Compression release thumb lever CRTL opens the exhaust valve to release compression for starting
Compression release button CRB, Button is located on the head, push button to release the compression , When engine fires it closes the button, button is spring loaded
1999-2007 WC-1 & NE-5 Whizzers with a slip clutch or an Auto Clutch have a CRTL
2008 the CVT trans and electric came out on some NER Whizzers so those had a CRB on the head
NER without the CVT trans and electric start Had an auto clutch and a CRTL
2009 Ambassador CVT trans and electric start had the CRB on the head, No pedals either
Whizzer CRB spring would fail after getting hot too many times causing the valve to stay open Failure
Aftermarket CRB for Flat Head Harley's could be bought as replacements
I like the CRTL The head is too damn hot after riding a bit to push a CRB anyways, Burn Yourself