Bought a 2012 Street Glide. The 103 " motor comes with compression release valves. I am wondering if any one has had any problem with them sticking open or other problem. Seems like something not needed. I know they can be disabled with turner. Should I do this.

 

I would not disable them..You probably would like to keep the starter and the ring gear intact as well as a few other goodies..

 

Some hot day in July when you been running for hours and pull over to get a soda and shut down for 5 minutes you'll need them. Your motor will get heat soaked and without them she would sound and feel like a horse gasping deeply for air when you try to crank her over. With them you'll fire up np. Sort of not missing something till it's gone sort a thing. Leave them be.

 

your out on the road staying in a hotel , cold out , you get up the next morning , temperature zapped your battery a little , with them you start , without them your looking for a jump

 

My last bike was 07 SG was a great bike compression was 9.2:1 This new 12 SG is 9.6:1. There is alot of bikes with head work over 10:1 no releases. I thougth 10:1 is not high, is that correct. I'm also thinking if the compression releases stick open with carbon or something that it can really do damage. Thanks for the come back

 

9.6:1 compression shouldn't need compression releases. Been running 10.5:1 in a 95" motor for 3+ years and have never had any starting issues without them. Been wondering why HD elected to run those things on a stock motor.
Maybe someone else here has the answer.

 

what's your corrected compression? If you're running a late cam, your cranking pressure could be lower than a stock motor.

 

Bingo!


...

 

those ACRs seemed a little problematic at first but you dont see many guys bitching about them now so I guess they are well sorted.

dewky

 

Hate to answer a question with a question but it's still relative: what's the corrected stock compression on the new 103's? (My bet is less than the advertised 9.6:1.)
Mine's 9.8:1, corrected. Plus I have a bud that finally trash canned his stock automatic releases on his 110 CVO ('07) because they never ever worked correctly. To their credit, his dealer tried many times to get them to work but they never got them to any dependable level so he $hit-canned 'em. He's since done even more motor work than me and doesn't miss those problematic releases one bit. He runs a true 10:1 and has never needed any compression releases either.