Weird noise
Weird noise
Okay y'all, since my recent engine build on my 2009 FLHX, as you may guess I have been keyed in on the sounds my bike is making. I recently noticed a popping sound that appears to be coming through the air cleaner. Its got a high flow air cleaner which I have had on it for a few years (Zippers upgrade on stage 1 backing plate), but I didn't notice it before. Am I just hearing things that have always been there and its just more distinct now that the engine is moving more air? I can't really describe the sound other then it only really happens under a load, not lugging the bike but upon accelerating under a slight load in lower RPM range I seem to hear it more.
Am I going crazy and need to just double check everything again and ride it or has anybody else noticed this?
Not sure if touring or engine section was right place for this question, more people viewing this sections so I choose it.
Am I going crazy and need to just double check everything again and ride it or has anybody else noticed this?
Not sure if touring or engine section was right place for this question, more people viewing this sections so I choose it.
Road Warrior
Joined: Mar 2010
Posts: 1,418
Likes: 275
From: USA
What RPM are you talking about in your "lower RPM range"?
As far as lugging the motor, head wind, road grade, weight, and speed all have a factor.
I usually only ride in the 2500- 3200 RPM range, unless in the Rocky Mountains, then I can go higher. (low 4000)
As far as lugging the motor, head wind, road grade, weight, and speed all have a factor.
I usually only ride in the 2500- 3200 RPM range, unless in the Rocky Mountains, then I can go higher. (low 4000)
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
this can be reversion, exhaust pulses coming back up the tubes and through the cyclinder during the period when both valves are open ( esp with Carb, you'll smell fuel in the filter media).
changing the exhaust tract can tune this out, or move it to another rpm range.
it will be affected by any change in the length or diameter or restriction of the exhaust.
to test this: rev the bike to where it happens, get an assistant to put the sole of their boot partly over the end of the muffler. If it changes- then it is reversion
mike
Thread
Thread Starter
Forum
Replies
Last Post
Heza
General Harley Davidson Chat
9
Jun 8, 2015 07:31 PM
