The denso iridium spark plug for aprilia af1 125 1988 is part of the latest collection from denso.Features: six times harder than platinum, iridium withstands temperatures up to 4,000â f because the iridium electrodes of these plugs can be shrunk to only 0.4Mm, voltage requirements decrease while firing performance improves 360â laser welding of electrode provides a seal that resists wear even in the worst conditions ground electrode features a tapered cut and u-groove that form a large volume area for the flame's center specifications: center electrode projection: non-projected center electrode type: fine wire electrical resistance: 5k ohms electrode tip material: iridium ground electrode shape: grooved taper cut heat range: 10 hex size imperial: 13 16 hex size metric: 20.6 Mm hex size: 20.6 Mm 13 16 model: iw31 product name: spark plug research value: level 2 to fit: aprilia af1 125 1988 replica european models aprilia af1 125 1988 sintesi european models aprilia classic 125 1999 european models aprilia classic 125 2000 european models aprilia classic 125 2001 european models aprilia pegaso 125 1990 european models aprilia pegaso 125 1991 european models aprilia pegaso 125 1992 european models aprilia pegaso 125 1993 european models aprilia pegaso 125 1994 european models aprilia red rose 125 1991 european models aprilia red rose 125 1992 european models aprilia red rose 125 1993 european models aprilia red rose 125 1994 european models aprilia red rose 125 1995 europea...