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> One possible change I might try is to go back to the 009 dizzy the engine builder fitted, so it eliminates the vac advance curve not suiting the low end speed range. If it jerks the same on that, then I guess the dizzy is not the problem. This may take a while to try as I'll have to borrow or buy a good advance timing light to easily set the max advance to 32 degrees. My light is only a simple strobe and can't show the max advance as there's no mark. > If you use a tape to measure from TDC mark to the 10degrees BTDC mark, you should be able to measure out 3 of those from TDC and put a white line very close to where to time the 009. Somewhere on the archives there's a measurement for the pulley circumference, and no doubt someone out there has one on a bench that would be more easily measured. Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~