Big Bore Oversize Piston Ring Set - 6th. Oversize - 1.50mm. (for 1 Piston). For use with Big Bore 6th. over piston. Quality Made in Japan on all new tooling. Fits: TX/XS650's 74-84 (447 type engines)

Cam Sprocket - 36 Tooth Replacement Sprocket for our 447 Type XS Performance Cam. Note: This sprocket does Not fit any other camshaft.

Shift Shaft Spring - Upper to Shift Selector Drum Arm. OEM Ref.# 90506-08007. Fits: All 650's 1970-84

Spring - Shift Selector Drum Detent Arm. OEM Ref.# 90506-10022. Fits: All 650's 1970-84

High Performance Oil Pump - Double the oil volume pumped by the stock unit! Easy direct bolt in kit. Ideal for performance engines or those operating in hot climates. Fits: 1972-84 650's

Oil Tube Base Fitting OEM# 256-13165-02

Replacement Spring for Cam Chain Tensioner on 1974-84 650's OEM Ref. # 90501-14095/341-12216-02

Piston Kit (3rd.oversize - 0.75mm.) Kit includes: Piston for one cylinder, one Piston Pin (22mm), 2 Piston Pin Clips and Rings for one piston. Piston uses high quality 447 type rings and kit can be used as a set Only. Japanese made superior quality. Fits: 256 Engines 1970-73 only!

Piston Pin - (22mm. Dia.), OEM Ref.# 256-11633-00, Made in Japan. Fits: 256 type pistons - XS1, XS1B, XS2, TX650 1970-73 Only!

Piston Pin Clips (Pk/2), OEM Ref.# 256-11634-00, Made in Japan. FIts: 256 Pistons - XS1, XS1B, XS2, TX650 1970-73 Only!

Cylinder Sleeve for Big Bore (750cc) 80mm. Pistons. Note: Stock cylinder sleeves must be removed and the cylinder block Must be bored to accept this larger sleeve and then the new sleeve must be bored to accept the new larger big bore pistons.

Stock 22 Tooth 5th. Main Gear (located on final output shaft). Replacement for original gear - OEM Ref. # 256-17251-04. 5th gear commonly wears out and the engagement dogs causing the transmission to slip out of 5th gear. Replace this gear if you have this problem (cases must be split to install). Fits: XS650's 1978-1984 Only! Note: Yamaha changed the shape of transmission gear teeth from 78 on and this is indicated by lines cut into the crest of each tooth.

Shock Absorber Set - (Monza Traditional) - Dual Progress - wound Chrome Springs & Long Black top shroud with black shock body. 13 3/16" (335mm) eye to eye. Includes preload wrench & set of eye rubbers. Fits: 1974-84 XS/TX650's

Shock Absorber Set - (Monza Traditional) - Dual Progress - wound Chrome Springs & Long Black top shroud with black shock body. 12 3/4" (324mm) eye to eye. Includes preload wrench & set of eye rubbers. Fits: 1974-84 XS/TX650's

Shock Absorber Set - (Monza Traditional) - Dual Progress - wound Chrome Springs & Long Black top shroud with black shock body. 11.5" (292mm) eye to eye. Includes preload wrench & set of eye rubbers. Fits: 1974-84 XS/TX650's