Steamer with bad habbits

[London_Phil]

Fat white goes direct to battery via a fuse. Brown one goes to the switched live circuits, so yes one is live at all times. Alternator outputs the dc charging voltage, as it contains all the charging components, ie stator and rectifier/regulator system.
Bike should run without the alternator.

BUT ...DO NOT USE THE STARTER WITH A WEAK BATTERY....YOU WILL DESTROY THE STARTER SPRAG CLUTCH.


Just don't do it. Unless you have a very early engine with an access cover, you run the risk of a serious repair.

[Titus]

Never did it Phil, always backed up by car battery, thanks for the head up, well if it should run it doesnt, just behaves like in the video.
My tiger has the fat white running up the main harness, no connection to the battery, called it up and goes to a con block then to the ign switch. So...same as in the wiring diagram.
Behaves like the cdi runs out of juice to feed the coils, doesn't look the same to you? Starts the runs progressively less. Already checked all connections so I'm out, pickup coil arrived today, will change it after I fit the alternator and check how it goes. If both these parts dont fix her, we will have to wait for the cdi to get here (hoping it's a good one). Guess it's time to start throwing parts at her until she wakes up.
Wish me luck.You cannot see attachments on this board.

[Titus]

Nothing worked, alternator charging fine, also fixed DAR, fitted brand new pickup coil, no difference, bike starts then stops, sometimes no spark at all.
I'm out of ideas, cdi is on the way but ebay estimates 30'th this month, and of course its a second hand part, who knows if it works...
Anyone have a spare, working cdi?
WHAT ELSE CAN I CHECK?!?!

[London_Phil]

Leftfield, but how's the petrol flow?, the tank filter can collapse and starve the bike, as well as a tiny filter in the Tee near the carbs.

[Titus]

Petrol flow not relevant, it's being fed by a cup, no filter, no tee in the carb (just rebuilt them).
Even tried running it on starter fluid, no difference, also thought about fueling but still...ruled it out with the starter fluid.
Also float bowls full of gas, plugs full of gas.
Ghost relay is the sidestand/neutral switch thingy, bridged it.
Could all three coils leave the chat at once and cause such madness?

[London_Phil]

Think a swap of the cdi is the next place to go...

[Titus]

Unplugged everything not related to the starting/ignition - same.
Does it have another fuse besides the main one in the "trunk" the rest are labeled horn/head/stuff like that.
Only place I havent checked for good contact is the start stop switch...could it be? Afraid of springs flying everywhere.
Cdi...yes on the way, but what if its a dud?

[London_Phil]

Most T400 cdi units will work, they just have different rev limits and some minor timing differences.
Germany has many, as it was very popular over there.
This is probably the best value

https://www.ebay.co.uk/itm/364311056219

[London_Phil]

And regarding the fuses, the connectors can become bad, both the main connector for loom to fuse box, and under the fuses themselves.
It's been a few years since I had my Steamer, so I'm struggling to remember, but I don't think there are any other fuses.

[Titus]

The cdi I bought was 48 gbp 
So yeah, we'll see, I'll check all of the fuses just in case, reconect the battery just in case and take apart the start stop, maybe a hot wire loses conection, maybe...

[London_Phil]

The cdi I bought was 48 gbp 
So yeah, we'll see, I'll check all of the fuses just in case, reconect the battery just in case and take apart the start stop, maybe a hot wire loses conection, maybe...

Good price...

[Titus]

Just hope it's not broken

[London_Phil]

Looking back over the forum, there is some evidence that the ecu transistors can fail on the T400, so hopefully the repair will work. Luckily they are not totally SMD boards. I did have one in bits years ago, but unlikely to have the photos anymore..

[Titus]

Well, that would be something, they are tip 152, one of them had leaked (coil 1 driver) but my electronist said its no problem. Ok will change all 3 tomorrow and see what happens.

If you dont let the engine start (wot) you get constant spark, soon as she fires and sparks have to be faster they (sparks) just fade away.

Of course it's a power delivery issue from the ecu, has to be.

[Titus]

Nothing works, booked a mechanic for friday, hope he can figure something out, she runs on starting fluid though but if you try to accelerate something bangs inside.