Question about Harley Davidson XLH Sportster 883 Hugger Motorcycles
What is the gap for spark plug
Posted by Anonymous on
Hi Anonymous, .060" gap. Harley Davidson spark plug number 4 Good luck
Posted on May 11, 2015
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Posted on Jan 02, 2017
There are a few reasons for this to happen. You could have a vacuum leak on your intake manifold. You could have a bad spark plug. You could have a valve adjusted too tightly. You could have low compression. The list is long.
When is the last time you adjusted your valves? The Ironhead Sportster has solid lifters instead of hydraulics like the rest of the Harleys. They must be adjusted on a regular basis or you can have problems such as running on one cylinder. With the engine stone cold, you must adjust the pushrods so that they can just be rotated with your fingers. I bring the piston on one cylinder to TDC on the compression stroke and adjust both the intake and exhaust valves. Once finised with that cylinder, bring the other one to TDC and do those valves.
Put a new set of plugs in the bike. Ironheads are notorious for fouling plugs and once fouled, they usually won't "clear up" like on other models.
If you suspect you have a vacuum leak on your intake, you need to replace the 'rubber bands" on the intake manifold. If the clamps are in rough shape or are a poor design, replace them as well. A set of clamps are not that expensive.
Run a compression test or a leak down test on both cylinders. If they vary more than 10% between the two cylinders, this warrants a top end job.
Posted on Jan 22, 2010
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