1. FZR600 (1989-1995):
- NGK: DPR8EA-9
- DENSO: IW27
2. FZR600R (1991-1995):
- NGK: DPR9EA-9
- DENSO: IU24
3. FZR600RR (1994-1995):
- NGK: DPR8EA-9
- DENSO: IW27
4. FZR600 Genesis (1996-1998):
- NGK: DPR8EA-9
- DENSO: IW27
5. FZR600R Thundercat (1996-2001):
- NGK: CPR9EA-9
- DENSO: IU24
Please note that these are general recommendations, and the actual spark plug requirements may vary depending on factors such as the specific variant, region, and performance modifications made to the bike. It's always best to refer to the owner's manual or consult with an authorized Yamaha dealer or a qualified motorcycle mechanic to confirm the correct spark plug specifications for your particular FZR600 model.