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I have the BEST year 1985 #587 17k Bone stock.

Never mind Black is good. That leaves me at bad TCI Any suggestion other than a $600.00 part ?

The boxes house the coils and are near flywheel, OK I think Im good, spec says 110ohm +/- 10% I got 100ohm using black wire as ground at each wire, on 5 connector underseat. I tested continuity on each of the 5 wire connector from underseat to TCI all are good EXCEPT THE BLACK WIRE, IT APPEARS...

I tested 5 pin connector underseat comming up from motor. Using black as common all four measure 100 Ohms (CRAPPY METER)

You said "Two coils per box. One box is for front cylinders and other is for rear." What is box?

As I understand the TCI is a two part system, Igniter and pickup coil. Does'nt seem that 1 circuct would fail at Igniter. Are there 4 indvidule pickup coils?

plug checked, good. plug wire, good coil resistance, good Coil contanuity, good Coil + wire side, good. Coil - side wire to TCI, good. That leaves use at TCI Anyone know how to test TCI? (TCI fires 3 other plugs) Grrr#@&?*!!

Has anyone experienced IGNITOR UNIT (TCI,BRAIN..ECT) failure on 1 circuit, and the others worked?

Tried that, no spark at RF cylinder

Update. switched coils working to the no working circuit. The one I thought was bad works on the Known working circuit. I know all coils work properly. I know the stand switch is working. I know the circuit that fires my RF cylinder has an issue. Key on has power at all coils. yet no fire...

yes I think its the kickstand relay But that would effect all cylinders? (i have fire at 3 of the 4 cyl)

yes I have ol'85 coils are good. just the RF wont fire I think it has some sort of relay. Im firing on 3 cylinders. Front right no spark. Coil ck ok, plug wire ok, connectors tight.... What is this? A relay? its marked 4U8-01 ONRON 1625D9 How do I ck to see if working properly?

This thing is wired in on the + side of the coil wire

Im firing on 3 cylinders. Front right no spark. Coil ck ok, plug wire ok, connectors tight.... What is this? A relay? its marked 4U8-01 ONRON 1625D9 How do I ck to see if working properly?

The factory Epoxys these together. Yours failed. Before you reassemble, make sure steel insert slides freely into plastic tube. I use a dremel tool with a steel wire brush tip. The Epoxy holds it together. If your steel insert is to tight, taping it together WILL BREAK THE PLASTIC TUBE. Been the...

visual sync? What are the steps?

enrichment (secondary) diaphrams= new diaphrams, springs, both carb side and cover side circuts are clean. Carb are seated properly on new boots. (yes they have a maniflod side and a smooth carb side)

tested on another motor, gauge is good.

Tried my gauge on my Rhino, Gauge works correctly. Googled "Erratic Vacuum gauge readings" and found this cool Diagnostic site http://www.secondchancegarage.com/public/186.cfm According to my gauge, and this site, I may need valve springs? at 16k miles? Grrr *@/?^% !!!

carb-to-carb throttle springs installed properly. enrichener and carb piston diaphrams gaskets o-rings are brand new. (complete rebuild) All cylinders Vac gage, needle swings wildly