Help Honda MC22 back from the Dead

Your right it’s not a CDI it’s a TCI but no mater it still does not fire up

 

Today I have looked at why of where does the TCI get its signals

Just an update

The pick up coil and statorare fine these have been checked

Changed TCI still does not fire up

So the one thing for sure is that the 120v needed to fire the coils is not present

I am now checking the Green and Red wire that comes from the starter relay and passes through the clutch switch and side stand to give the TCI a 12v feed.... I would like someone to confirm this is how the green and red from the starter relay works?

Thanks again for all your imput

By the way both coils Check on the primary and secondary sides, New leads and plugs

The DVA works and have confirmed this, so the pulse/pick up coils works and hence I can see that the 120v feed is not getting to the coils

 

Yes I know this bikes 20+ years old but we can rebuild you

I have also found an intermittent fault that was in the kill switch plug connect - now sorted

The clutch switch intermittent, this was self inflicted but fitting ratchet style levers - so I am aware of this now

The stator wiring from the stator plug to rectifier is slightly frazzled but passes current fine - awaiting new plugs

It’s best to keep in mind that when this bike came off the production line, rain and moisture was not a main concern, as none of the plugs and connectors are insulated at all so, will bare this in mind going forward... don’t want to have to go through this again

 

Yes I do why?

 

The confirmation that there is no 120v for the coils to fire the 20,000 volts is confirmed by “Murdo’s” suggestion of using a timing light which I thinks a brill idea because you don’t have to keep sodding about testing plugs

 

I thought I would lighten this post up a bit as it’s me asking for some advice and nothing else

So I thought I would post a pic or two of the bike there a few in between anyway that’s for later

 

View attachment 32901 View attachment 32900 View attachment 32901 I thought I would lighten this post up a bit as it’s me asking for some advice and nothing else

So I thought I would post a pic or two of the bike there a few in between anyway that’s for later

Hi there

Thanks for the reply

The 120v I’m talking about is on page 24 - 64 in the supplement section for the L + N models, the workshop manual does not give a full account of how the system actually works but I have picked up bits as I have gone along and yes not enough that I can work out what wrong yet

The coils as you say collapse when giving the 20,000 volts to the spark plugs. This happens every time the TCI switches off, as mentioned I have 4 sparks but only from the 12v side ie weak sparks

The 12v is constant on both coils

The stator windings are good as are the pick up coil they have been tested

This is interesting that I have since found out I did mention the bike pops back through the exhaust intermittently after turning over but not firing

The reason being is that the TCI shuts off after turning but not firing this happens after 2 seconds and this in turn shuts of the coils ( collapsing them) the sparks then depending where the pistons are ignites the unspent fuel,, boooom!

 

Hi mate,

Sent the stator windings and pick up coil to a pro company and all checked out ok, same as my meter said but had to confirm

The 12v is constant and the kill switch also does what it should now

 

Hi Tony,

Yes it’s constant since kill switch plug an socket sorted

 

The part of the circuit I do not fully understand yet is;

From the starter soloniod and it goes back to the bit I mentioned How when the starter stops turning the TCI shuts down and you get the 2 sparks

Well the Green and red from the starter Soloniod goes through the circuit changing colours and passing through the clutch switch, side stand etc and if I’m right ends up at the TCI, that’s where I’m at trying to understand how they work or don’t as the case may be?

So if anyone can explain that part of the circuit that would sure help

I have another Starter solenoid coming today or tomorrow as they current one (pardon the pun) does not put 12v down the green and red?

Upwards and onwards

 

Hi mate,

Yes thanks I have that and have been cross referencing between the original as I cannot read the wire colours

yes mate I have that thanks