Question about Harley Davidson FXD Dyna Super Glide Motorcycles

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My 1999 Harley FXD makes a scraping noise and seems to loose compression and stalls at idle only. Noise seems to be coming from the top of the front cylinder. Runs fine under load. I removed rocker cover and cranked engine but didn't notice any bend in pushrods or seizure of rockers or valves. Any idea what may be causing this?

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The "scraping noise" is the crankcase vent venting the pressure out of your engine as it runs. In 1994, Harley moved the crankcase vent to the heads with is why most mechanics referred to bikes of this year model and later as "head breathers". The two large bolts that hold your air filter onto the engine's heads are hollow and that's what the vented air comes through. If you've replaced your stock air filter with a SE or aftermarket unit, you may be able to hear the vented air better due to the reduced restriction of the air filter.

Now, excessive crankcase pressure will increase the noise that you're hearing. This is caused by ring blowby is the rings are worn. My suggestion would be to have a compression or better yet, a leak down test done on the engine to determine the condition of the rigns. It may be time to replace the rings.

As for the stalling, I doubt that it's loosing compression. It's probably the idle speed is adjusted too low or the carb needs going through and a bit of tuning done to it.

If it''s fuel injectied, you'll need to take it to a shop that can reset the idle speed and such as it's all done electronically.

Good Luck
Steve

Posted on Oct 16, 2010

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