• 6 Bolt Cam Chain Tensioner Case Gasket. (Can use for 4 bolt type). OEM Ref.# 306-12213-01. Fits: 1970-84 650's.   Part #18-0860 $2.95 Ea.
  • Out of stock
    Cam Chain Tensioner Pivot Arm + mounting fasteners. OEM# Ref. 447-12220-00. Fits: XS/TX 650's 1974-84. Part #05-0004 $48.00 Ea.
  • Used 447 stock cam - 74-84 type. Can be used in engine or as a core for regrinding. Part #05-0077 $60.00 Ea.
  • Out of stock
    Grind 59a - Increased Torque thru entire RPM range. Easy bolt on power for the XS. Web Cam Grind 59a - Valve Lift .395 Duration 290 Degree, 1974-84 650 Yamaha. Use Cam with a performance Valve Spring Kit. Available for immediate delivery @ 199.00 Each Return a good Cam core and we refund you $50.00 - Why Wait ! ( Includes a $50.00 refundable core Charge ). Part #05-0027 $249.00 Ea.
  • Sale!
    Chromed Square Polished Valve Cover, 4 Hole Type. Part #24-2774 $15.95
  • Sale!
    Shim for Valve Spring Seat - Original part used on cylinder head under the valve spring. Steel shim must be in place on head (often missing!) 1pc. fits below each valve spring assembly. Four required per engine. Fits 70-84. Part #05-0028 $3.80 Ea.
  • Out of stock
    Big Bore Cylinder Head Gasket (750cc. - 82mm.). Fits: Our XS Performance #05-0750 Big Bore Kits for 1974-84 447 type engines. Part# 18-0750 $32.95
  • Sale!
    Big Bore (81mm.) 1st. Oversize Piston Kit - for 750 Engine Kit for Yamaha XS650's. One Forged Piston, 1 Ring set, 1 piston Pin, 1 set of rings for one piston. Features: Valve pockets cut for large valves, 2. Mos2 treated piston skirts. 3. Oil chanel for enhanced pin oiling. 3. 20mm.piston pins that are internally tapered for lighter weight. Piston weight approx 455 Grams. One Big Bore needs two Kits of Piston . Part #05-0753 $83.95 /Kit 
  • Sale!
    Big Bore Cylinder Block with cylinder sleeves installed and finished to fit 80mm. (79.94mm. (750cc. ) Note: Block only No pistons included. This cylinder is for those that have their own ( Hi-Compression ) pistons. Fits: 74-84 447/533 type engines. Cylinder casting has larger fins that extend out the same distance as the head fins for enhanced cooling. No modification needed to engine cases. Part#05-0759 $300.00
  • Clutch Pushrod (Short Outer Rod). Stock part for 1976-84 650's but will also work with 1970-75 parts. Part #39-6510 $6.95
  • Professional Adjustable Vise Grip Style Clutch Basket and Sprocket Holder Tool.   Part #35-9052 $14.95 Ea.
  • Sale!
    Piston Ring Set-2nd. Oversize-0.50mm. (for 1 Piston). OEM Ref.#447-11610-20. Fits: TX/XS650's 74-84 (447&533 type engines) Note: 447 type rings interchange with European 533 rings but pistons do not. 447 rings do not interchange with original 256 rings used on 1970-73 models. Part #05-0020 $25.20 Ea.
  • Sale!
    Piston 2nd. Oversize (0.50mm.) + Piston & Clips. OEM ref.#447-11636-02 Fits: 650's 1974-84  Note: Piston rings are not included in kit Part #05-0019 $45.46 Ea.
  • Sale!
    Piston 1st. Oversize (0.25mm.) +Piston Pin & Clips. OEM Ref.#447-11635-01. Fits: 650's 1974-84 Note: Piston rings are not included in kit Part #05-0017 $ 45.45 Ea.
  • Out of stock
    Clutch Friction Plate Fit: All 650's 1970-84 - Sold Each - Order number of pieces required. 1980-84 models - use 6pc. 1974-79 models - use 7pc.. 1970-73 model clutch friction plates are No longer available but these later types can replace the originals! (6 friction and 5 steel drive plates were originally used). To use these late type friction plates remove the old clutch plate separator O-Rings (discard), and add 1 additional steel drive plate and replace all 6 old type thick friction plates with 7pc. of this new type friction plate.   Part #39-1133 $6.29 Ea.
  • Out of stock
    5th. Overdrive Gear for Yamaha XS650 (1978-84). Heiden Tuning original design and source. Makes 5th. Gear taller ( higher top speed in 5th. but less torque and vibration ). 24 Tooth 5th. Pinion Gear. Replaces 23T 5th.Pinion Gear, lower 4 gears remain the same. Fits: 78-84 only ! Note : Yamaha changed the shape of the transmission teeth in 77 and this is indicated by a line on the crest of each gear tooth. This is a "Race" part and carries no warranty other than for defects in material. Engine needs to be opened to install.   Part #05-0870 $44.95 Ea.

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