1983-1988 Genuine Yamaha Enticer/Excell III 340 Series Snowmobile Service Manual, Page 96Get this manual
APPENDIX 7-1SPECIFICATIONS
General
Model Model: Model (I.B.MNo Frame I.D& starting number Engine ID& starting number Dimension: Overall length Overall width (std) Overall height (wwindshield) EC340G 8T7 8T7-121101 E388-121101 2,555 mm (100.6 in) 970 mm (38.2 in) 1,040 mm (40.9 in) ET340TG 8T9 8T9-111101 E388-111101 2,895 mm (114 in) 940 mm (37 in) 1,090 mm (42.9 in)
Model Description: Engine type Engine model Displacement Bore stroke Effective compression ratio Starting system Ignition system Lubrication system Cylinder head: Combustion chamber volume (with spark plug) Compression chamber type Head gasket thickness Cylinder: Material Bore size Taper limit Out of round limit Piston: Piston skirt clearance (Measuring point) EC340G Fan cooled two-stroke 5-port, twin cylinders E338 338 cm (20.6 cu.in) 60 59.6 mm (2.36 2.35 in) 6.5: Recoil hand starter and electric starter C.D.I"Autolube" oil inspection 21.3 cm (1.30 cu.in) DomeSqu ish 0.5 mm (0.02 in) Cast iron sleeves aluminum 60 mm (2.362 in) 0.05 mm (0.0020 in) 0.01 mm (0.0004 in) 0.040 0.045 mm (0.0016 0.0018 in) (10 mm (0.4 in) from piston skirt end) 1st 60.25 mm (2.372 in) 2nd 60.50 mm (2.382 in) q;16x47mm (q; 0.630 1.85 in) Keystone Keystone 0.35 0.55 mm (0.014 0.022 in) 0.35 0.55 mm (0.014 0.022 in) 7-1