A35 CDI woes and troubles.

Hey guys, I swapped a kickstart A35 on this earlier Bullet and I’ve been trying to figure out my no spark issue. To my knowledge the stator and the CDI box is good and so is the wiring but still no spark. I haven’t touched the bike in a while but the last time I messed with it a buddy came over with an oscilloscope and we took a look at what was coming off the stator, lights are good and we saw shit coming from the ignition. Today I hooked up a test light off the ignition wire and couldn’t see any light so I decided to dig in and see what I could figure out. Is there an air gap spec between the coils and flywheel? I’m almost wondering that that could be off but haven’t found any measurements as to what the gap should be, nor have I been able to eyeball anything close to where it isn’t rubbing. What am I missing? On that note, does anyone have a complete three screw 90mm CDI setup they would sell to me?

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Re: A35 CDI woes and troubles.

Tweaker trash /

If I was there I could fix it in 3 min

Re: A35 CDI woes and troubles.

♣Slew Foot♣ /

Tail wiring wonky kill engaged

Regulator grd out hooked to cdi grd

Re: A35 CDI woes and troubles.

I went through a rewired the bike for CDI and bypassed the resistor in the taillight. Unless i’m missing something, the wiring should be all correct.

Re: A35 CDI woes and troubles.

bring it over sometime, we'll fixit ;)

Re: A35 CDI woes and troubles.

The coil to flywheel air gap should be about .010" .

I usually set it as tight as possible without anything touching while rotating the flywheel .

Some like to use a strip of milk jug plastic for a gauge . That's generally close enough .

Re: A35 CDI woes and troubles.

maybe point some good light on The left side engine area and post a few really good pictures of the situation. then you might be able to get some info of what you got going on there!!

Re: A35 CDI woes and troubles.

Did you ohm out the coil?

If it's an oem box, they are pretty prone to fail. I keep one of the crappy restricted ones around just for that reason. I don't really know a good way to test a cdi besides swapping in a known good one

Re: A35 CDI woes and troubles.

Note I'm making some assumptions on the CDI circuit design based on what seems to be common in the industry; there's a thousand ways to skin a cat.

My guess is that the most likely component to fail in a CDI box is the Silicon Controlled Rectifier (SCR). Fortunately this is a device that you can test, and it's pretty easy to test with a multimeter, even with it in the CDI circuit.

Assuming:

1) The SCR anode is connected to the ignition coil and the CDI capacitor

2) The SCR gate is connected to a trigger signal, through a resistor

3) The SCR cathode is connected to the bottom end ("ground") of the primary winding on the coil

Step 1: Put your multimeter in resistance mode (use a high range if using a manual meter)

Step 2: Connect the positive lead to the SCR anode, connect the negative lead to the SCR cathode. The meter should show an open circuit (high resistance)

Step 3: Reverse the leads (positive to cathode, negative to anode). The meter should show an open circuit (high resistance)

Step 4: Connect the positive lead to the SCR anode and the SCR gate, connect the negative lead to the SCR cathode. This should turn on the SCR and show a short circuit or low resistance.

Step 5: While leaving the SCR anode and SCR cathode connected to the meter, remove the connection to the SCR gate. This should continue to show a short circuit or low resistance, showing the latching behavior of the SCR (important).

Re: A35 CDI woes and troubles.

♣Slew Foot♣ /

Is this a 1srt generation or later. The 1rst don't require a trigger the 2nd does.

Re: A35 CDI woes and troubles.

Richard Eberline /

With the CDI wired up, remove the one wire going to the HT external ignition coil's positive connection. Remove the spark plug. Set a multi meter to AC VOLTS, 200 scale. Hook red lead to HT coils lead and black to a good frame ground. Crank the engine over and you should see ac volts.

Re: A35 CDI woes and troubles.

Update:

I got it running tonight. I swapped over a parts stator I had laying around with damaged light coils but apparently a good ignition coil. Lights dont work but thats because the windings on the light coils rubbed on the flywheel in a past life. So now it's just time to swap coils around and make the magic happen! Thanks for the help folks.

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