renegade15
Petty Officer 3rd Class
- Joined
- Mar 29, 2009
- Messages
- 99
Motor is a Yamaha year 2000 2-stroke C50tlry. I got the CDI troubleshooting page from CDI Electronics site to measure all the voltages I reference below.
So set out on a fishing day and idling out of the marina, boat died...dead in the water. Cranks but would not restart. Luckily was able to pole back to the dock and get on the trailer, headed home to diagnose. Discovered I was getting no spark to any cylinder...checked the usual suspects (kill switch, good battery voltage, good spark plugs) and borrowed a DVA adapter for my multimeter and discovered my voltage in the brown stator wire was in the teens, when it should have been 125V...pointing me to the CDI. I bought a used CDI and hooked it up. Started right up...yaay...still not right though as it was only running on the top two cylinders. Tested all trigger/pulse coil to cdi connections and they tested out fine going to the CDI, but voltage was low from the CDI to the bottom coil, should have been atleast 125V and was 50.3V. The top two were about 190V.
SO the million dollar question, can anything but another bad CDI cause that drop to one coil when the voltages going into the CDI are fine? Is it possible there is something else on the motor that could have damaged the used CDI to affect only one cylinder?
I'm pretty sold on picking up one of the CDI Electronics aftermarket CDIs since they are fairly highly regarded and a couple hundred less $$$ than Yamaha OEM. But I don't want to hook up a brand new unit and risk damaging it if that is a possibility.
Thanks in Advance!
So set out on a fishing day and idling out of the marina, boat died...dead in the water. Cranks but would not restart. Luckily was able to pole back to the dock and get on the trailer, headed home to diagnose. Discovered I was getting no spark to any cylinder...checked the usual suspects (kill switch, good battery voltage, good spark plugs) and borrowed a DVA adapter for my multimeter and discovered my voltage in the brown stator wire was in the teens, when it should have been 125V...pointing me to the CDI. I bought a used CDI and hooked it up. Started right up...yaay...still not right though as it was only running on the top two cylinders. Tested all trigger/pulse coil to cdi connections and they tested out fine going to the CDI, but voltage was low from the CDI to the bottom coil, should have been atleast 125V and was 50.3V. The top two were about 190V.
SO the million dollar question, can anything but another bad CDI cause that drop to one coil when the voltages going into the CDI are fine? Is it possible there is something else on the motor that could have damaged the used CDI to affect only one cylinder?
I'm pretty sold on picking up one of the CDI Electronics aftermarket CDIs since they are fairly highly regarded and a couple hundred less $$$ than Yamaha OEM. But I don't want to hook up a brand new unit and risk damaging it if that is a possibility.
Thanks in Advance!