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Yep. Remove all sharp edges from the combustion chamber, except the spark plug electrode. If any threads from the spark plug or spark plug hole show then the spark plug needs to be adjusted to have these covered. Excessive carbon deposits will cause pre-ignition since they can get red-hot -- fuel additives help reduce these. Toby Erkson air_cooled_nut@pobox.com <-- Please use this address for email '72 VW Squareback 1.6L bored and stroked to 2.0L, Berg five-speed '75 Porsche 914 1.8L, ORPCA member Portland, Oregon, http://www.pobox.com/~toby_erkson/ >-----Original Message----- >Is there a general fix for this (pre-ignition)? ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org