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TCI unit Bad, part # JE8-85630-00-00 Any help?

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  • Ronnie Carver Aug 24, 2010

    It is for a YT6800 Yamaha lawn mower
    TCI unit assy 2
    JE8-85630-00-00

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Servicing Transistor-Controlled Ignitions

A transistor-controlled ignition (TCI) uses transistors, resistors, and diodes to control the timing of the spark to the engine. Because it has no moving parts, it too is called a breakerless or solid-state ignition. Most TCIs require no service. However, to ensure long-term performance, perform the following inspection on a regular basis.

The TCI controls a voltage of up to 30,000 volts for delivery to the spark plug. Be extremely careful when working around the TCI, as you can injure yourself or the ignition system with high voltage. Use the following steps to service a transistor-controlled ignition unit:

Step 1: Remove the lead from the spark plug to prevent starting. Ground the spark plug lead by attaching it to the shroud.

Step 2: Check the TCI unit to make sure it has not been damaged. Sensitive electronic components are mounted on a printed circuit board within the box and can be damaged by force or by excessive heat.

Step 3: Check all leads to and from the TCI unit to make sure they are tightly connected and that insulation is not cut or frayed.

Step 4: Visually inspect the magnet and ignition coil mounted next to the flywheel. Look for damage to the end of the magnet or the edge of the flywheel.

Posted on Aug 24, 2010

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Hi, we're going to need more information to help you. Can you describe the type of unit you're referring to, make, and model number, in addition to the part number? I couldn't run down anything except transmissions searching for "TCI". I will await your reply, thanks.

Posted on Aug 24, 2010

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1 Answer

TCI module getting fried... too much current but not sure why.... yamaha xv 250 2010 vstar


Hi, Ono I would love to help you but I need the year, make, and model of your motorcycle please ask your question again and provide this information in the details box or comment section or edit your original question. Good luck and have a nice day.

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No spark at the plugs, Have traced it to the TCI Box, has new stator and the single pick-up


You've covered all the bases for sure, and I know it stings to buy a new tci because you own it whether it's the problem or not, aside from running your wires and being sure your switches are good.
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I have a first generation 83 yamaha venture 1200 v 4 i have power to only 3 of the ignition coils the fourth coil has tested good by taking #3 lead and plugging into #4 coil. any ideas on what part to...


Okay...when you say power to the coil...I think you mean getting a spark on the plug wire?

All 4 coils should have battery voltage on the red/white wire to each coil. The second wire returns to the igniter (TCI....ignition black box) and it switches that wire off and on to ground to cause the coils to fire. If all 4 test good...then
Check out the TCI, the large box mounted on the coil rack that the connectors are clean.
Now remove the 6 wire connector from the TCI...and test the resistance of the pickup coils which are located under the left crankcase cover beside the stator coil.
you will be testing the following wire pairs on the 6 wire connector
Orange-Black
White/Red-Black
Gray-Black
White/Green-Black
You should see at ambient engine temp...about 110 ohms resistance on all 4 pairs.....if one pair is showing no resistance...you need to test at the lower 5 wire connector just below the seat left side with the same 5 colors....unhook and test....if still having one bad test...pickup coils may be bad.

Apr 10, 2011 | Yamaha Royal Star Venture Motorcycles

2 Answers

It not geting any spark new coils also


I would test the plug wires and plugs first to make sure the fire from the coils is actually reaching the plugs. Then check the ignition switch to make sure your getting a complete circuit. IF this si not the problem, have your stator checked. It is the piece that goes around the crankshaft, and produces electricity for the bikes systems. If you need additional insight, provide additional information, and I will try to help you further. Thank you for calling on FixYa.com.

Apr 13, 2010 | 1982 Yamaha XJ 650

2 Answers

No spark on 1980 yamaha xj650


Has the fuse block been upgraded? I'd check there first. If so I'd check stop/run switch. Then check the pickup coils at the TCI, Check the Coils at the TCI, Check coils, check plug caps. Also check connections at the coils.

Hope this helps!

Sep 14, 2009 | 1980 Yamaha XJ 650

1 Answer

Cut safty wires from 86 xv700c virago TCi sidestand&rev limiter


You can cut them and see if that works but you might have to connect them together if it is a closed loop circuit. just use a meter to check the voltage with the stand up and down. if one wire is hot with it up or down you will need to connect the two to trick the bike into thinking the stand is up. But they are both hot then cut the wires and terminate them so they don,t touch anything and you should be good.

May 29, 2009 | 1989 Yamaha Xv 250 Virago S

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