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The owner of this H-D Softail had running problems after some engine tuning – skimmed and ported heads, plus open pipes. And it wasn’t too difficult to find out why; it was using a big 190 main jet and was rich enough to effectively cancel out any gains from the headwork.

The poor thing was drowning in fuel. We reduced the size of the main jet and found an extra 8bhp! That’s how much it was over fuelling…

Too much fuel was killing this Softy... Now it's got a harder edge!

Too much fuel was killing this Softy… Now it’s got a harder edge!