Table Of Contents - Yamaha JT1 Series Service Manual

CONTENTS
CHAPTER 1 GENERAL .................................................................................................................... .
1- 1 Profile ··············································································································--···--·--··
1- 2 Features ··--··--···----·--········--···--·--·················--·--·--·--·--·--················································ 2
1 - 3 Specifications and Performance ·----·--·············································--·--------·------·--··--·--· 3
1 - 4 Performance Curves ·······················--·· ··--··--······--···--····----·--·--····································· 5
1 - 5 Tools and Instruments for shop service ··································--··--·--···--··------·--·----------
6
CHAPTER 2 YAM AHA AUTOLU BE ·--·----·--------·----·--·----······ ·················--·--··--·--·------····--··------·--·--······ 7
2 - What is Yamaha Autolube? --------------------------···························---------------------------------- 7
2- 2 Features of Yamaha Autolube --··----------··--···--···················--·----------------·--·--··--··----·--··· 7
2 - 3 Handling the Oil Pump --------------··------------------··----·························----··--------------------·-- 7
CHAPTER 3 ENGINE ·························································-------------------- ----···································· 1 I
3 - Engine Remova1 ----------------------------------···--······································----··------------·--------·· I 1
3 - 2 Cylinder Head ···········································--··------------------------···----····----······················
15
3- 3 Cylinder ·······················--···········································--·--·----·--·--··--······················--······ 16
3- 4 Piston Pin --··········--······--··················--···--············--·--·------------·------··--···························
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3 - 5 Piston Ring ·········--·········--·--·--································--····----------------··--··························· 18
3 - 6 Piston ----·--·--·······--·--·--·--·······--······--··· ·········································----·--·----·········· .......... 19
3 - 7 Flywheel Magneto ···································--·--·----··--------··----·--·--·--··········--········----·------·
20
3- 8 Crankcase Cover (RH)·····························--·--·--------------·--·--···························--··--·---- 21
3- 9 Clutch ············································----·--·--·--··--·······--······················--····--···--··--····--·--··· 22
3-10 Primary Drive Gear··················--····--·····················--·--------------·························--·--·----· 27
3 -
11
Kick Starter Mechanism ·····································----------··--·--···················--·----------··---- 27
3-12
Shift Mechanism ----·············--···································--------------························--·------··--
29
3-13 Rotary Valve····--·····--········································--······------····························------········ 31
3 - 14
Drive Sprocket ················································--······----------·····························--··----····
33
3 - 15 Crankcase --·--························--·········----------------·----------··························------------ --·--····· 35
3 -16 Transmission Assembly ----·····--·--······································--------------------··················---- 36
3 - 17 Crankshaft ·--··--··--·········--········································--··----·······························--·--·----···· 38
3-18
Bearings and Oil Seals .............................................. --·······················----········----·······
41
-3-19
Carburetor ····--·····--·························--··········--·············--·--·················------·--·····--·--········
42