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  #1 (permalink)  
Old 06-10-2021, 11:46 PM
Junior Member
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Join Date: Jun 2021
Location: Wake Forest, NC
Bike Year, Make, Engine: 2005 AIH Texas Chopper
Posts: 1
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Sucking/squeaking sound in my compression release valves

Hello everyone,

I'm new to the group and new to custom motorcycles in general. Been riding bikes for about 30+ years but sadly just got my first chopper a couple of months ago. it's a beauty though, a 2005 AIH Texas Chopper

I immediately noticed that my S&S engine makes this sucking/squeaking sound and I have identified that it is coming out of both of my Compression Release Valves. I have never had an engine with these things in it before now so I do not know if I am supposed to be hearing this strange sound out of them or not but it sure is annoying. I notice it only starts happening once the engine is warmed up but once it starts it just keeps on sucking/squeaking.

I have been around a lot of bikes with S&S engines in them and never heard this sound before and I find it hard to believe that none of those bikes had compression release vales in them so I'm thinking there is something wrong with mine.

It's seems like once the engine is warmed up, the spring in the compression release valves are too weak and are opening up under pressure and allowing air to pass by the rubber boot on them and thus the sucking/squeaking sound.

Anyone have any helpful tidbits on this subject? Do I need to replace them or is this normal. Because if it is normal than I'm planning on taking them out and plugging the holes because it sure is annoying.

Thanks in advance!!!
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