I've put a fresh GENERIC kernel up at 
ftp://ftp.netbsd.org/pub/NetBSD/arch/vax/kernels/

They are:

-rwxr-xr-x  1 matt  netbsd   55384 Apr 23 20:03 boot-1.4X-VS4000
-rw-r--r--  1 matt  netbsd   76288 Apr 23 20:02 boot.mop-1.4X-VS4000
-rwxr-xr-x  1 matt  netbsd  666313 Apr 23 19:58 netbsd-1.4X-VS4000.gz
-rwxr-xr-x  1 matt  netbsd    5732 Apr 23 20:02 xxboot-1.4X-VS4000

Enjoy!
-- 
Matt Thomas               Internet:   matt@3am-software.com
3am Software Foundry      WWW URL:    http://www.3am-software.com/bio/matt/
Cupertino, CA             Disclaimer: I avow all knowledge of this message