ADA Racing Yamaha Cylinder Head Domes

ADA Racing Yamaha Cylinder Head Domes.

Note: Domes are sold individually.

Y701-81mm Bore Domes Part No.
Y701 37cc - 170lbs/91 Octane YA2137L
Y701 35cc - 185lbs/91 Octane YA2135L
Y701 34cc - 192lbs/95 Octane YA2134L
Y701 33cc - 200lbs/100 Octane YA2133L
Y701 31cc - 215lbs/110 Octane YA2131L
Y701 29cc - 230lbs/115 Octane YA2129L

Y760-84mm Bore Domes Part No.
Billet dome has .015” squish relief @ 86mm with a 10.5° angle.
Y760 42cc - 150lbs/89 Octane YA7642L
Y760 40cc - 165lbs/91 Octane YA7640L
Y760 38cc - 180lbs/98 Octane YA7638L
Y760 37cc - 187lbs/100 Octane YA7637L
Y760 36cc - 193lbs/105 Octane YA7636L
Y760 35cc - 200lbs/105 Octane YA7635L
Y760 33cc - 215lbs/110 Octane YA7633L
Y760 31cc - 230lbs/115 Octane YA7631L
Y760 29cc - 245lbs/116 Octane YA7629L

86mm Bore Flat Top Part No.
Billet dome has .015” squish relief @ 86mm with a 4° angle.
Y760 Flat Top Dome – 30cc YAK8630L15
Y760 Flat Top Dome – 28cc YAK8628L15
Y760 Flat Top Dome – 26cc YAK8626L15
Y760 Flat Top Dome – 24cc YAK8624L15
Y760 Flat Top Dome – 22cc YAK8622L15

Dome for Flat Top Kawasaki Piston@82mm 24cc KD1224

Y1100 - 81mm Bore Domes Part No.
Billet dome has .015” squish relief at 83mm with a 10.5° angle.
Y1100 37cc - 170lbs/92 Octane YA2137L
Y1100 35cc - 185lbs/92 Octane YA2135L
Y1100 34cc - 192lbs/95 Octane YA2134L
Y1100 33cc - 200lbs/105 Octane YA2133L
Y1100 31cc - 215lbs/112 Octane YA2131L
Y1100 29cc - 230lbs/115 Octane YA2129L

Y1200 - 84mm Bore Domes Part No.
Billet dome has .015” squish relief at 86mm with a 10.5° angle.
Y1200 42cc - 150lbs/91 Octane YA7642L
Y1200 40cc - 165lbs/91 Octane YA7640L
Y1200 38cc - 180lbs/98 Octane YA7638L
Y1200 37cc - 187lbs/100 Octane YA7637L
Y1200 36cc - 193lbs/105 Octane YA7636L
Y1200 35cc - 200lbs/105 Octane YA7635L
Y1200 33cc - 215lbs/110 Octane YA7633L
Y1200 31cc - 230lbs/115 Octane YA7631L
Y1200 29cc - 245lbs/118 Octane YA7629L

GP1200R - 81mm Bore Domes Part No.
Billet dome has .015” squish relief at 81mm with a 10.5° angle.
GP1200R 42cc - 140-145Lbs/89 Octane YA8042
GP1200R 40cc - 155-160Lbs/91 Octane YA8040
GP1200R 38cc - 165-170Lbs/95 Octane YA8038
GP1200R 35cc - 180-185Lbs/100 Octane YA8035
GP1200R 33cc - 195-200Lbs/105 Octane YA8033
GP1200R 31cc - 205-210Lbs/110 Octane YA8031
GP1200R 29cc - 215-220Lbs/115 Octane YA8029

Ships via UPS or USPS Priority.  All "Open Box" items are excluded from our free shipping offer and are not returnable.

International Customers: Shipping charges reflect transportation costs only and do not include international brokerage fees, duties, GST/HST/PST, or other applicable taxes. Customers outside the United States may receive a separate invoice directly from the carrier for these additional charges.

If your order arrives damaged or appears defective, please submit a claim through our Customer Service Order Damage Form. Our team will review your submission and contact you within 24 hours (excluding weekends and holidays). All damage/defect claims must be reported within 48 hours of delivery.

An RMA# (Return Merchandise Authorization Number) is required for all returns.

Returns must be initiated through your Customer Account Portal within 10 days of delivery.

Returned items must be:

• Unused
• Uninstalled
• Unmodified
• Complete with all original packaging, hardware, manuals, and accessories

Returns not related to damage, defect, or an Atlantic Jet Sports shipping error are subject to a 20% restocking fee. Customers are responsible for return shipping costs.

Unauthorized returns will be refused at our shipping dock.

[View Full Return Policy & Return Instructions]

Non‑Returnable Items

The following items are final sale and not eligible for return, exchange, or store credit:

• Seat Covers
• Mat Kits, Mat Sheets
• Chin Pads
• Waterboxes
• Aqua Cart & Factory Zero Transportation/Beach Dollies, Totes, Display Carts, and all related Parts/Accessories
• Watercraft Stands
• Aqua Performance Watercraft Steps
• RRP Handlepoles
• Special Order Items
• Close‑Out Items

Electrical Components (non‑returnable):
Starter Motors, Regulators, Relays, CDI Units, Ignition Coils, Stator Coils, Stator Assemblies, Fuel Injectors.

All warranties are those of the manufacturer and not Atlantic Jet Sports. We will be happy to assist you in filing a warranty claim with the manufacturer, but please remember that the manufacturer determines whether a claim is approved or denied. Any modification to a product voids your warranty. All claims for consequential, physical, incidental, or special damage are hereby excluded.

Performance Product Use & Compliance Notice

Atlantic Jet Sports supplies high‑performance components engineered solely for closed‑course racing and sanctioned competition. These parts are not designed, tested, certified, or warranted for use on public waterways or on watercraft equipped with emissions‑controlled systems.

Installing or using these components may change the watercraft’s safety characteristics, emissions compliance, or legal classification. Using competition‑only products on public waterways may violate federal, state, or local regulations.

By purchasing, installing, or operating a watercraft equipped with these components, the user acknowledges and accepts full responsibility for all associated risks—including, but not limited to, personal injury, property damage, mechanical failure, or legal consequences. The user further agrees that Atlantic Jet Sports assumes no liability for damages arising from improper installation, misuse, or operation outside of competition environments.

For best performance and safety, Atlantic Jet Sports strongly recommends installation by a qualified technician experienced with high‑performance Personal Watercraft systems.

Product Installation Disclaimer

⚠️ Warning — Professional Installation Required

• Ensure the hull is fully ventilated and free of fuel vapors before using electric or battery‑powered tools. Failure to do so may result in fire, explosion, serious injury, or death.
• Disconnect the battery before performing any installation or maintenance to prevent accidental ignition, electrical shock, or unintended engine engagement.
• Allow the engine, exhaust, and surrounding components to cool completely before beginning work.
• No smoking, open flames, or spark‑producing devices should be present during installation.

This product is not intended for use on watercraft equipped with pollution‑control systems. Modifying or removing emissions‑related components may violate state or local laws and may render the watercraft illegal for use outside of competition.