Being able to "read" a spark plug can be a valuable tuning aid. By examining the insulator firing nose color, an experienced engine tuner can determine a great deal about the engine's overall operating condition.

In general, a light tan/gray color tells you that the spark plug is operating at optimum temperature and that the engine is in good condition. Dark coloring, such as heavy black wet or dry deposits can indicate an overly-rich condition, too cold a heat range spark plug, a possible vacuum leak, low compression, overly retarded timing or too large a plug gap.

If the deposits are wet, it can be an indication of a breached head gasket, poor oil control from ring or valvetrain problems or an extremely rich condition - depending on the nature of the liquid present at the firing tip.

Signs of fouling or excessive heat must be traced quickly to prevent further deterioration of performance and possible engine damage.

At this time there are a few brands of Spark Plugs being manufactured in China. These Spark Plugs are more commonly found in Chinese engine applications and are not always readily available in other countries for aftermarket purchase.

In determining an NGK cross reference, we have found that the "Torch" and "NHSP LD" provide a good starting point. Torch and NHSP LD have a similar part numbering system which is also used across other Chinese brands.

For cross referencing purposes please consult the Cross Reference Chart.

CONTENT PREVIEW

1. REGULAR INSPECTION
1-1 Delivery Introduction  ----------------------------------------------------3
1-2 Inspection Before Running   --------------------------------------------4
1-3 Regular Inspection  -------------------------------------------------------5
1-4 General Inspection  -------------------------------------------------------6
1-5 Notes for Inspection  -----------------------------------------------------6

2. MAINTENANCE INFORMATION
2-1 Specification Sheet   -----------------------------------------------------7
2-2 Maintenance Date   -------------------------------------------------------8
2-3 Special Tools  --------------------------------------------------------------9
2-4 List of Grease & Oil Adopted  ----------------------------------------12
2-5 Circuit Drawings  --------------------------------------------------------13
2-6 Troubleshooting  ---------------------------------------------------------20
2-7 Tighting Torque of Screws  -------------------------------------------21
2-8 Troubleshooting  ---------------------------------------------------------23

3. DESCRIPTION OF PARTS AND COMPONENTS   
3-1 Engine  ---------------------------------------------------------------------23
3-2 Transmission Mechanism  --------------------------------------------35
3-3 Electric System  ---------------------------------------------------------40
3-4 Body  -----------------------------------------------------------------------44

4. DISASSEMBLY REPAIRMENT   
4-1 Notice for Disassembly Repairment  -----------------------------48
4-2 Removal and lnstallation of Engine  -------------------------------49
4-3 Disassembly and Assembly of Engine  ---------------------------51
4-4 Removal and Assembly of Carburetor  ---------------------------62
4-5 Removal and Inspection of Electric Parts  -----------------------64
4-6 Removal and Inspection of Body Parts  --------------------------90
4-7 Built-In Braking System    ---------------------------------------------95

TGB Service Manual 101S PDF