|1. Egine does not start despite proper ignition and adequate fuel
is this just a hard start, meaning having to pump and pump to get fuel moving to the carburetors? Adding an
electric fuel pump to prime the carburetors may be needed. Modern fuels evaporate quickly leaving carburetor
a ) no fuel in the system: Check fuel supply lines, with ignition off detach fuel line connecting pump with
carburetors and be sure that there is fuel flowing from pump to carbs. If not, pump is the problem.
if there is fuel in the system check the float needle valve, the main jets and the injectors for fuel delivery.
Make sure the carburetor pump system is working.
Is distributor and/or spark plugs working to ignite fuel mixture
b) too much fuel in the system: check float needle valve, float levels, fuel pump pressure, injection
2. Uneven idling: a) improperly adjusted idling - adjust idle mixture screws, idle adjustment screw.
b) idle jets or idle air jets or passageways plugged or uneven sizing - clean jets, check sizing
c) air leaks - worn throttle plates, worn out gaskets allowing air leaks, overly tightened carb bolts
causing warping in the carb body, worn throttle shafts,
d) defective idle mixture screws - points damaged with over tightening, threads stripped from over
e) check distributor for proper advance and holding idle more HERE
3.Poor Power transition (flat spot): a) worn throttle plates and/or throttle shaft
b) idle adjustment too lean or too rich
c) improper float level (too high or too low)
d) improper injection quantity (too high or too low)
e) shifting at too low a speed causing rpm's to drop too low
f) carbs not synched
4. engine stalls when throttle lever is quickly closed improper idle adjustment, check throttle arm
5. engine runs unevenly, misses, backfires a) mixture too rich - check fuel pump pressure, float level,
injection, float needle valve, distributor
b) mixture too lean - check fuel lines, float level, clean jets, check distributor
c) check for air leaks
6. High fuel consumption - recommend keeping track of your mileage/fuel. seeing your mpg average
drop (it will always vary by the type of driving) is one of the first indications of a problem
a) carbs running rich or ineffectively - check all the above
b) check distributor, points and plugs
c) check driving habits
And when all else fails, call 356 Carburetor Rescue!