Ignition Timing Adjustment For Honda Trail 70, CT70 And Mini Trail 50

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Ignition Timing Adjustment
CT70 And Mini Trail 50

(1) Breaker point gap (2) Breaker locking screw	Adjustment of contact breaker point gap and ignition timing are required to maintain satisfactory performance.
	1. Remove the left crankcase cover. 2. Rotate the flywheel counterclockwise to find the point where the breaker point gap is at maximum and check if the gap is correct using a thickness gauge. 3. The standard gap. (figure 1) is 0.012-0.016 in. (0.3-0.4 mm).

(3) Index mark
(4) "f" mark

4. When adjustment is necessary, loosen the breaker locking screw (2) and move the breaker base in either clockwise or counterclockwise direction to obtain the standard point gap setting.
5. After completting the breaker point gap adjustment, recheck the ignition timing. To perform the check, rotate the flywheel so that when the flywheel "F" timing mark (figure 4) is aligned to the timing index mark (figure 3) on the left crank case, the breaker points just begin to open.

Spark Plug Adjustment

1. Spark plug gap
2. Negative electrode

CT70
The NGK C-7HS or ND U-22 FS plug is used as standard equipment on this model. Servicing of the spark plug is as follows.
Mini Trail 50
Standard Plug is NGK C-6H Or ND-U20FS

1. detach the high tension cord from the spark plug and remove the spark plug with the special wrench provided in the tool kit.
2. Inspect the electrodes and center porcelain of the spark plug for deposits, erroded electrodes, or carbon fouling. If the spark plug deposits are heavy, or the electrodes appear to be erroded excessively, replace the spark plug with a new one. If the spark plug is carbon or wet fouled, the plug can sometimes be cleaned with a stiff wire such as a pin.
3. Adjust the spark plug gap (figure 1) to 0.024-0.028 inch (0.6-0.7 mm). The gap can be measured with a thickness gauge. The adjustment is made by bending the negative (grounded) electrode (figure 2).
4. When installing the spark plug, do not over tighten.

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Ignition Timing Adjustment
CT70 And Mini Trail 50

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CT70 Identification Guide

Honda CT70 Bikes By Year Model:

My 1977 Model Bikes:

Bike1

Bike2

Bike3

Bike4

Bike5

4 Speed-Manual Clutch Bikes:

1970 H

1971 H

1972 H

3 Speed-Automatic Clutch Bikes:

1969	1970	1971	1972	1973
1974	1975	1976	1977	1978
1979	1980	1981	1982	1983
1984	1991	1992	1993	1994