The 1999 Isle of Man TT Production Race turned into a Yamaha R1 battle as lap and race records were set. Iain Duffus led David Jefferies at the end of lap one by just 0.9 seconds with Phillip McCallen (now Yamahamounted) third. Duffus set a new lap record second time around at 121.32mph to lead Jefferies by 27.2 seconds, Griffiths taking third place from McCallen.

The Iain Duffus charge to victory ended at CronknyMona on the final lap, leaving David Jefferies to take the chequered flag at a record 119.50mph by 25.7 seconds from Jason Griffiths with Phillip McCallen in third place.

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