CDI conversion, lost timing advance

Henrse01

New Member
That is for the add to the group, this is my first post so if I posted in the wrong area or broke a rule I apologize, I have been working on getting my moms K0 Ct 70 road worthy again l, and 4 years ago my friend and I got the bike all ready to go, started on the first kick and we were off, put it away and the next time we tried to kick it over it wouldn’t start; went back through the basics and noted the spark was gone, we looked into the stator, and noticed something came loose and messed up up the points and such, it got tabled for about 4 years, I got a different stator kit and installed it but when I went forward with reassembly I noticed the timing advance mechanism that sits inside the hitachi magneto was missing, and I can’t find it! Well I’m in a position to dedicate time to the bike again, and I am considering a CDI ignition change, no more points or timing or all that, so

1. Any recommended CDI kits that are plug and play with the 6v system that work well on Ct 70s

2. Do I need the timing advance mechanism at all anymore with a CDI conversion? I know that since the points are not needed anymore in theory I would not, but will the function of the magneto be impaired without it? (Like does it act as a spacer, and if it does can I just put washers in to replicate the gap)

Thanks !
 

kirrbby

Well-Known Member
Your mom's bike must be a 4speed? H model? Those are the ones that came with a timing advance mechanism. If it's a 3speed, semi auto, it wouldn't have the TA mechanism.

But no matter...the 6 volt CDI kits that are popular now would require you to remove the TA mechanism anyway. So you're good.

I'll look for the threads that discuss those CDI kits so I can post them for you...

 

OLD CT

Well-Known Member
One of my ebay cdi kits fit without removing the timing advance weights on a Mitsu stator. I just removed the points cam, Allenp stretched/rewired it for me and rebuilt a few other stators for me at the time. They come with the wrong connectors and the wires are a little short for my liking, from the vendor. Send xrarespares all your info, wire length and pictures of the plug. Maybe they can get it right by now or be prepared to re do them yourself.
 

Henrse01

New Member
Hey thanks a ton!, Im glad you guys responded because I was way off, Im an idiot, it's for sure is a 3 speed, I rode it a lot when i was a kid and I know it has 3 speeds, so no timing advance! great news, I guess I didn't lose a part, Ive been working on a couple of CT 90s at the same time which both have timing advance behind the points plate so I guess it was on the brain.
 

Henrse01

New Member
61323597087__68F56E21-3819-426D-B127-5DDB93A65B4C.jpeg
Yes, I think that’s the way I’m going to go, I’m reading a lot of good things about those kits, thanks all for the advice and knowledge. I am by no means a mechanic, in fact I had no mechanical knowledge at all, it’s been working on these little bikes that has taught me everything, and it’s been a blast learning, but I still have A TON to learn
 

OLD CT

Well-Known Member
If you do buy one be sure to change the headlight bulb from the stock 15/15w bulb to a CT90 25/25w as the cdi gives you more voltage than a points setup. Run the headlight ''all the time'' to prevent the battery from overcharging, if you run a battery setup. You will be able to ride at night now compared to the weak 15w bulb.
 
Top