Armen
Serious Thumper
Offline
Half-Witted Wrench-Jockey from Jersey
Posts: 1452
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IIRC there was a short run of BMW 250 singles in the 60's that were known to do that. My '79 XL250 dropped an ex seat. With the BMWs, the parts were scarce and expensive, so I sent them out to be fixed. Machine out the seat boss, TIG weld up, re-machine, install seat. Use the guide bore as a locating device. Unless the guide was toast, Then... Needless to say, unless you have a machinist that works for free, or have the equipment yourself, a good used head makes sense. On my XL, I bought a new head.
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