CT-90 need some advice

riche · Nov 3, 2002

I did a search on ct90 and ended up reading about all you guys that loved that bike. Someone gave me a 78 in ok shape but I can't get any spark. I probably need a manual on this because it has points/condensor, coil and I think a rectifier. I ohmed out the coil and rectifier just to see if I had a circuit and it was'nt blown. Those had continuity and the points look in good shape,I don't know the gap. One time I accidently kicked the engine over with my hand while holding the coil , damn I got juiced. Soo, It can shock me but not the plug 'what gives' . If any of you guys have any experience with this little fun bike I could sure use some advise. Thanks Rich

bruce j · Nov 4, 2002

If the coil is making proper voltage, the problem has to be after the coil - check the plug wire, cap, and spark plug itself. You can get little plug wire testers at auto parts stores for a couple dollars that should do the job. Another thought: the coil may have been grounded through your body when you held it, but not getting a good ground when it's mounted on the frame, so make sure the ground is clean. Good luck!
PS Not sure the exact spec. for plug gap on the CT90. My XL100 (77 model ) uses .020" and works well.

70 marlin · Nov 7, 2002

With that old bike I'd file the points, sand the inner flywheel & replace the condenser. Then give it a try. Also check the spark plug cap some of them old bikes had screw ON’s that came loose. Good luck

riche · Nov 9, 2002

Thanks Bruce and Marlin. Rich

CT-90 need some advice

riche

bruce j

70 marlin

riche

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