Morning everyone,
Little bit of history if you care otherwise skip to the problem.
I just picked up a Roketa 250cc 2 wheel drive 4wheeler from a friend. He put about 40 miles on it (yes very low milage) and said he could never start it after that. It had sat in his garage for about 3 years. I replaced the gas and cleaned out the lines, checked the spark and had a some. Ran the wheeler down the road about 1/2 mile, pulled into my garage and it died. I tried to restart with no luck. Check the spark and guess what...no spark. I am new to ATV's, and have a little engine experience. I have done some reading out at roketaonlineparts.com in thier troubleshooting guide and found out about the three things that "could" be wrong.


Problem: No Spark.
I have removed and replaced the CDI, still no spark.
I have removed and replaced the coil, still no spark.
I have replaced the spark plug, still no spark. I have the kill switch set to "run" still no spark.

When the kill switch is in the off position it won't even turn over. I am capable of changin out the Stator, but would like to get more information before starting.

5 pin CDI

your time and advise is mucho mucho appreciated.

Lefte in the great, soon to be white, flat, North of Dakota.

 

Your CDI is 5 pin? Like this?



The wiring diagram I have for a roketa 250cc shows a six pin DC powered CDI that looks more like this:



Lets figure which CDI first, and once we know that then make some ignition system measurements to see why you have no spark.

 

I am with Lynn on this. I checked all wires individually from ignition switch forward.
I went ignition switch to CDI to coil to plug.
Somewhere in this line the spark is stopping, use a voltmeter and check each lead while cranking motor.
A loose wire connection or bad wire could be all that is wrong. it will take a little detective work with meter.

 

The CDI I have has 6 pins, but only 5 wires. Here is a picture of it from the web site I found.

Lefte

 

You have connectors that are more square than mine but the wiring is the same as the six pin CDI that I posted earlier. But according to the wiring diagram I see your CDI powered by 12 volts DC, and not from high voltage AC from the stator.

1) Unplug your CDI. Turn on the ignition. Use a meter to measure the DC voltage from the "AC Ignition Power" pin in the wiring harness (which should be labeled "switched DC power" in your case) to both ground pins on the same connector. You should read 12 volts DC.

2) Leave the CDI unplugged. Leave the ignition switch on. Set all kill switches to the 'run' position. Set your meter to ohms on the 200K ohms full scale range. Measure resistance of the kill switch pin to ground. What do you measure? Turn the ignition switch off and repeat the ohms measurement. What do you read now?

3) Leave the CDI unplugged. Set your meter to AC volts on the lowest AC scale you have. 20 volts AC (or even less) would be ideal. Crank the starter motor and measure Timing/Trigger pin voltage at the CDI connector to each of the two ground wires at the same connector. You're looking for a low AC voltage on the timing trigger pin while cranking to one or both ground wires on the same connector. What AC voltage do you measure? Do you get the same voltage from the timing triggger pin to both ground pins on the CDI connector?

 

Found it!!! It was a loose wire from the stator into the other pig tail connection. The wire was pushed out about 1/4 of an inch. All is working and running great!!

Thanks

Lefte

 

just a quick question where is the cdi for a 125cc taotao?

 

Follow the yellow/black wire backwards from the coil to the CDI harness/connector.

 

hi my name is joey im working on a rocketa 250 like a 2000 year model i need the ignition switch wiring and pluse the wiring for the coil and stator plus where are these located? thank you

 

If you go to Roketapartsonline.com they have one there for free.

Chinese ATV Service Manuals for Roketa ATVs - Go Karts - Scooters and Dirt Bikes - RoketaPartsOnline.com

Hope this helps.

Lefte