XR600 timing chain dramas
I just recently bought a 1990 XR600R (20,000km's on the clock) from a mate who reckons "it just stopped one day and I couldn't be bothered fixing it". The way he was describing what happened made it sound like the timing chain tensioner had let go. Bad news. However when I took it apart I found it in great condition with no apparant damage to the valves, bore, piston or anything else so I just replaced the tensioner and the standard things like rings, seals etc and fired it up.
It started fine around 6-7 times while testing things like lights and on the first run-in ride of about 5 mins it ran perfectly. All of a sudden when I pulled up it sounded like the timing chain was loose again. I have been told that the timing chain AND guides (which were in good condition) need to be replaced every 20,000km's or so but that sounds pretty rediculous as all the other hondas I have owned haven't needed it. Has anyone else had this problem? Anything specific that I should look for when taking it apart again?