No spark

R

Rick McElroy

New Member
when I parked it 6 yrs or so ago ran fine. Now there's no spark, I've changed the points and condenser. Could it be the mag/ stator behind fly wheel? And how do I check it? Thanks in advance
 
6

69ST

Well-Known Member
It's possible, but highly doubtful. Coil failures on these machines are rare. You didn't mention the model, so I'll add a wild-assed guess to the short list. If your bike has a handlebar-mounted kill switch, make sure it's in the "on" position. Seems almost insulting but it's not, simple as it is, it's almost too easy to overlook. Next up, do you have a battery plugged-in? The primary circuit is routed through the battery connector, to prevent you from running the bike sans battery (the battery is the voltage regulator, with it all the bulbs will pop). There are two black leads in the plug, the battery half of the connector has a jumper that connects them, just by plugging-in a battery.

I'll stop the verbiage here, for now. May as well try the easy, obvious and most common stuff first.
 
R

Rick McElroy

New Member
racerx said:
It's possible, but highly doubtful. Coil failures on these machines are rare. You didn't mention the model, so I'll add a wild-assed guess to the short list. If your bike has a handlebar-mounted kill switch, make sure it's in the "on" position. Seems almost insulting but it's not, simple as it is, it's almost too easy to overlook. Next up, do you have a battery plugged-in? The primary circuit is routed through the battery connector, to prevent you from running the bike sans battery (the battery is the voltage regulator, with it all the bulbs will pop). There are two black leads in the plug, the battery half of the connector has a jumper that connects them, just by plugging-in a battery.

I'll stop the verbiage here, for now. May as well try the easy, obvious and most common stuff first.
Click to expand...
I unplugged the handle bar kill button, no luck. Removed battery years ago, ran without one. 1970 Ct70
 
R

Rick McElroy

New Member
The green wire im holding goes to the kill button on the handle bar
 

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CollegeCrankCase

CollegeCrankCase

Member
See the black power wire plugged in below? I would recommend unplugging it and putting a lead wire into it. Ground the plugged-in lead to your engine and kick it over.
If it sparks, you have electricity (however small but at least some) coming from your stator. If not, the electrical issues are coming from inside the magneto.
This helped me when I needed to isolate my blown ignition coil issue.
20200521-100649-2.jpg
 
red69

red69

Well-Known Member
To add to what Kirrbby stated, the button would be for the horn with the green wire being a ground to complete the circuit when it is depressed. A kill switch is just that, a switch with on and off positions. On later models, it is a rotary switch with two "Off" positions and a center position which is "Run".
 
OLD CT

OLD CT

Well-Known Member
Never was interested in a kill switch on a ct70. I prefer to turn the key and remove it, when I shut the bike off.
 
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