foxhoundando
New member
Looking for some advice on a Yamaha F100A (carby, CDI ignition).
No plate but I believe around 2006 model
Motor was running fine, then after a few minutes started spluttering under load and died. Since then I've had no spark on any cylinder.
Here's what I've checked so far:
Kill switch circuit (white wire) checks out. Open circuit with key ON/lanyard in, continuity to ground with key OFF or lanyard removed.
Ignition coils:
Secondary: 4.3 kΩ
Primary: ~0.002 k Ω
Pulser coil (meter on 20k range):
Black to Blue = 0.53 kΩ
Black to Red/White = 0.53 kΩ
Blue to Red/White = 1.06 kΩ
Charging stator (3 yellow wires):
Any yellow to any yellow = 0.04 Ω (all equal)
Regulator/rectifier tested OK.
Fuel pump primes.
Confirmed no spark with both a grounded spark plug and a timing light.
I haven't checked the three yellow wires to ground yet, and I don't have a DVA adapter to do peak voltage tests.
Before I spend money on a CDI, is there anything obvious I'm missing? Has anyone had an F100A do exactly this and it turned out to be something other than the CDI?
No plate but I believe around 2006 model
Motor was running fine, then after a few minutes started spluttering under load and died. Since then I've had no spark on any cylinder.
Here's what I've checked so far:
Kill switch circuit (white wire) checks out. Open circuit with key ON/lanyard in, continuity to ground with key OFF or lanyard removed.
Ignition coils:
Secondary: 4.3 kΩ
Primary: ~0.002 k Ω
Pulser coil (meter on 20k range):
Black to Blue = 0.53 kΩ
Black to Red/White = 0.53 kΩ
Blue to Red/White = 1.06 kΩ
Charging stator (3 yellow wires):
Any yellow to any yellow = 0.04 Ω (all equal)
Regulator/rectifier tested OK.
Fuel pump primes.
Confirmed no spark with both a grounded spark plug and a timing light.
I haven't checked the three yellow wires to ground yet, and I don't have a DVA adapter to do peak voltage tests.
Before I spend money on a CDI, is there anything obvious I'm missing? Has anyone had an F100A do exactly this and it turned out to be something other than the CDI?