Products

BC4900 - Polaris XP1000/XPTurbo Main Bearings (oversize)

New King main bearings for the Polaris RZR platform are now available. The BC 4340 billet XP cra...

New King main bearings for the Polaris RZR platform are now available. The BC 4340 billet XP crankshafts are an improvement to the rod bearing failures but they aren’t the cure for the oiling issues. These exclusive mains from King Bearing however do provide the proper oiling from the mains to the rods with some qualified machining. King XP line bearings are a hardened coated race bearing vs the OE soft Babbitt bearing. To thoroughly “bulletproof” the case, we designed an oversize O.D. (1.75...

BC4910C - Customer supplied Polaris XPTurbo or XP1000 Crankcase w/Linebore, Shuffle Pin, A...

CUSTOMER SUPPLIED CRANKCASE - This is the hot setup for any Polaris RZR build (XPT and XP1000), ...

CUSTOMER SUPPLIED CRANKCASE - This is the hot setup for any Polaris RZR build (XPT and XP1000), especially big horsepower (over 250whp), endurance racing or anyone who's had rod or crank failure and are searching for more reliability out of their RZR engine.  You supply the crankcase (new cases available, use BC4910N) for lineboring, shuffle pinning, King main bearings and ARP2000 main studs.  The BC 4340 billet XP crankshafts are an improvement to the rod bearing failures but they aren...

BC4912C - Customer supplied Can-Am Crankcase w/Darton Dry Sleeves, O-Ring, Specify Bore

CUSTOMER SUPPLIED CRANKCASE - Customer supplied Can-Am/Rotax 900 ACE case with Darton dry sleeve...

CUSTOMER SUPPLIED CRANKCASE - Customer supplied Can-Am/Rotax 900 ACE case with Darton dry sleeve install. Choose from 74 or 75mm bore sizes, includes copper O-Rings to contain combustion and ARP2000 main studs. Upper case half is also linebored to lower girdle half to true up case castings for optimum oiling. Features include: Darton sleeve install with step deck. CNC finish hone to desired bore size. Copper O-Ring case to contain combustion. ARP2000 9mm main studs installed and torqued. Ca...

BC8278 - Polaris XP Turbo / Turbo S / XP 1000 / RS1 Cometic Engine Accessory Gasket Kit

Complete Cometic engine gasket and seal accessory kit for Polaris XPTurbo, Turbo-S, XP1000 and RS...

Complete Cometic engine gasket and seal accessory kit for Polaris XPTurbo, Turbo-S, XP1000 and RS1 applications. $375 worth of OE Polaris parts for $240. Includes: Oil Filter Adapter Seal - 3610318 Crank Seal - 3610284 Oil Cooler O-Rings - 5413837 x 2 Breather Block Seal - 5813759 Chain Tensioner Gasket (17-up) - 5814561 Chain Tensioner Gasket (2016) - 5813449 Water Inlet Seal - 5813736 Oil Pump Pickup Seal - 5415949 Mag Cover Gasket - 5814160 Thermostat Housing O-Ring - 5414591 Thermostat Se...

BC8287 - Polaris RZR Pro-R (93.5mm x .088”) Cometic Head Gasket

93.5mm cyl bore, .088” Thickness - Cometic 5 layer gaskets for the RZR Pro-R 4 cylinder combine a...

93.5mm cyl bore, .088” Thickness - Cometic 5 layer gaskets for the RZR Pro-R 4 cylinder 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 an...

BC8289 - Polaris RZR Pro-R (93.5mm x .052”) Cometic Head Gasket

93.5mm cyl bore, .052” Thickness - Cometic 5 layer gaskets for the RZR Pro-R 4 cylinder combine a...

93.5mm cyl bore, .052” Thickness - Cometic 5 layer gaskets for the RZR Pro-R 4 cylinder 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 an...

BC8290-2 - Polaris XP Turbo / XP 1000 (93/94mm x .052”) Cometic MLX Head Gasket

MLX design for non O-ringed cylinder jug fits 93mm or 94mm bore, .052” Thickness - Cometic three ...

MLX design for non O-ringed cylinder jug fits 93mm or 94mm bore, .052” Thickness - Cometic three layer 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 pr...

BC8291-3 - Polaris XP Turbo / XP 1000 (93mm x .051”) Cometic MLS Head Gasket

MLS for O-ring cylinder jug, 93mm Bore only, .051” Thickness - Cometic three layer gaskets combin...

MLS for O-ring cylinder jug, 93mm Bore only, .051” Thickness - Cometic three layer 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 MLS 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...

