As some of you know 400a change switches are getting hard to find.
When the bike is in neutral the change switch is off and the change relay transistor is on. This allows the starter motor to work, the motor to run in neutral with the side stand down and the motor to idle at 1250 + - 100 RPM with timing at 7.7 degrees BTDC>
When the bike is in gear the change switch is on and the change relay transistor is off. In this position the the starter motor wont work, the motor wont run with the side stand down even in neutral and the idle will be about 2000 + - 500 rpm with the timing at 15 degrees BTDC. The timing and rpm is done in the CDI box when the bike is put in gear.
If the change switch goes bad I think you could wire the change switch wires together and bypass the change switch. This will "tell" the bike its in gear. The starter motor wont work, the motor wont run with side stand down and the idle will stay high with the timing fed thru the SCR2 gate.
You could rewire the starter button or just use the kick start.
Down side
The bike will start in gear.
The motor wont run with side stand down.
The idle would stay high because the timing is triggered thru the SCR2 gate.
You might be able to lower the RPMs some at the carbs.
I have not tried this but it might keep the bike on the road till a change switch can be found.
Thoughts comments
Bill
When the bike is in neutral the change switch is off and the change relay transistor is on. This allows the starter motor to work, the motor to run in neutral with the side stand down and the motor to idle at 1250 + - 100 RPM with timing at 7.7 degrees BTDC>
When the bike is in gear the change switch is on and the change relay transistor is off. In this position the the starter motor wont work, the motor wont run with the side stand down even in neutral and the idle will be about 2000 + - 500 rpm with the timing at 15 degrees BTDC. The timing and rpm is done in the CDI box when the bike is put in gear.
If the change switch goes bad I think you could wire the change switch wires together and bypass the change switch. This will "tell" the bike its in gear. The starter motor wont work, the motor wont run with side stand down and the idle will stay high with the timing fed thru the SCR2 gate.
You could rewire the starter button or just use the kick start.
Down side
The bike will start in gear.
The motor wont run with side stand down.
The idle would stay high because the timing is triggered thru the SCR2 gate.
You might be able to lower the RPMs some at the carbs.
I have not tried this but it might keep the bike on the road till a change switch can be found.
Thoughts comments
Bill