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Gaskets

The head gasket is sandwiched between the Cylinder Head and the Block to seal combustion within the combusion chamber. This gasket is not to be reused after a rebuild, and should be replaced any time the head is removed. Most performance head gaskets on the market today are composed of mulitple layers of steel (MLS) material. You can either select a gasket that matches your bore size, or it is also common practice to go with a gasket that has a bore diameter 0.5mm larger than your piston. A gasket that with a thickness that is larger than stock will lower the compression ratio advertised for your pistons, and a gasket with a thickness thinner than stock will raise the compression ratio advertised for your pistons.

To learn more about how attributes influence piston selection, click here to read the Gasket section of Jay's Bottom End Buyers Guide...
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Items 1-12 of 91

Set Descending Direction
  1. Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 86mm 0.018" Thick
    SKU# H2992018S
    Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 86mm 0.018" Thick
    $126.19
    Call
    Specs
    Specs
    Head Gasket Bore Diameter 86mm (STD)
    Head Gasket Thickness 0.018in / 0.46mm
    Head Gasket Material MLS
  2. Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 86mm 0.027" Thick
    SKU# H2992027S
    Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 86mm 0.027" Thick
    $126.19
    Call
    Specs
    Specs
    Head Gasket Bore Diameter 86mm (STD)
    Head Gasket Thickness 0.027in / 0.69mm
    Head Gasket Material MLS
  3. Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 90mm 0.030" Thick
    SKU# H2992SP5030S
    Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 90mm 0.030" Thick
    $126.19
    Call
    Specs
    Specs
    Head Gasket Bore Diameter 90mm (+0.160in Over)
    Head Gasket Thickness 0.030in / 0.76mm
    Head Gasket Material MLS
  4. Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 86mm 0.036" Thick
    SKU# H2992036S
    Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 86mm 0.036" Thick
    $126.19
    Call
    Specs
    Specs
    Head Gasket Bore Diameter 86mm (STD)
    Head Gasket Thickness 0.036in / 0.91mm
    Head Gasket Material MLS
  5. Cometic MLS-5 Head Gasket Yamaha 08-21 FX SHO SVHO FZR 90mm 0.077" Thick
    SKU# H2992SP5077S
    Cometic MLS-5 Head Gasket Yamaha 08-21 FX SHO SVHO FZR 90mm 0.077" Thick
    $189.52
    Call
    Specs
    Specs
    Head Gasket Bore Diameter 90mm (+0.160in Over)
    Head Gasket Thickness 0.077in / 1.95mm
    Head Gasket Material MLS
  6. Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 86mm 0.040" Thick
    SKU# H2992040S
    Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 86mm 0.040" Thick
    $126.19
    Call
    Specs
    Specs
    Head Gasket Bore Diameter 86mm (STD)
    Head Gasket Thickness 0.040in / 1.0mm
    Head Gasket Material MLS
  7. Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 88mm 0.027" Thick
    SKU# H2992SP2027S
    Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 88mm 0.027" Thick
    $126.19
    Call
    Specs
    Specs
    Head Gasket Bore Diameter 88mm (+0.080in Over)
    Head Gasket Thickness 0.027in / 0.69mm
    Head Gasket Material MLS
  8. Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 88mm 0.045" Thick
    SKU# H2992SP2045S
    Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 88mm 0.045" Thick
    $126.19
    Call
    Specs
    Specs
    Head Gasket Bore Diameter 88mm (+0.080in Over)
    Head Gasket Thickness 0.045in / 1.14mm
    Head Gasket Material MLS
  9. Cometic Copper Head Gasket Yamaha 08-21 FX SHO SVHO FZR 92mm 0.032" Thick
    SKU# H2992SP4032C
    Cometic Copper Head Gasket Yamaha 08-21 FX SHO SVHO FZR 92mm 0.032" Thick
    $93.27
    Call
    Specs
    Specs
    Head Gasket Bore Diameter 92mm (+0.240in Over)
    Head Gasket Thickness 0.032in / 0.81mm
    Head Gasket Material Copper
  10. Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 89mm 0.040" Thick
    SKU# H2992SP7040S
    Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 89mm 0.040" Thick
    $126.19
    Call
    Specs
    Specs
    Head Gasket Bore Diameter 89mm (+0.120in Over)
    Head Gasket Thickness 0.040in / 1.0mm
    Head Gasket Material MLS
