Armen
Serious Thumper
Offline
Half-Witted Wrench-Jockey from Jersey
Posts: 1432
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OK, the stories: I had a '79 XL250S. Needed major top end surgery. It also had a bad leak between the head and valve cover. I decided to lap the top of the head and the bottom of the cover. Had to do a lot of lapping before I saw that both surfaces were flat. Bike started right up, and ran for seconds before going SQUEAK! and stalling I had wiped out the clearance, and no oil was getting to the cam journals. Took it apart and started with coarse lapping compound, then fine compound, then aluminum polish, repeatedly checking the clearance, then hosed it forever with contact cleaner. SUCH a pain in the butt. Another time a customer had lost one of the cam caps on a GS750. Found a used one and had to do the same voodoo to it. Probably impregnated the metal with some abrasives. woof.
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