Question about Harley Davidson FLSTF Fat boy Motorcycles
Spark from plugs seems to be inconsistent checked it once and there was spark, checked it again there was not. fires occasionally but wont run. New plugs, new wires, new coil, new fuel filter, new fuel, freshly cleaned carb. Suggestions?
Some after market ignitions don't spark on the first couple of turns but first take off your air cleaner twist the throttle and look to see if gas is spraying in the carb if not give it a little starting fluid if it fires but then dies then its carb issue. now other thing to check is if you have three posts on your coil then its single fire and your plug wires might be going to the wrong spot switch um around.
Posted on May 18, 2014
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Posted on Jan 02, 2017
SOURCE: Rear cylinder not firing
The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.
Posted on Dec 08, 2008
SOURCE: YZ 450 STARTING PROBLEM
Hi and welcome to FixYa,
Offhand, the backfire is significant. It indicates that fuel is getting inside the combustion chamber and it further confirms that there is spark. Being the case, it would appear that this is now a timing issue. A couple of ideas to explore:
Posted on Dec 15, 2008
clean contacts on points with sandpaper (800 grit). located behind flywheel, will gurantee a fix. you can remove the side cover and get to contacts through holes in flywheel without removing it.
Posted on Nov 16, 2009
Replace the spark plug caps and try again. On Honda's the cap is often part of the wire (a dealer part) NGK makes some inexpensive plug caps about $5 each. They should OHM out to 5000 anything above or below and you need to replace them. This should fix the problem.
Posted on May 27, 2010
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