Ipleedthe5th

I did a bench sync on the carbs after I put them back together, which did seem to give it a much better chance at running than before. I also replaced the caps and wires along with the spark plugs. All connectors and pins have been checked, cleaned, and greased. All coil and pick-up tests have come back within spec with the exception of the boost sensor which is putting out 6.3V at atmospheric pressure. As far as I can tell at this point and after spenidng the day in the library and checking everything over 100 times; it seems like everything is in really good shape and tuned well enough to get it running, its just the TCI being in barely good enough shape for it to fire. Unfortunetly I dont have anyone in the area (willamte valley Oregon) with a good TCI that I can plug in to see if thats the only outstanding issue now.

I have been living in that library for the past 24 hours. And what a godsend it is. Has been emensly helpful. I had no idea that It actually NEEDS the air restriction. That changes a lot. Given that components in the TCI litterally fell off at the touch of a q-tip, i'm guessin thats probably my biggest problem right now. Trying to find replacement bits is really hard. (talking about the ETD41-035 transistors specifically). I might just cave and get the aftermarket TCI everyone is talking about on here. And thanks for the welcome, I'm no stranger to working on older cars and bikes (my former bike was an 87' Honda v45 Magna) but this computer controller stuff is driving me mad, mainly because I have the skill to fix it, but cant find the parts too. Wish my 3D printer could make electrical components.

Ok, so I found that the main transistors are ETD41-035's. That they dont make any more. And then found this article ( https://www.xjcd.org/TCI_transistors ) that says ST901T can replace them and work well. though these are also hard to find. Any thoughts?

What a fantastic thread. my 83' is having the exact same issues and after reading this thread I decided to cut my TCI open (I was not as lucky as the OP. It had corrosion and one of the diodes even fell out when I touched it with a q-tip) So I am excited to see its a "easy" fix if im careful. Could someone tell me what the 4 main transistors are? Mine look like garbage and I think its a good idea to replace them while I am in there. Unfortunately the labeling has worn off so I have no idea what specs they are to get replacements. Congrats Geobob on getting it up and running and thank you and everyone else here for documenting the process so well, its going to be a huge help

LOL. Thank you for the heads up and the welcome. I must have gotten trigger happy and posted before the image loaded. here it is. Its one of those little blue bits. Im thinking its a diode?

UPDATE: So as I was getting into doing some basic cleaning on board and removing the brown sealer as it is covering some corrosion in spots, this (see image below) part broke right where the wire comes out of it and I litterally just sneezed on it. so needless to say thats probable part of my problem. Which now brings the question, what is it and where do I get a new one? Also are there any schematics out there so I can replace any other parts that decide to break off during cleaning?

Hey everyone. New to the forums here and new to ventures. I picked up an 83' which had been sitting for probaly5+ years. I had it running last year but it was running really rough and chugging fuel like a frat boy chugs 4loco. So I ended up tearing the carbs apart and cleaning them. Got it back together and now the bike runs rough (though it starts a lot easier). I can tell she really wants to run but something is holding her back, I am guessing the timing. The tach jumps all over the place and sometimes just sits at zero while running. I have already remounted my TCI and found that the bosst sensor is bad (its putting out 6.3v at atmospheric pressure). Even with that unplugged it runs rough. I also get lots of backfires, mostly just little puffs from the #2 carb. I have also tested the fuses and coils which seem to be good. dash cluster works fine as well. I know all the timing is computer controlled which I hate, I almost exclusivly have owned 80's vechicles because of how easy they are to work with due to lack of computers. That said, for the few seconds at a time when the bike decides to run right I can understand why people love these bikes so much. Anyways, I go another boost sensor on the way and after reading some threads here got brave enough to cut open my TCI and think I found a few issues in it but could use some help as to what I should actually do with it (I do have honed soldering skills) Here are a few images of it. The bottom of the board looks good, that black wire I added in as the eched in wire looked like it was on it way out. As for the top of the board, I think it speaks for itself. Thanks in advance for the help and hope to be able to ride alongside some of the Pacifc North West members soon!

Yikes, then I have it way overfilled. Hope I didnt do any damage to it. I'm ganna go bleed some out right now and see what happens. Thanks for the tip!

Dont mean to highjack here, but I'm also haveing issues with my 83' and now that I read this realize it started happening after an oil change. When you say 1/2 way up the glass, is that with the bike running or off? Thanks for the tips.