I recently picked up a fairly disassembled 1971 CT1. They bike came totally stripped of the electrical system except for the ignition components, and was not generating a spark. Upon further inspection, I discovered that most of the remaining electrical items were mismatched and incorrect for the bike. Wrong coil, wrong spark plugs etc. I replaced the points and condenser with a new set from ebay, and still no spark. In fact, I can't get the points to open at all.

Looking inside the flywheel, I can see that the lobe on the flywheel doesn't even come close to touching the arm on the points. I took the stator plate and the flywheel out of the bike to inspect. With the flywheel and the stator plate put together outside of the bike, the points cam isn't even close to reaching the points. This leads me to believe that I have either the wrong flywheel, wrong points, or wrong stator plate. I have no idea which - if any- parts are original to the bike.

I have tried 2 different Hitachi f-130 flywheels - neither points cam touched the points to open them. The bike has the 2 coil stator plate. Is it possible that this is the wrong one for the bike? Are there measurements that I could take to determine? Could I have bought the wrong set of points for this bike? Can someone verify what the correct points should look like? The points that I installed seemed to fit that stator perfectly.

I've scoured the internet and the service manual to try and get headed in the right direction before I throw more parts at it, but no luck yet. People around here seem to be a wealth of knowledge and good info. Any help would be very much appreciated.

Here are some photos of the stator and flywheel.

Service manual is available in the Tech Library here.

I don't know if I have an ignition easily available to compare to yours... I will look and see.

The "gap" on the points base in the attached photo should line up to the "gap" on the stator base. That's your leverage point when adjusting the points. Doesn't look like the points' base has enough of a slot where the mounting screw is to get you there, so, I'm guessing you got the wrong set of points (or the right set for your bike, but wrong set for the stator on your bike). If those gaps were lined up, the arm on the point set would be way closer to the cam on the flywheel nose.

Hi, just a random thought but i'm sure there was one model of 175 like from "74 on later shape that had an advance retard cam on the flywheel. Just thinking ok, if someone had fitted 'that' plate without the correct flywheel then the cam will never reach the points because they sit further away to allow for the fat cam which moves under spring & weight tension. Came across that on my RT1 360 & only one year of 360 'had that'--& maybe only one year of 175. Wasn't on CT1-2-3 but the later stator plate related to 'that' 'advance' flywheel probably fits the early case.

That's a pretty long shot so are you sure you can't adjust the points to touch the flywheel at about 1.8mm before top dead center?. In other words if you set the piston at 1.8 or as close as you can easily get it--then loosen the points & move them to 'just' touching the cam. Then gap at about tdc or a little past tdc should be in the ball park of 15 thou or so. Should still be able to just observe the gap through the flywheel slots. Just also thinking the points fiber heal would be unlikely to wear enough to run out of points adjustment.

Pic below of a random advance flywheel i google for. Also one model of Farm Bike Yamy AG175 had 'that advance cam but had a heavy flywheel although the stator plate would look like & fit a CT1 as still used the early type cases.

Very good thought! Can't happen on the 175's though because Yamaha changed the stator diameter to 120mm in 1974 so the advance type won't fit the earlier bikes with the 130mm stator.

Flywheel and stator look like the correct ones. I think Apex is on to something about the points maybe being wrong. Could be the points are made for the later models with the advance? Maybe a picture of the points removed from the stator would help.

Wow, thanks! I had a feeling you guys would have some ideas. The points cannot currently be adjusted to touch the flywheel at any position. They sit too far in to the stator depth-wise. It's almost like it would need a spacer between the stator and the points for them to even get close to the cam lobe.

I'll take the points out and take a closer photo. Can anyone track down a good photo of what the points and stator should look like in a 71 CT1? I'm having trouble discerning which photos on the internet are labeled correctly. Many seem to be labeled incorrectly as CT1/2/3 compatible.

If it looks like the stator needs a spacer under it to get up high enough, you probably have an issue with the flywheel not going onto the crank properly. Damaged key? Keyway? or taper?

The key, keyway, and taper are all in pretty good shape, and the flywheel does seat fully. Even out of the bike, I can put the flywheel and stator together so they touch (more than they engage when installed in the bike), and the points still aren't deep enough to touch the cam. There is no way that the flywheel could fit further on to the crank taper without hitting the stator.

Attached is a photo of the points that I installed. Does this look like the correct set?

Thanks again everyone! Much appreciated

It's possible the flywheel is incorrect then. I'm pretty sure I have a set at home and will take some measurements tonight.

I don't know of any points that are "taller" so if the cam is not deep enough to reach the points cam with the flywheel touching the stator that might be the issue..

(When you originally said the points would not touch the cam I thought you meant the points rubbing block was too far away radially... like the points needed a taller rubbing block or longer adjustment slot.)