Piston Pin for our XS Performance forged Big Bore 750cc Pistons. 20mm. piston pin is internally tapered to ends to reduce weight. Fits: 1974-84 447/533 XS Performance 80-81mm. Forged pistons.

Piston Pin Clips (Pr.) to fit our Big Bore (750cc) forged pistons and Big Bore Kits. 20mm. size for 447/533 (1974-84) type engines only.

ALL NEW PARTS! The ultimate complete bolt on Big Bore 750cc Cylinder and piston kit made for the XS650 Yamaha. Kit Fits: 1974-84 447 Type Engines NOT COMPATIBLE WITH EUROPEAN 533 OR EARLY MODEL 256 ENGINES 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 Includes: One of our 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. Two 80mm, 750cc Big Bore Piston kits complete with Ring Sets, Piston Pins & Clips. Precision machined 447 type Pistons feature: Valve pockets cut for large valves. Oil channel for enhanced piston pin oiling. 20mm. piston pins that are internally tapered to ends for weight reduction. 9:1 compression pistons. Fitted with our XS Performance Camshaft, 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.

Dowel Pins for Cylinder Head or Base - 14mm. OD x 16mm. Long. Fits: All 650's 1970-84

Stock 650cc Cylinder Sleeve. Replaces damaged or worn out original sleeve so engine can go back to stock piston size (approx. 74.94MM. or 2.95" ) or any of it's oversizes. ID, OD, length and thickness dimensions are the same as original. Fits: All 1970-84 stock cylinder blocks. Note: After installation of sleeve into your cylinder, sleeve must be sized (bored/honed) to accept the pistons you are using. This operation should be performed by a competent professional machine shop.

Kickstarter Lever Assembly with Chrome plated Lever Shaft Later Heavy Duty type Kickstarter with rubber (swings out further for more clearance from arm to brake pedal and exhaust). Fits: All 650 Engines 1974-84

Engine Crankcase Bolts (Set/4). Bolts fasten engine cases together and pass thru cases from the top of the rear portion of the engine. We have replicated the early type attractive Chrome plated Domed head type Bolts and have the 3 sizes in a set of 4. Fits: All 650's 1970-84

Starter Motor Shaft Oil Seal OEM # 93101-17047-00 SDO 17-28-8 HS

4pc. Transmission Bearing Set (Sold as a Set/4 Only). Kit Contains: 1. Countershaft (sprocket End) B5206 Special Dual row Ball Bearing # 93305-20602 2. Countershaft Cylindrical Needle Bearing - OEM Ref.# 93313-32005 3. Mainshaft Double row Ball bearing B5205 - OEM REf.# 93305-20504 4. Mainshaft Cylindrical Needle Bearing - OEM Ref.# 93313-32007 Fits: All 650's 1970-84

XS Performance Polished Stainless Steel Exhaust Valve. Replaces OEM #341-12121-01 Fits: All 650's 1970-84 Collets Sold Separate

XS Performance Polished Stainless Steel Intake Valve. Replaces OEM #341-12111-02. Fits: All 650's 1970-84 Collets Sold Separate

Exhaust Studs for Cylinder Head - 10mm. x M1.25 x 43mm. Long with Plated Finish.

Cylinder Head Stud for 4 Hole Tappet Cover - 8mm. x M1.25 x 30mm with Plated Finish. Fits Cylinder Head 4 hole Tappet covers on all 1972-84 650's.

Cylinder Head Stud for 3 Hole Tappet Cover - 6mm. x M1.0 x 30mm with Plated Finish. Fits Cylinder Head 3 hole Tappet covers on all 1970-84 650's.

Cam Chain Adjuster Cap as used on XS650C/D/E/F/G/H/SE/SF/2F/SG/SH 1976-81 Will also replace 82-84 type. OEM Ref. # 90176-18021-00