27-02-17, 07:50 PM
The main issue here is that you are unsure if it came on gradually or suddenly
Suddenly would point more to Electrics whereas slowly might point more to items wearing.
Since the Motad Stainless is a common replacement it is unlikely the fault lies there
The only way to resolve it is to rule things out with a check list and literally trial and error
Fuel tank breather
Plug Caps
Check the resistance as the internal carbon resistors can break down and put the resistance to meg ohms intermittently.
(I replaced the internal resistors with ones from old NGK Caps)
Coils & leads
Air filter (K&N is a good replacement)
Fuel filter
Fuel flow (Tap and Pump)
Choke operation
Carb Balance
TPS
Plugs
Intake Manifolds
Carburetor Diaphragms (can be removed with carbs in situ)
If all above check out and you have changed the Rectifier/Regulator (but no guarantee it is working properly as the faulty one I had tested OK statically)
Then remove the carbs and check them, including the Pilot screws.
When the carbs are off check the valve clearances
Suddenly would point more to Electrics whereas slowly might point more to items wearing.
Since the Motad Stainless is a common replacement it is unlikely the fault lies there
The only way to resolve it is to rule things out with a check list and literally trial and error
Fuel tank breather
Plug Caps
Check the resistance as the internal carbon resistors can break down and put the resistance to meg ohms intermittently.
(I replaced the internal resistors with ones from old NGK Caps)
Coils & leads
Air filter (K&N is a good replacement)
Fuel filter
Fuel flow (Tap and Pump)
Choke operation
Carb Balance
TPS
Plugs
Intake Manifolds
Carburetor Diaphragms (can be removed with carbs in situ)
If all above check out and you have changed the Rectifier/Regulator (but no guarantee it is working properly as the faulty one I had tested OK statically)
Then remove the carbs and check them, including the Pilot screws.
When the carbs are off check the valve clearances