Yes, it has to do with the wet-sump problem. Go to this website for more info and a video about it:
http://www.hoohoohoblin.com/RoyalEnfieldBullet500.htmlAlso, I was successful in replacing my decompression cable on my '45 WD CO by using the following procedure:
If you have an older RE(45 WD CO), then
you should read on. In order to replace the decompression cable (also called
the Exhaust Lifter Cable, which should be a clue of how it works!), you'll need
to access where the cable pulls the decompression lever, which is in the tappet
area. It's in this area because the decompression occurs by pushing up the
exhaust pushrod, which, of course, holds open the exhaust valve. Once you've
opened the tappet cover and located this mechanism, go ahead and remove the two
nuts where the decompression cable goes into the cylinder barrel, and then work
the nipple out of the decompression mechanism. When you do this, the spring
which provides tension on the system will fall down in the tappet area. Get the
spring out before continuing and pull the old cable completely out. When
installing the new cable, you'll need to insert the cable into the cyliner
barrel and first put in through the spring, and then put the nipple through the
decompression mechanism. At that point, you should be able to pull the cable,
which will then lift the exhaust pushrod. If it works, then tighten the two
outside nuts to secure the cable, and then insert the other end of the cable
into the handlebar control lever. Very simple.