BC8292-1 - Honda Talon 1000 (92-93mm x .023”) Cometic Head Gasket

92-93mm cyl bore, .023” Thickness - Cometic three layer gaskets combine advanced materials with s...

92-93mm cyl bore, .023” Thickness - Cometic three layer 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 MLS 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.

BC8293 - Can-Am X3 (74-75mm x .051”) MLS Cometic Head Gasket

MLS style for O-ring head. 74mm or 75mm cyl bore, .051” Thickness - Cometic three layer gaskets ...

MLS style for O-ring head. 74mm or 75mm cyl bore, .051” Thickness - Cometic three layer 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 MLS 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 arou...

BC8294 - Can-Am X3 (74-75mm x .028”) MLX Cometic Head Gasket

MLX style for non O-ring head. 74mm or 75mm cyl bore, .028” Thickness - Cometic three layer gask...

MLX style for non O-ring head. 74mm or 75mm cyl bore, .028” Thickness - Cometic three layer 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 ...

BC8295 - Can-Am X3 MLX for non-O-Ring Case (74-76mm) x .036” for 7/16” head studs Cometic ...

74mm, 75mm, or 76mm cyl bore, .036” Thickness and designed with 7/16” head stud holes - Cometic ...

74mm, 75mm, or 76mm cyl bore, .036” Thickness and designed with 7/16” head stud holes - Cometic three layer 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 fo...

BC8298 - Yamaha YXZ/998 (80mm x .028”) Cometic Head Gasket

80mm cyl bore, .028” Thickness - Cometic three layer gaskets combine advanced materials with stat...

80mm cyl bore, .028” Thickness - Cometic three layer 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 MLS 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.

BC9090 - Polaris RZR XPT Cylinder Jug - 93mm Bore w/O-Rings

  BC offers stock bore XPTurbo cylinder jugs that have been hopped up with copper o-rings. We cho...

  BC offers stock bore XPTurbo cylinder jugs that have been hopped up with copper o-rings. We choose the XPT cylinders because of the closed deck design and the fact that they're +.050" taller deck height. This adds rigidity and support to the cylinders as well as delivering less piston side loading with an optimal compression height design piston.

BC9911 - Polaris XP Turbo CNC Cylinder Head - Big Port 38.8mm/33mm Valves

Use pulldowns above to build out your head. The BC core exchange program works three ways: 1) Buy...

Use pulldowns above to build out your head. 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. Check with BC for availability. 3) Send a used head in, receive that same head back + $150 for complete inspection prior to machine work. BC only accepts new, never-been ran Polaris XPTurbo (#3023773) or XP1000 (#3022716) cylinder heads as new core exchanges as they are virtual...

BC9920 - Honda Talon 1000 CNC Cylinder Head - Small Port 36.5mm/31mm Valves

Use pulldowns above to build out your head. The BC core exchange program works three ways: 1) Bu...

Use pulldowns above to build out your head. 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. Check with BC for availability. 3) Send a used head in, receive that same head back + $150 for complete inspection prior to machine work. BC only accepts new, never-been ran Honda heads (#12010-HL6-A00) cylinder heads as new core exchanges. BC uses only new heads for all new e...

BC9930 - Can-Am X3 CNC Cylinder Head - Small Port 29mm/25mm Valves

Use pulldowns above to build out your head. The BC core exchange program works three ways: 1) Bu...

Use pulldowns above to build out your head. 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. Check with BC for availability. 3) Send a used head in, receive that same head back + $150 for complete inspection prior to machine work. BC only accepts new, never-been ran Can-Am X3 (#420413362) cylinder heads as new core exchanges. BC uses only new heads for all new even ex...

BC9950 - Yamaha YXZ/998 NEW CNC Cylinder Head - Small Port 31mm/26mm Valves

Use pulldowns above to build out your head. The BC core exchange program works three ways: 1) Bu...

Use pulldowns above to build out your head. 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. Check with BC for availability. 3) Send a used head in, receive that same head back + $150 for complete inspection prior to machine work. BC only accepts new, never-been ran Yamaha heads (#2HC-11101-09-00) cylinder heads as new core exchanges. BC uses only new heads for all ne...

TPR006 - TPR XPTurbo/XP1000 Crankcase Breather Kit

RZR XP1000 and XPT motors are notorious for excessive crank case pressure, the factory breather ...

RZR XP1000 and XPT motors are notorious for excessive crank case pressure, the factory breather system recirculates crank case blow by back into the intake system from a breather box on the lower front side of the engine case.   The main problem with this design is how close the breather box is to the oil pan allowing oil to be carried out with the crankcase blow by and then put into your intake charge and burned. XPT models are known for rod bearing failures due a number of issues, one bein...