To find out if its rings gone, pour a table spoon of oil into cylinder and if that gives you a little more compression, then its the rings. Otherwise check if head gaskets blown or tight/damaged valves(remove rocker cover) and turn engine over to see them moving or not! isn't the XR a sporty XL?
Ted
May 2011
if its a two stroke engine .then piston rings could be seized.
rayb
May 2011
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