Question about Harley Davidson FXSTB Night Train Motorcycles
The backfiring though the carb is probably due to a lean mixture. The carbs are jetted extremely lean to meet EPA emissions levels. Also, the crankcase pressure is vented into the air filter to be recycled though the engine per EPA requirements. The same thing as the PCV valve on your automobile engine. When the engine coughs, it's will blow out a mist of oil because of this.
Now, you can have the carb rejetted to richen the mixture. I'd go up one size on the slow jet. Also check to make sure the accelerator pump is working properly. With the engine OFF, the air filter off, crank the throttle to the wide open position. You should see a stream of fuel squirt into the carb from the brass accelerator pump nozzle.
Since the crankcase pressure is vented to the air filter, oil will accumilate in the air filter. You must periodically remove the covers and clean the filter out. There are kits available on the aftermarket parts venue that will allow you to reroute your crankcase pressure away from the air filter.
Posted on Aug 03, 2010
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Posted on Jan 02, 2017
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