ViragoTechForum.com :: Yamaha Virago XV Forums That Rock!!!

#1:  TCI Unit - XV250 (SOLVED) Author: Rats,  Posted: Sat Mar 06, 2010 10:37 am Hi All, I need a new/used CDI unit for my bike. All the wires check out OK but no spark to either plug. So....... does anyone know where I can get one of these in the UK? I can get one from California for $99+shipping, but just wondered if these can be gotten here. Thx Graeme Last edited by Rats on Sat May 08, 2010 8:39 am; edited 1 time in total

#2:   Author: grazingazer,  Posted: Sat Mar 06, 2010 10:47 am it's a tci not a cdi...there's a big difference between the two units

#3:  Re: CDI Unit - XV250 Author: Rats,  Posted: Sat Mar 06, 2010 11:40 am Well everywhere I have looked refers to it as a CDI unit...... I am new to bike electrics so only going on what I have read. Link below.. LINK

#4:  Re: CDI Unit - XV250 Author: grazingazer,  Posted: Sat Mar 06, 2010 12:07 pm tci refers to a transistor controlled ignition [what you have] cdi refers to a capacitor discharge ignition [what you don't have]...just because you see it on ebay doesn't mean the seller knows what he is talking about...it's also called an ignitor which might be a better way to name it...what it does is interrupt the ground to the coils' primary sides allowing the plugs to spark

#5:  Re: CDI Unit - XV250 Author: Rats,  Posted: Sat Mar 06, 2010 12:16 pm Thanks G - its good to know these things going forward...so i dont make an A** of myself ;-) Graeme

#6:   Author: grazingazer,  Posted: Sat Mar 06, 2010 12:21 pm have you checked your fuses? LINK

#7:  Re: CDI Unit - XV250 Author: Rats,  Posted: Sat Mar 06, 2010 12:36 pm Hi I have not checked them personally but the Breakdown chappie said it wouldnt even turn over if the main fuse had gone. I have just seen another fuse in the wiring diagram....and now heading out to check it. Thx for the info. Graeme

#8:  Re: CDI Unit - XV250 Author: Rats,  Posted: Sun Mar 07, 2010 8:16 am All fuses checked and OK so TCI ordered from the US. Will update when I get it and fit it. Cheers G

#9:   Author: Rats,  Posted: Sun Mar 21, 2010 10:22 am Well the part arrived and it still would not start. I was able to bump start it and went out for 30 miles or so. When I got back I kicked the side stand down in Neutral and the bike spluttered and stopped. I put the stand back up and it wouldnt start on the button - although it started on the bump again. This time I stopped and started it on the button with the stand up. I checked the resistance on the side stand switch and it was OK in the up position and nothing with it down - OK according to the manual. I have checked the neutral switch and the pickup coil and they give me the correct readings. Now, however, it wont bump start either. I am going bonkers trying to trace this! The Relay Assembly looks old and worn....I wonder if it could be that? Any help and assistance gratefully received. G

#10:   Author: totallyredvirago,  Posted: Sun Mar 21, 2010 10:45 am think you answered your own question.. its in the side stand switch... the side stand switch sends a signal to the relay which sends a ground to the TCI. this siganl will allow the TCI to spark the coils. without it... no spark.. my question to you is.. did you or a PO play with the relays at all.. it is possible to put the wrong relay in the right spot......dan

#11:   Author: Rats,  Posted: Sun Mar 21, 2010 11:28 am Cheers T......I am waiting for the breakdown chappie to come and have a look and I will point him at the switch! G

#12:   Author: Rats,  Posted: Sun Mar 21, 2010 1:33 pm Breakdown chap been and gone.....no spark when in Neutral. Could this still be the side stand switch even though it gives me a continuous reading when up and nothing when down? What tells it that the bike is in gear? Is it the Neutral switch? This is showing neutral....... Any thoughts peeps? Thanks G

#13:   Author: totallyredvirago,  Posted: Sun Mar 21, 2010 1:57 pm at the TCI there is a black/white wire... for diagnoses only!!!! cut the wire. do not ground it or put power into it.. just cut it and leave enough to splice back together. make sure it is in neutral. and see if it starts.. if it starts then the problem lies in the switch (side switch) or the relay.... here is a thread from way back on the problem i had with a switch and relay....dan http://viragotechforum.com/phpBB/viewtopic.php?t=17131&highlight=

#14:   Author: Rats,  Posted: Sun Mar 21, 2010 3:40 pm Cheers - that post looks imense! I will try it out tomorrow when I get back from work. Thanks again G

#15:  Re: TCI Unit - XV250 Author: Rats,  Posted: Sun Mar 28, 2010 8:02 am Hi - I am slowly working through the options..altho the wiring is different on my 250 from the 750......here is what I see in the attached wiring diag Not got to the bottom of it yet.... XV250_02-1.pdf  Description: Wiring diag for my XV250 (1995- ) Download  Filename:  XV250_02-1.pdf  Filesize:  348.21 KB  Downloaded:  1 Time(s)

#16:  Re: TCI Unit - XV250 Author: Rats,  Posted: Sun Mar 28, 2010 10:18 am Well the test was going OK until With the sidestand in the DOWN position, touch the red meter lead to the blue/yellow wire on the relay and you should also read 12V. If there is no voltage, then the connection is dirty or the relay coil is open (replace relay). If there's 12V on the blue/yellow wire with the sidestand DOWN, then raise the sidestand to the UP position and the voltage on the blue/yellow wire should then go to near zero. If you don't see the voltage drop to zero with the sidestand UP, then there's a bad connection or open wire somewhere between where the blue/yellow wire runs from the sidestand switch to the relay. I got a reading between 3 & 4 volts with the stand down and 0 when I raised the stand (no click though) I cleaned the connections and it didnt change so i am guessing the relay needs replaced? What do you peeps think?

#17:   Author: Rats,  Posted: Mon Apr 19, 2010 12:46 pm Well I am almost there! The bike will start with a jump from a car or a bump start but does not want to start cold on the button. It will start on the button if the engine is hot. About once a week it will start cold on the button. Does this sound like not enough power getting to a) Starter b) plugs ? Or am I missing the point... Cheers peeps G

#18:   Author: grazingazer,  Posted: Mon Apr 19, 2010 12:51 pm it's time to check the voltage at the battery m8

#19:   Author: Rats,  Posted: Mon Apr 19, 2010 4:11 pm OK - Left the bike for 1.5 hours and tested the battery - 12.92v and the bike started first time on the button. After 2 mins I stopped the bike and the battery read 13.15v I have disconnected the battery and will test it in the morning and then try to start the bike... Fingers crossed. Thx folks

#20:   Author: Rats,  Posted: Sat May 08, 2010 8:40 am New battery and it starts..........with a fight...but it starts... cheers to everyone for their input and help. G

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