1984 wr500

I have the head off a wr500 1984 and there are three spark plug holes does any one know if the bikes came from the factory like this or if this is a custom job?Also does any one know of a better chain guide than stock rubber wheel?Is there not a gasket that goes between the head and the cylinder dont see one in any of the parts lists?

I have a cylinder and head off of an 500 auto of about that vintage and it only has one spark plug hole. Though I havn't looked at it before typing. It appears the head was the same for all of the 500 models, five of them that year wre wru xc cr ae. The cylinders for xc and cr appear different from the others from the sheet I looked at. The head and cylinder don't quite mate together like the 83. There is no head gasket. The chain guide is right in front of the rear sprocket it has two rollers but I usually only use a lower roller and a nylon block or something of the like for the upper one. It can be hard to find a roller that narrow and I often just buy it from husky and install bearings from an aftermarket one. It is the same roller used in the ninties the one I get. Or you can just use a somewhat wider aftermarket one. some of mine are drilled a little bigger for the 8mm bolt the aftermarket rollers come with. That other thing more towards the front the guys used roller skate wheels on back when the bikes were relatively new isn't all that necessary you don't see it on anything modern.

That's a heck of an idea. I've always ended up machining my own wheels out of UHMW nylon.

My '83XC500 has but one plug hole...plus an extra that we machined in for a compression release.