Pinout, testing DC CDI unit Honda TRX300 1988

This very basic video informs the viewer of how the 1988 Honda TRX 300 ATV DC CDI unit is wired up and how some diagnostics can be carried out using a multimeter if you have no spark. Many thanks to utubers Learning zone and Rolling Wrench for their contributions. I had no idea where to start when I first began trouble shoot my no spark issues.

[@williemcmaster9422]

Thanks for taking the time to make this video. Helped me greatly.

[@butchgarner3911]

is there another part to this here you get into the actual testing of the CDI (DC) unit itself? That is hat I need. I have the connections you have stated in this video and they are in the correct position, but from there to the testing.....I guess talking this out here just told me if I get the values coming in here they re supposed to be then the CDI would be defective..... ok, thanks for the help!! geeish i really do need to get one of those plastic frogs or dogs to sit on the bench I can talk to, just to hear it being said to make sense of it all... thanks again!

[@jordananderson8299]

I have an aftermarket DC CDI not made for Honda bikes. Bike does start and rev but when put it in gear has an insane rev limit and won't go past a cartain RPM. The universal DC CDIs have 2 ground pins one of them is what you describe as "Alternator sensor".in the video. Will there be an issue if the wire is grounded? Is there a hack for non-Honda CDIs?

[@philipthemechanic5782]

are they using 6 volt ignition coil? because all my electronics are new and im only getting about 6 volt to the ignition coil wire

[@philipthemechanic5782]

if i disconnect the gray wire would it still work?

[@philipthemechanic5782]

please can you tell me how much volt the cdi should give to the ignition coil mine give about 12 volt is this normal?

[@trevhead62Gmail]

Hi there. Thanks for checking out my video. From memory, when your ignition is on, the cdi should supply 12v to the coil. When you kick the engine over, the pulse from the pulse generator will tell the cdi to momentarily cut the supply to the coil. The coil then generates the spark to the plug by the collapsing magnetic field inside the coil. I hope this makes sense.

[@philipthemechanic5782]

@@trevhead62Gmail Thank you for the fast reply, so 12 volt is the right voltage for the ignition coil, i was not sure because on a other bike i saw 50 volt and i tough mine was defect. I think my problem is that im not using the right ignition coil because everything else seem to be in working order.

[@trevhead62Gmail]

The 50v you are seeing could be from the alternator wire which should go to the regulator.
When I get a chance I’ll test the voltage at the coil when it’s running vs just ignition on. I’ll post back results.