What causes weak spark on ATV?
The most common reason an ATV is getting no spark is a bad spark plug, either the wrong plug all together or just not gapped correctly. Or the spark plug just went bad, that happens quite often and it’s normal.
What causes weak spark on a dirt bike?
Weak spark occurs when the primary side of the ignition coil short circuits within the coil windings.. This includes worn, fouled or damaged spark plugs, bad plug wires or a cracked distributor cap. …
Will bad CDI cause weak spark?
Sometimes, a bad CDI does not cause sparks at all. Again, when a CDI box is about to go bad, it can lead to misfires, issues with starting, rough running or even stall the motor. Therefore, the only way you can tell whether your CDI has a problem is by confirming that everything else is in the right condition.
How do you know if your spark is weak?
A good spark will be blue-white and will be plainly visible in daylight. If a good spark is present, the problem is probably not in the ignition system. Check the fuel system and/or stark timing. Weak sparks are orange or red and may be hard to see in daylight.
Why is my Big Bear 400 spark not working?
I pulled the stator housing and found that the primary coil (or what ever you might call it) was mounted upside down, I removed it, turned it over, remounted it and now the machine runs perfectly. Here is some info I could not find on line regarding the primary coil:
Where does the spark come from on a Big Bear?
It is from the kill switch and ignition key switch, test from the negative side on the battery to this wire in the CDI plug with ignition on and kill switch off. It should be an open circuit. when you press the kill switch or turn off the key it should be a closed circuit. This will eliminate a couple of suspects.
Where is the ground wire on a Big Bear?
There will be a ground wire at the CDI plug (or plugs) (black on the Big Bear). It is from the kill switch and ignition key switch, test from the negative side on the battery to this wire in the CDI plug with ignition on and kill switch off.
Is the white stripe on a big bear positive or negative?
White with blue stripe is positive from the primary coil pin to CDI. White with red stripe is negative from the primary coil pin to CDI. I hope this information helps somebody.