1978 YAMAHA YZ400 Parts & Accessories

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Displaying parts for your 1978 YAMAHA YZ400

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See stock sizes for this machine

  • Front Tire:3.00x21
  • Rear Tire:4.50x18
  • Front Sprocket:14 Tooth
  • Rear Sprocket:50 Tooth
  • Chain:520x106
  • Spark Plug:B8EG
For reference only. Please consult your owner's manual to confirm manufacturer specs.
NGK Iridium Sparkplug$9.99
Rated 4.88 out of five stars.★★★★★
Tusk 520 Gold X-Ring Chain$4.99 – $70.99
Rated 4.60 out of five stars.★★★★⯪
Tusk Tach/Hour Meter$22.99
Rated 4.61 out of five stars.★★★★⯪
Tusk 520 O-Ring Chain$4.99 – $50.99
Rated 4.80 out of five stars.★★★★★
Tusk Wheel Bearing and Seal Kit$9.99
Rated 4.59 out of five stars.★★★★⯪
All Balls Wheel Bearing Kit$14.56
Rated 4.51 out of five stars.★★★★⯪
NGK G-Rated Sparkplug$5.99
Rated 4.87 out of five stars.★★★★★
Primary Drive 520 ORH Gold X-Ring Chain$4.99 – $69.99
Rated 4.66 out of five stars.★★★★★
Tusk Magnetic Drain Bolt$8.99
Rated 4.72 out of five stars.★★★★★
Tusk T-10 Aluminum 7/8" Handlebar$37.99
Rated 4.43 out of five stars.★★★★⯪
Primary Drive 520 ORM O-Ring Chain$4.99 – $49.99
Rated 4.77 out of five stars.★★★★★
Tusk Aluminum Tire Iron with Axle Wrench$16.99
Rated 4.65 out of five stars.★★★★⯪
ProTaper SE 7/8" Handlebar$74.95 – $74.99
Rated 4.79 out of five stars.★★★★★
Motion Pro Clutch Lever$12.59
Rated 4.58 out of five stars.★★★★⯪
DID 520 Chain$3.95 – $47.77
Rated 4.13 out of five stars.★★★★☆
Tusk Low-Profile Magnetic Drain Bolt$8.99
Rated 4.61 out of five stars.★★★★⯪
RK 520 Chain$28.88
Rated 4.26 out of five stars.★★★★☆
Tusk Skid Plate Foam$10.95 – $11.95
Rated 4.56 out of five stars.★★★★⯪
Primary Drive 520 ORH X-Ring Chain$4.99 – $62.99
Rated 4.64 out of five stars.★★★★⯪
Tusk Universal Big Bar Clamp and Bar Kit$72.99 – $190.89
Rated 4.50 out of five stars.★★★★⯪
Motion Pro Flywheel Puller$18.69
Rated 4.85 out of five stars.★★★★★
Renthal Aluminum 7/8" Handlebar$94.88 – $104.88
Rated 4.84 out of five stars.★★★★★
Tusk Universal Big Bar Clamp Kit$29.99
Rated 4.65 out of five stars.★★★★⯪
Race Tech Fork Seals$69.99
Rated 4.72 out of five stars.★★★★★
Rox Speed FX 2" Handlebar Risers$79.88 – $89.88
Rated 4.83 out of five stars.★★★★★
Tusk Piston Ring Compressor$22.99
Rated 5.00 out of five stars.★★★★★
K & L Fork Seals$12.09
Rated 4.65 out of five stars.★★★★⯪
Odi Podium 7/8" Handlebars$76.46
Rated 5.00 out of five stars.★★★★★
RK 520EXW Gold XW-RING Chain$8.06
Rated 4.79 out of five stars.★★★★★
Mika Metals 7/8" Handlebars$86.88 – $89.99
Rated 4.18 out of five stars.★★★★☆
Wiseco Piston Replacement Circlip$2.99
Rated 4.86 out of five stars.★★★★★
Rox Speed FX Pro-Offset Elite Block Risers$85.88
Rated 4.81 out of five stars.★★★★★
Tusk Float Bowl Wrench$6.99
Rated 4.84 out of five stars.★★★★★
Mylers High Pressure Radiator Cap$17.99
Rated 4.77 out of five stars.★★★★★
P3 Carbon Skid Plate Foam$12.95
Rated 4.53 out of five stars.★★★★⯪
IMS Flightline Folding Shift Lever$54.55
Rated 4.49 out of five stars.★★★★⯪
Motion Pro Pro Plug Socket$31.89
Rated 4.80 out of five stars.★★★★★
RK 520EXW XW-RING Chain$8.95
Rated 4.68 out of five stars.★★★★★
Motion Pro T-6 Combo Lever$39.99
Rated 4.88 out of five stars.★★★★★
Moose Racing Magnetic Drain Plug$18.95
Rated 4.73 out of five stars.★★★★★
Klutchbox Original Bar Pad$64.95
Rated 5.00 out of five stars.★★★★★
Rox Speed FX 3 1/2" Pivoting Handlebar Risers$95.88
Rated 5.00 out of five stars.★★★★★
Mika Metals Pro Series Hybrid 7/8" Oversized Handlebars without Bar Pad$109.88
Mika Metals Pro Series Hybrid 7/8" Oversized Handlebars$119.88
Rated 5.00 out of five stars.★★★★★
Tusk Piston Replacement Circlip$1.79
Mika Metals 7/8" Handlebars without Bar Pad$86.99
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