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    2. Parts
    3. Engine

    1999 Yamaha WR400F Engine

    1999 Yamaha WR400F
    Tire Size:
    Front: 80/100-21, Rear: 110/100-18
    Spark Plug:
    CR8E
    Stock Chain/Belt:
    520x114
    Stock Gearing:
    Front: 14T, Rear: 50T
    Oil Filter:
    KN-142
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    Wiseco
    Pro Lite Piston Kit
    $216.95
    $193.99
    You save $22.96 (11%)
    (12)
    Wiseco Pro Lite Piston Kit Available for both two stroke and four stroke bikes, the Wiseco Pro Lite Piston Kit is both a great OEM alternative and an easy way to boost the power. Choose stock bore siz
    Moose Racing Top End Gasket Kit Performance sets designed for a piston replacement Top-end gasket sets include high-performance head, base, intake and exhaust gaskets Cost-effective way to raise c
    Hot Cams Valve Shim Kit Sick of taking your bike to an expensive mechanic to have them shim your valves just because you don't have the correct shims to do it yourself? Here is the answer, Hot Cams
    Athena Complete Gasket Kit Manufactured in "State-of-the-Art" computer controlled facilities All gaskets made from the highest quality materials All gasket sets meet or exceed OEM specifications The
    Moose Racing Complete Gasket Set All gaskets needed for engine rebuild are included in each set with the exception of oil seals Unmatched reliability and performance from high-tech materials Design
    Factory Effex
    Engine Plug Kit
    $74.95
    $56.99
    You save $17.96 (24%)
    (2)
    Factory Effex Engine Plug Kit Blended 6061 Aluminum Precision CNC machined fit and finish Type 3 anodizing finish Laser engraved graphics
    Moose Racing Magnetic Oil Filter CoverMagnetic Oil Filter Cover by Moose Racing Add more than a factory look to your 4-stroke Sturdy CNC'd billet oil filter cover; anodized bright red Ultra powerful r
    Cometic
    Top End Gasket Kit
    $36.95
    $33.99
    You save $2.96 (8%)
    (0)
    Cometic Top End Gasket Kit Cometic Hi-Performance Non-Asbestos Gasket Kits are made from the highest quality, non-asbestos gasket material available Cometic Manifold and Base Gaskets are mad
    Works Connection Engine Plug 6061 T-6 Aluminum with an anodized finish and O-ring seal Machined from billet aluminum, these new plugs are guaranteed to add a "Factory" look to your bike Available in
    Works Connection Oil Filler Plug 6061 T-6 Aluminum with an anodized finish and O-ring seal Adds nice factory look Made in the USA **Note: Honda CRF450R models must order one for crankcase and one fo
    Hammerhead Designs Oil Filler Plug6061 T-6 Machined Billet Aluminum with an anodized finish and O-ring seal Laser etched Logo adds a nice factory look All models are plug only (No Dipstick) unless n
    Moose Racing Countershaft Seal Kit Kit includes hardened steel bushing, an upgraded seal, an O-ring (where applicable) and a snap ring or lock washer (where applicable) Made in the U.S.A.
    Wiseco
    Cam Chain
    $67.95
    $61.09
    You save $6.86 (10%)
    (0)
    Wiseco Cam Chain Made from premium materials to reduce friction and increase service life “M” style chain gives you maximum strength and durability Wiseco’s in-house
    Pro X Racing Parts
    Engine Valve
    $18.29 - $24.95
    $18.29 - $24.69
    You save up to $0.26 (1%)
    (0)
    Pro X Racing Parts Engine Valve ProX also offers a complete line of steel valves. The ProX steel valves are manufactured of premium grade steel to exact OEM specifications and tolerances. The ProX val
    Hot Cams
    Stage 1 Cam
    $179.95 - $199.95
    (0)
    Hot Cams Stage 1 Cam Extract maximum performance from your engine Hot Cams provide increased intake and exhaust duration for improved breathability and more horsepower Provides significantly more mid
    Wiseco
    Stainless Steel Engine Valves
    $10.39 - $15.49
    $9.39 - $13.99
    You save up to $1.50 (10%)
    (1)
    Wiseco Stainless Steel Engine Valves Stainless steel valves are manufactured to exacting tolerances from the highest grade material Forged one piece valves for unmatched strength CVD/CNI coated t

    Latest Reviews

    Jake (Colchester, CT)

    Fit
    Quality
    Installation
    Recommend

    Was good...

    Fit great and was an easy installation but blew it first time I took it to the track.

    Davey (South Central, WI)

    Fit
    Quality
    Installation
    Recommend

    Great Deal

    2008 FZ1- Fit perfectly, no 'big glob of glue' on the end holding the magnet in. Nice black finish, we'll see if it holds up. Same exact length as stock. I'm actually kind of excited to see what it pulls out of the oil at the next interval. Cheap insurance, money well spent!

    Sean (Los Angeles, CA)

    Fit
    Quality
    Installation
    Recommend

    Replaced the top end on my 96 cr125r! Fit great perform well but the price is the problem. For 70-80 bucks they'd be perfect!

    Mike (Concord, NC)

    Fit
    Quality
    Installation
    Recommend

    Hammerhead Engine Plugs

    These fit perfect, and look great on the bike!! They do not come with O rings so you will have to use your oem ones or buy new ones but they are only a couple bucks- definitely worth the money.

    J (LI, NY)

    Fit
    Quality
    Installation
    Recommend

    125cc kit

    I had this athena kit on my 2003 yz125 and the bike ripped. Probably was the fastest 125 Ive owned and it ran stock exhaust only other engine mod was vforce reed. I called it the blue demon :p

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