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According to the Mick Hemmings engine build video, cam lift at TDC is the critical dimension when it comes to valve timing.


At TDC for a 2S cam inlet valve lift should measure .157"

Dots misaligned as found (timing to intermediate)  .178"

Dots aligned .135"

Timing advanced (see below).141"


At TDC for a 2S cam exhaust valve lift should measure .144"

Dots misaligned as found (timing to intermediate) .200"

Dots aligned .165"

Timing advanced (see below) .142


Timing advanced by rotating the cam sprocket one tooth clockwise and the intermediate gear three teeth anticlockwise.


I am not sure why the exhaust is so close (.002') and the inlet is off by .016".

I am guessing this is about as good as it gets.

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