I've got a 1999 Dyna Lowrider with a carbureted Twin Cam 88 with about 24,500 miles. Recently I've been noticing a noise coming from the engine area that sounds like chirping or kind of like crickets. It doesn't do it 100% of the time but something like 70 to 80%. Depends on the throttle position so I suspect the noise is coming from the carburetor but it's difficult to pinpoint since it doesn't do it unless the engine is pulling. I'm wondering if there might be a vacuum leak or maybe a tear in the diaphragm. The engine runs fine for the most part but it has stalled a couple times when trying to accelerate from a dead stop after sitting at idle at a red light. Don't know if that's related to the noise or not. Do I need to rebuild the carb?

 

Check out these threads:

https://www.hdforums.com/forum/evo-c...ing-chirp.html

https://www.hdforums.com/forum/evo-c...er-load-4.html

 

So, I looked through the threads you (mmesa005) sent and a majority referenced the drive belt although one or two mentioned the carb. I really don't think it is a drive belt issue as the noise seems to be coming from the front of the bike and on the right side from the carburetor area. I'm just not sure what to do about it.

 

I would bet it's a leaking head gasket.

 

Process of elimination. If you not certain of the cause eliminate the possibilities.

 

So I found the culprit. Turns out it was the battery cover lid. I replaced the battery a few weeks ago and now that I think about it, that's when the noise started. Not sure why it's loose fitting now when it never was before but a little padding material between the lid and the frame did the job.

 

Nice when it's a simple fix!

 

There should be a molded rubber cushion that "snaps" into holes in the frame/pan just above the battery.

p/n: 66033-96 (discontinued from MoCo but may be available used or reproduction (v-twin mfg))

 

The rubber piece is there but it might be worn out. Thanks tho!