't hit an elephant at this dist..."
>>> Maj. Gen. John Sedgewick, killed by a sniper in 1864 at the battle
>>> of Spotsylvania
>>
>> Gunner , think about it for a minute - if that voltage input to the
>> coil was AC , it'd be buzzin' all the time . There's gotta be a
>> diode , or more likely a plate rectifier (My '74 CB750 has one of
>> those on the 3 phase output from the alt coils) between that coil
>> and the supply .
>>
>> And a metal-filled epoxy on a high-voltage application ? The weak
>> spark is more likely from a bad cap . Do ya get like a giant spark
>> when ya break the circuit ? Sure sign of a bad cap .
>> --
>> Snag
>> sometimes ya gotta
>> shovel manure
>> to pay the bills
>
>
> Here is the wiring diagram...check it out for yourself
>
> http://www.cmsnl.com/classic-honda-fansite/honda_wiring_diagrams/XL350.jpg
>
> Thanks guys for the heads up on JB Weld..Id not remembered that it was
> metal filled.
>
> Gunner
If I'd had my head in the light , I'd have realized that the ignition
system is basically a magneto with the coils in separate units .
Hey , embarassment can lead to learning too !
--
Snag
sometimes ya gotta
shovel manure
to pay the bills
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Posted by Cliff on November 24, 2008, 12:30 pm
Please log in for more thread options wrote:
> Gunner , think about it for a minute - if that voltage input to the coil
>was AC , it'd be buzzin' all the time . There's gotta be a diode , or more
>likely a plate rectifier (My '74 CB750 has one of those on the 3 phase
>output from the alt coils) between that coil and the supply .
Magneto.
--
Cliff
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> out a
> weak spark...It may have something to do with the fact the lead wire
> to
> the plug is only held on with the internal wire..the insulation is
> broken around where its molded into the coil itself. I suppose I could
> repair that with JB weld. The condenser is also molded as part of the
> coil, and it may be bad, so I picked up a used condenser from a bike
> yard and will splice it in.
>
> I picked up a used generic 6vt coil for $10, and machined a mount to
> adapt it to the bike. I tested the coil by grounding the hot lead by
> scratching it to the frame and after 10 or 15 sparks, the coil split
> around the circumference . It doesnt spark anymore...shrug. It had no
> condenser attached to it. It "bumped" pretty good each time I sparked
> it. Had a nice brite spark too.
>
> Im testing the electrical with a 6vt battery charger hooked into place
> of the battery
>
> The wiring diagram I have and all references say that the Honda uses
> an
> AC coil, fed by an ignition winding on the alternator. Honda wants
> $80
> for a replacement coil, JC Whitney sells an aftermarket "can" coil for
> $21, but doesnt indicate if its AC or DC.
>
> Whats the difference between an AC and a DC coil????
>
> Anyone got a surplus manual for a 1974-75 Honda XL 350?
>
> Gunner
>
> "They couldn't hit an elephant at this dist..."
> Maj. Gen. John Sedgewick, killed by a sniper in 1864 at the battle of
> Spotsylvania