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Hey Everyone,
Been trying to figure out the dramatic power loss I’ve been having for a while now. Motor was running great for a while about 42mph WOT. One outing I was at idle and I lost two cylinder and could only get up to 17mph WOT. After that I noticed the motor would start up and run great for about 10 min and then cut out.
The first thing I did was check for spark. Got spark to all cylinders. Next I checked compression, 120psi to all cylinders. Then I cleaned carbs really really good. Replaced fuel pump diaphragm. I double checked timing and it was good. Reed valves were good.
Couldn’t figure it out.
All of a sudden, I was getting the power loss conditions from the moment I started the motor.
Went to check the spark again and noticed I wasn’t getting spark on the bottom two cylinders.
I’ll be the first to say that electrical is my nemesis.
I checked Charge coil and trigger coils resistance. Trigger coils came in at 325 for both. Which is close to the bottom of the range.
I switched the leads from the CDI unit to the ignition coils and I was getting spark on the bottom two cylinders and not the top two. Which proves to me that the ignition coils are good. So now I think it’s either the CDI unit or the trigger coils. But I’m kinda stuck.
Is there a way for me to test the CDI unit?
Sorry for the long winded post, just trying to give as much info as possible.
Any input would be greatly appreciated!
Been trying to figure out the dramatic power loss I’ve been having for a while now. Motor was running great for a while about 42mph WOT. One outing I was at idle and I lost two cylinder and could only get up to 17mph WOT. After that I noticed the motor would start up and run great for about 10 min and then cut out.
The first thing I did was check for spark. Got spark to all cylinders. Next I checked compression, 120psi to all cylinders. Then I cleaned carbs really really good. Replaced fuel pump diaphragm. I double checked timing and it was good. Reed valves were good.
Couldn’t figure it out.
All of a sudden, I was getting the power loss conditions from the moment I started the motor.
Went to check the spark again and noticed I wasn’t getting spark on the bottom two cylinders.
I’ll be the first to say that electrical is my nemesis.
I checked Charge coil and trigger coils resistance. Trigger coils came in at 325 for both. Which is close to the bottom of the range.
I switched the leads from the CDI unit to the ignition coils and I was getting spark on the bottom two cylinders and not the top two. Which proves to me that the ignition coils are good. So now I think it’s either the CDI unit or the trigger coils. But I’m kinda stuck.
Is there a way for me to test the CDI unit?
Sorry for the long winded post, just trying to give as much info as possible.
Any input would be greatly appreciated!
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