Electrical Maintenance

Submitted by xjcdadmin on Thu, 09/20/2018 - 11:00


1.      Disconnect:
•   Negative lead (1)
•  Positive lead (2)
•  Breather hose (3)

2.      Pull:
•  Battery

3. Check:
• Fluid level

Incorrect — Refill.

Fluid level should be between upper (1) and lower (2) level marks.

Replacement TCI Transistors

Submitted by xjcdadmin on Sat, 08/08/2015 - 17:55

The original transistors used in our Transistor Controlled Ignition igniter boxes are Fuji made ETD41-035. They were discontinued many years ago.

ETD41-035 transistor

Various sources dedicated to old Yamaha motorcycles such as the Vision and the Virago suggest that the MJE5742 is a drop-in replacement.

TCI Repair

Submitted by xjcdadmin on Fri, 07/17/2015 - 20:44
For many years my Police Special had a very nasty habit of dying like I had hit the kill switch.
It never sputtered first and would almost always do it within the first 1 km from my home.


Submitted by xjcdadmin on Thu, 06/27/2013 - 10:26


1. Checking

If the battery shows the following defects, it should be replaced.

a.    The battery voltage will not rise to a specific value or no gassing occurs in any cell even after many hours of charging.

b.    Sulfation of one or more cells is indicated by the plates turning white or an accumulation of material in the bottom of the cell.


Submitted by xjcdadmin on Tue, 06/25/2013 - 15:02



1. The fluid level should be between the upper and lower level marks. Use only distillod water if refilling is necessary.

CAUTION: Normal tap water contains minerals which are harmful to a battery; therefore, refill only with distilled water.

Sensors and Switches

Submitted by xjcdadmin on Tue, 06/25/2013 - 15:02

Fuel sender unit

1. Inspection

a.    Remove the sender unit from the fuel tank.

b.    Use a pocket tester (with ohm x 10 scale) for this check. Connect the pocket tester leads across the green lead and the black lead of the sender unit. The meter should show the following resistance at the specified fuel level. If not replace the sender unit.