fits  84-91 Evo Big Twin (NU)

3-1/2″ bore. With 1.5mm (.060″) Blue PTFE coated paper cylinder head gaskets and 0.5mm (.020″) reinforced fiber cylinder base gaskets. Includes all required gaskets and seals for a top end rebuild. OEM replacement reference 17033-83, 17033-83A

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Home > Parts > Engine > Top End > Athena, top end gasket kit. Evo Big Twin

fits  84-91 Evo Big Twin (NU)

Includes silicone beaded paper rocker cover base gaskets, rubber rocker gaskets, and seals and O-rings required for rocker cover assembly. OEM replacement reference 17038-90.

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Home > Parts > Engine > Top End > Rocker Covers > Athena, rocker cover gasket & seal kit. Evo B.T.

fits  84-91 Evo Big Twin (NU)

Includes silicone beaded paper rocker base gaskets, cork rocker cover gaskets, seals and O-rings required for rocker cover assembly. OEM replacement reference 17038-90.

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Home > Parts > Gaskets > Gasket Kits > Rocker Cover > James, rocker cover gasket kit. Evo B.T. Cork

fits  84-91 Evo Big Twin (NU)

Includes silicone beaded paper rocker cover base gaskets, rubber rocker gaskets, and seals and O-rings required for rocker cover assembly. OEM replacement reference 17038-90.

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Home > Parts > Engine > Top End > Rocker Covers > Gaskets > James, rocker cover gasket kit. Evo B.T.

fits  84-91 Evo Big Twin (NU)

Includes RCM (Rubber Coated Metal) rocker base gaskets, rubber rocker cover gaskets and seals and orings required for rocker cover assembly. OEM replacement reference 17038-90.

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Home > Parts > Engine > Top End > Rocker Covers > Gaskets > James, rocker cover gasket kit. Evo B.T. RCM

fits  84-91 Evo Big Twin (NU)

Kit for two cylinders. EST’s embossed stainless steel metal substrate is coated with a proprietary high-temperature rubber material that virtually eliminates leakage when joining two metal surfaces. Rocker cover gaskets are .020″ thick and have .005″ of high temperature rubber on both sides. They will not weep, extrude, tear or become brittle over time. OEM replacement reference 17038-90.

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Home > Parts > Engine > Top End > Rocker Covers > Cometic, EST rocker cover gasket kit. Evo Big Twin

fits  84-91 Evo Big Twin (NU)

With standard 3.5″ bore MLS (Multi-Layer-Steel) .040″ thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020″ thick and have .001″ of high temperature viton rubber coating on both sides. Kit comes with all gaskets, seals and o-ring for a complete top end rebuild.

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Home > Parts > Gaskets > Gasket Kits > Top End > Cometic, EST top end gasket kit. Evo B.T.

fits  84-91 Evo Big Twin (NU)

S&S Superstock crankcases, made from 356-T6 aluminum, are much stronger than the OEM case. OEM cases can/may break in high performance or even stock applications, like more than a few of us found out the hard way. These S&S Superstock cases can be used for both stock replacement and racing applications. Important to the engine builder are the substantial savings in labor when using S&S cases. These cases come ‘set up’ with sprocket shaft Timken main bearing races and cam needle bearings installed and pinion shaft main bearing race pressed in and line-honed. Additional parts that are supplied include Timken sprocket shaft bearings, cylinder studs, nickel plated case bolts, crankcase fittings, oil pressure sensor, timing & magnetic crankcase drain plugs and a special S&S design alternator stator plug clamp screw. The flywheel scrapers are machined to match the original 8-1/2″ diameter flywheels. S&S cases maximize crankcase oil scavenging efficiency by using a ‘ported’ design breather passageway. S&S cases are clearanced up to and including 5″, no additional clearancing for strokers will be necessary. S&S cases come complete with assembly instructions. Note: For 84-E85 Evo Big Twin models you must use a L85-91 style cylinder head bolt kit. These can be ordered separately as MCS 505266 (Gardner-Westcott) or 989599 (Colony) in standard lengths only. Note: The aluminum H-D oil pump, (26190-73) or the S&S oil pump, MCS 519923, can be used in 70-91 applications. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components, prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required.

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Home > Parts > Engine > Lower End > Crankcases > S&S, 84-91 crankcase assembly, STD bore. Black

fits  84-91 Evo Big Twin (NU)

S&S Superstock crankcases, made from 356-T6 aluminum, are much stronger than the OEM case. OEM cases can/may break in high performance or even stock applications, like more than a few of us found out the hard way. These S&S Superstock cases can be used for both stock replacement and racing applications. Important to the engine builder are the substantial savings in labor when using S&S cases. These cases come ‘set up’ with sprocket shaft Timken main bearing races and cam needle bearings installed and pinion shaft main bearing race pressed in and line-honed. Additional parts that are supplied include Timken sprocket shaft bearings, cylinder studs, nickel plated case bolts, crankcase fittings, oil pressure sensor, timing & magnetic crankcase drain plugs and a special S&S design alternator stator plug clamp screw. The flywheel scrapers are machined to match the original 8-1/2″ diameter flywheels. S&S cases maximize crankcase oil scavenging efficiency by using a ‘ported’ design breather passageway. S&S cases are clearanced up to and including 5″, no additional clearancing for strokers will be necessary. S&S cases come complete with assembly instructions. Note: For 84-E85 Evo Big Twin models you must use a L85-91 style cylinder head bolt kit. These can be ordered separately as MCS 505266 (Gardner-Westcott) or 989599 (Colony) in standard lengths only. Note: The aluminum H-D oil pump, (26190-73) or the S&S oil pump, MCS 519923, can be used in 70-91 applications. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components, prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required.

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Home > Parts > Engine > Lower End > Crankcases > S&S, 84-91 crankcase assembly, STD bore. Natural