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YYAMAHA YXZ / 998 HEADS / CASES

There’s big horsepower gains to be made from proper head porting and BC offers CNC ported cylinder heads that are IN STOCK and ready to ship for immediate delivery for the Yamaha YXZ / 998 applications. These heads deliver the best flow characteristics in terms of strength, direction and condition of the air/fuel charge as it enters the cylinder through the intake valve. If you have exceptional charge motion, the cylinder will continue to fill even after the piston hits bottom dead center (BDC) and the air/fuel charge will evenly disperse in the chamber. All of this working cohesively makes horsepower. Each head design has seen extensive R&D, thousands of miles of testing, both on the dyno and out in the field in order to determine the absolute best performing combination of parts that also delivers unprecedented reliability. If stock bottom end or stock stroke crank with stock or Stage 2 cams, we recommend the small valve setup (STD stainless steel intake / STD Inconel exhaust). If running a stroker kit or full race application, recommend the big valve setup (STD SS intake / +1mm Inconel exhaust) for added flow and performance. Then it's alacarte on the remaining valve train. Choose from the BC dual valve springs wound by PAC, featuring extra processing procedures for enhanced durability, steel retainers, keepers, BC camshafts (new cores...not regrinds!) and the ARP head studs are all available as add-ons.

Heads are available fully loaded and lashed with the optional BC parts for an added assembly fee of $200.

The BC core exchange program works three ways:

  1. Buy one of BC's new heads outright, no exchange.
  2. Send a new head in for even exchange for one of BC's new "in-stock" heads.
  3. Send a used head in, receive that same head back.

BC only accepts new, never-been ran Yamaha YXZ (#2HC-11101-09-00) cylinder heads as new core exchanges. BC uses only new heads for all new even exchanges. All heads come with BC bronze valve guides installed as well as STD Stainless Steel intake & STD or +1mm Inconel exhaust valves. Any valve springs, retainers, keepers, cams or ARP head studs are sold separately in the pulldown menus.

If sending a new head, allow 1 week for inspection before new CNC head ships. If sending a used head, allow 4-8 weeks for that head to be ported. No exchanges on used heads. Send heads for servicing here:

BrianCrower, Inc, 161 So Marshall Ave, El Cajon CA 92020

Part # Description # Buy Kit Status
BC9950 CNC PORTED CYLINDER HEAD w/GUIDES AND VALVES INSTALLED (31mm/26mm). NO CORE EXCHANGE - All other parts sold separately. In-Stock
BC9951 CNC PORTED CYLINDER HEAD w/GUIDES AND VALVES INSTALLED (31mm/27mm). NO CORE EXCHANGE - All other parts sold separately. In-Stock
Note: The above cylinder head packages come without camshafts, buckets, springs, retainers and keepers installed. If you want full assembly, $200 additional.

Stainless steel intakes and Inconel exhaust valves in 31mm Int / 26mm Exh or +1mm Exh (27mm).

CNC combustion chambers for valve un-shrouding, optimum flame travel and equal chamber volume.
Full CNC intake runner with standrad diameter stainless steel valve for big CFM gains at .360" lift.
Full CNC exhaust runner with +1mm oversize Inconel valve for an increase of 35CFM @ .350” lift.

YAMAHA 998 HEAD GASKETS
Cometic gaskets combine advanced materials with state-of-the-art manufacturing processes to provide custom-tailored solutions to meet the needs of each individual application. The MLX head gasket is comprised of a three layer setup - Viton coated embossed spring steel outer layers surround a steel inner layer that provides support and thickness to the gasket. Embossments on the gasket allow for a proper seal around oil and water passages.
Part # Description # Thickness Buy Now Status
BC8298 GASKETS - Cometic (Yamaha 998) - MLS 3 Layer, .028" Thickness, 80mm bore .028" In-Stock
BC8297 GASKETS - Cometic (Yamaha 998) - MLS 3 Layer, .052" Thickness, 80mm bore .052" In-Stock
BC8299 GASKETS - Cometic (Yamaha 998) - MLS 3 Layer, .027" Thickness, 82-83mm bore .027" In-Stock
619.749.9018 ph
619.749.9128 fx
Some products listed are not legal for sale or use on emission controlled motor vehicles, RPM ranges vary on application.Warranty Information Copyright © Brian Crower Inc. All rights reserved..
WARNING: This product can expose you to chemicals, including Chromium (hexavalent compounds), lead and lead compounds, which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit www.p65warnings.ca.gov