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    Big Bore cylinder and piston kit- The only complete bolt on big bore 750cc Big Bore Cylinder and Piston Kit The Only complete bolt-on Big Bore 750cc Cylinder and piston kit ever made for the XS650 Yamaha Modified limited production European Race Engine Cylinder Block has enlarged fins for improved cooling. The New Cylinder Block has longer fins matching the Head Fin Length. Kit Fits: 1974-84 447 Type Engines Kit Includes: 1. XS Performance Big Bore Race Cylinder Block with sleeves installed and finished to fit our 80mm. Forged Big Bore (750cc.) Pistons. Cylinder casting has larger cooling fins that extend out the same distance as the cylinder head fins for enhanced cooling. No modifications to engine cases needed. 2. Forged 80mm. 750cc Big Bore Piston kits(2) complete with Ring Sets, Piston Pins & Clips. Forged 447 type Pistons feature: 1. Valve pockets cut for large valves. 2. Mos2 treated piston skirts. 3. Oil channel for enhanced piston pin oiling. 4. 20mm. piston pins that are internally tapered to ends for weight reduction. 5. Lightweight 9:1 compression pistons. Assembly - Weight approx. 455 Grams. 6. Big Bore Cylinder Head Gasket & Base Gasket. Fitted with our XS Performance Camshaft, Dellorto Carbs, a free-flowing Exhaust and Iridium spark plugs will result in about 65 Rear wheel Horsepower or more and 50 foot-pounds of Torque. See Dyno Chart 1 Dyno Part #05-0750 $350.00 Ea.
  • Sump Oil Filter Strainer Plate Gasket. Fits: All 650's 1970-84. Part #18-0858 $3.80
  • Out of stock
    Headpipe Exhaust Gaskets (Pk./2) - Original Yamaha Type. OEM Ref.# 256/3GD-14613-00, 90430-38054. Fits: All 650's 1970-84.   Part #18-0675 $2.95 Pk./2
  • Chrome Rocker Shaft Plug, OEM Reference #90430-18017-00, 256-11177-00-00, 90340-18017-00. Part #49-0710 $1.75
  • Drain Plug Crush Gaskets - (Pk./2) - Each Engine has 2 Drain Plugs. Replaces OEM# 256-15353-00. Part #17-3802 $3.50 Pk./2
  • Right Hand Crank Case Cover (Clutch) Gasket. OEM Ref.# 256-15451-00. Fits: 1970-84 650's. Part #18-0864 $8.90
  • Sump Oil Filter - (New and Upgraded design with perforated metal to back up the filtering element). Stock original filters tear at low milage and allow unfiltered oil to flow to the oil pump. OEM Ref.# 256-13411-01. Fits: All 650's 1970-84. Part #15-6500 $24.95
  • Tsubaki BF05M Rivet Master Link Pitch .3061" (7.774mm.). Cam Chain Replacement Link Fits: XS650 ,TX650 (74-84 ) Replaces OEM# 94500-02106-00. Part #01-8815 $3.00 Ea.
  • Oil Dipstick Gasket. OEM Ref.# 256-15364-00.

    Fits: All 650's 1970-84

    Part #18-0866 $1.90
  • Clutch Spring Screw - Sold Each. 6 Pieces used per engine. Order what you need. Fits: All 1970-84 XS/TX650's. Part #39-6508 $3.95
  • 56pc. Kit Contains: 3 Hole Tappet Cover chromed Crown Nuts (9pc.) with matching chrome Washers (9pc.) + Cylinder Head chrome Crown Nut (8pc.) + chrome rocker shaft End Plug (4pc.) + Point/Cam Cover chrome Screws (4pc.) + Exhaust Stud chrome Crown Nuts (4pc.) with matching Stainless Lock Washers (4pc.) + 2pc. Chrome Oil tube banjo bolts, + 2pc. Chromed Cylinder front/Cam chain guide bar Nuts, + 2pc. chromed cam chain guide bar bolts+ 4 hole rocker cover nuts & washers. Fits: 1972-84 650's.   Part #49-0653 $35.95/Set
  • Intake Spiggot Gasket (Pk./2) Intake Spiggot Gasket (Carb Holder Rubber) (Pk./2), OEM Ref.# 256-13556-01. Fits: Between XS650 Manifolds (Carb Spacers) and cylinder head and between the XS manifolds and the carb holders for the PWK 32. Fits: 1970-84 650's Keihin Flatslide PWK 32mm XS Performance Carb Set for XS650. And All Stock Carb Holders. Note: 2 sets required. Part #18-0865 $4.90/Pk./2
  • Nut - Late Cam Chain Adjuster - 22 x 11.5mm. thick. Fits to 18mm. x M1.5 threaded shaft. OEM Ref.# 90179-18274-00 Fits: 1980-84 XS650 2F/G/SG/H/SH/SJ/SK/SL ( Note: 76-79 models did not use a lock nut ) Part #05-0052 $4.00 Ea.
  • Stock Oil Filter Screen - Fits in RH Engine Side Cover (Clutch Side) - Made in Japan - OEM Ref.# 256-13441-00. Fits: All 1970-84 XS/TX650's. Part #15-6501 $9.95
  • Needle Bearing with Thrust Washer for Rear of Inner Clutch Hub. Fits: All 650's If your clutch does not seem to release properly or if you have difficulty finding neutral when the engine is hot a worn bearing may be the reason. Our high quality multi-needle bearing assembly is a superior replacement for the original. Note: Bearing Part #39-6505 (OEM Ref.#93341-23504) consists of - 1. the circular bearing race and 2. one thin matching washer. Parts books and manuals show this as 1 part only (not 2 pc). The Clutch must be assembled in Sequence shown above - Bearing with its matching thin washer and then the thick clutch washer (thrust plate). Part #39-6505 $12.95
  • Engine Crankshaft Oil Seal on Alternator (LH) side. OEM.# 93102-25121/25090. Ars SD 25-40 9-L-1 HS Fits: All 650's 1970-84.   Part #01-9025 $7.50 Ea.
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