EP9: Fixing up a Honda CT90 | Diagnostics | Why does it die while riding?

[@dnlmachine4287]

Beautiful little machines. So well made. Check Spark Plug Cap resistance. Most older Hondas and bikes, single and twin cylinder have 10,000 (10K) ohms ignition resistance between ignition coil to spark plug electrode. Usually a 10K ohm spark plug cap with a low resistance (plain copper) plug. Some use a 5K ohm spark plug cap with a 5K ohm spark plug for a total of 10K ohms. I had identical problems as you with a mid 70s XL Honda, new plug worked for about 30 minutes, then got weak spark, plug cap was 15K ohms, swapped to a 10K ohm plug cap, perfect runnning again. Stay gold.

[@colinmuter1621]

Love the videos working on a cheapo ct200 right now

[@MTBottleBoys]

Thanks for tuning in. We wish you best of luck with your CT restoration!

[@bewilderment9268]

Mine died while riding. 1974 CT90, gas cap did not breath properly.