  11. Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 86.5mm 0.018" Thick
    SKU# H2992SP8018S
    Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 86.5mm 0.018" Thick
    $126.19
    Call
    Specs
    Specs
    Head Gasket Bore Diameter 86.5mm (+0.020in Over)
    Head Gasket Thickness 0.018in / 0.46mm
    Head Gasket Material MLS
  12. Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 87mm 0.030" Thick
    SKU# H2992SPC030S
    Cometic MLS Head Gasket Yamaha 08-21 FX SHO SVHO FZR 87mm 0.030" Thick
    $126.19
    Call
    Specs
    Specs
    Head Gasket Bore Diameter 87mm (+0.040in Over)
    Head Gasket Thickness 0.030in / 0.76mm
    Head Gasket Material MLS
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  1. Real Street Powersports 91 items
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Make
  1. Arctic Cat 2 items
  2. Can-Am 4 items
  3. Polaris 3 items
  4. Sea-Doo 34 items
  5. Yamaha 50 items
Model
  1. FX SHO 2008-2015 48 items
  2. FX SVHO 2014-2021 48 items
  3. YXZ1000R 2016+ 2 items
  4. Wildcat XX 2018+ 2 items
  5. RZR XP 1000 2014+ 3 items
  6. RZR XP Turbo 2016+ 3 items
  7. RZR XP Turbo S 2018+ 3 items
  8. RZR Pro XP 2020+ 3 items
  9. RXP 215 04-10 34 items
  10. RXT 215 05-10 34 items
  11. GTX LIMITED 215 05-08 34 items
  12. GTX 215 08-13 34 items
  13. GTR 215 12-16 34 items
  14. WAKE PRO 215 10-15 34 items
  15. RXT-X 255 08-09 34 items
  16. RXP-X 255 08-11 34 items
  17. GTX LIMITED iS 255 2009 34 items
  18. GTX LIMITED iS 260 10-16 34 items
  19. RXT-X 260 10-15 34 items
  20. RXP-X 260 12-15 34 items
  21. RXT IS 260 10-12 34 items
  22. RXT 260 11-17 34 items
  23. Maverick X3 Turbo 2017-2019 4 items
  24. Maverick X3 Turbo/Turbo R & RR 20+ 4 items
Engine
  1. SHO 1.8L 48 items
  2. SVHO 1.8L 48 items
  3. Rotax 900 ACE 4 items
  4. 998cc DOHC 3cyl 2 items
  5. ProStar 1000 3 items
  6. ProStar Turbo 925 3 items
  7. Rotax 4-Tec 1503 Supercharged 34 items
Brand
  1. Brian Crower 8 items
  2. Cometic 83 items
Bore
  1. 74.5mm (0.020" Over) 1 item
  2. 75mm (0.040" Over) 3 items
  3. 80mm (Standard Bore) 1 item
  4. 82mm (0.080" Over) 1 item
  5. 86.5mm (0.020" Over) 6 items
  6. 86mm (Standard Bore) 13 items
  7. 87.5mm (0.060" Over) 3 items
  8. 87mm (0.040" Over) 3 items
  9. 88.5mm (0.100" Over) 6 items
  10. 88mm (0.080" Over) 7 items
  11. 89mm (0.120" Over) 3 items
  12. 90mm (0.160" Over) 5 items
  13. 91mm (0.200" Over) 1 item
  14. 92mm (0.240" Over) 1 item
  15. 95mm (0.080" Over) 2 items
  16. 98mm (0.200" Over) 1 item
  17. 100.5mm (0.020" Over) 5 items
  18. 100mm (Standard Bore) 5 items
  19. 101mm (0.040" Over) 15 items
  20. 102.5mm (0.100" Over) 1 item
  21. 102mm (0.080" Over) 3 items
  22. 103mm (0.120" Over) 5 items
Carb Legal
  1. No 88 items
  2. Unspecified 3 items
Gasket Material
  1. MLS 75 items
  2. MLX 8 items
  3. Copper 8 items
Bore Diameter
  1. 100.5mm 5 items
  2. 100mm 5 items
  3. 101mm 15 items
  4. 102.5mm 1 item
  5. 102mm 3 items
  6. 103mm 5 items
  7. 74.5mm 1 item
  8. 75mm 3 items
  9. 80mm 1 item
  10. 82mm 1 item
  11. 86.5mm 6 items
  12. 86mm 13 items
  13. 87.5mm 3 items
  14. 87mm 3 items
  15. 88.5mm 6 items
  16. 88mm 7 items
  17. 89mm 3 items
  18. 90mm 5 items
  19. 91mm 1 item
  20. 92mm 1 item
  21. 95mm 2 items
  22. 98mm 1 item
Bore Oversize
  1. 0.020" / 0.5mm 12 items
  2. 0.040" / 1.0mm 21 items
  3. 0.060" / 1.5mm 3 items
  4. 0.080" / 2.0mm 13 items
  5. 0.100" / 2.5mm 7 items
  6. 0.120" / 3.0mm 8 items
  7. 0.160" / 4.0mm 5 items
  8. 0.200" / 5.0mm 2 items
  9. Standard Bore 19 items
  10. 0.240" / 6.0mm 1 item
Gasket Thickness
  1. 0.018" / 0.46mm 4 items
  2. 0.020" / 0.5mm 2 items
  3. 0.024" / 0.6mm 1 item
  4. 0.025" / 0.64mm 1 item
  5. 0.027" / 0.69mm 10 items
  6. 0.028" / 0.7mm 3 items
  7. 0.030" / 0.76mm 15 items
  8. 0.032" / 0.81mm 5 items
  9. 0.036" / 0.91mm 8 items
  10. 0.040" / 1.0mm 15 items
  11. 0.043" / 1.1mm 2 items
  12. 0.045" / 1.14mm 3 items
  13. 0.050" / 1.27mm 2 items
  14. 0.051" / 1.3mm 6 items
  15. 0.052" / 1.32mm 1 item
  16. 0.056" / 1.42mm 2 items
  17. 0.060" / 1.52mm 3 items
  18. 0.066" / 1.68mm 1 item
  19. 0.075" / 1.91mm 1 item
  20. 0.077" / 1.95mm 2 items
  21. 0.080" / 2.0mm 1 item
  22. 0.084" / 2.13mm 1 item
  23. 0.089" / 2.26mm 1 item
  24. 0.098" / 2.49mm 1 item

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