Black Box V5.1 Guía para resolver problemas descargar pdf (Pagina 40)

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EnDuraSpark Electronic Ignition

Installation & Troubleshooting v5.1

Troubleshooting – Poor Performance

We assume here that the performance problem is ignition related, i.e., the engine has good

compression, has a good battery and wiring, is getting gas, and has correctly adjusted valves. In

this context, “poor performance” is synonymous with “weak spark”. We also assume here that the

bike is timed correctly, with the correct DIP switch settings in the black box. The following

troubleshoots the potential faulty ignition components.

Bad Spark Plugs

Fouled plugs come from too much oil in the combustion chamber. The oil can be from

worn or broken rings, worn pistons/cylinders, or worn valve guides. If the problem only

occurs on the right cylinder, it may be a problem with the oil breather.

Burnt plugs come from too hot an engine or the wrong choice of spark plugs or coils.

Engines usually run hot due to too lean a fuel mixture or too advanced or retarded spark.

Check Correct Spark Plugs

These are the correct (stock) spark plugs:

Do not use Bosch resistor plugs, say for example a WR7DC+. These are plugs with a “R”

after then “W” in the part#. This plug is NOT equivalent to a Bosch W7DC spark plug

(even though Bosch says it is). In the US, non-resistor Bosch plugs are usually only

available at BMW motorcycle dealers - Bosch North America no longer imports non-

resistor spark plugs.

The spark plug gap on all Airheads, both Bosch and NGK, is 0.026-0.028". This may not

be how they are gapped from the factory. A smaller gap will foul more easily, especially

on /5 models with the shallow oil pan. Larger than specified gaps (like that shipped with

the Bosch) can cause low RPM misfires.

The factory recommended spark plug change interval was 10,000 miles when gasoline

contained lead. Modern unleaded fuel leads to longer service life: 20,000 miles is safe.

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Black Box V5.1 Guía para resolver problemas Pagina 40