Spark still possible with bad CDI? | cvetitula.ru
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post #1 of 13 (permalink) Old 11-24-2012, 05:00 PM Thread Starter
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Spark still possible with bad CDI?

Good afternoon. I just inherited a 2002 TRX 90, but can't get it to fire up. I have cleaned out the carb, and know fuel is reaching the cylinder. When I yank on the pull starter I get spark to the plug. I have also used my multimeter to check resistance on the CDI, but don't get any readings. Is it possible to get spark at the plug with a faulty CDI box? TIA.

Sean
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post #2 of 13 (permalink) Old 11-24-2012, 06:47 PM
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When you check the plug is it wet with gas after trying to start it? Did you do a compression test?

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post #3 of 13 (permalink) Old 11-24-2012, 07:18 PM Thread Starter
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Yes plug is moist, and no on compression test. BTW, thanks for the reply.
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post #4 of 13 (permalink) Old 11-24-2012, 07:24 PM Thread Starter
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Quote:
Originally Posted by Melatv View Post
When you check the plug is it wet with gas after trying to start it? Did you do a compression test?
I did remove the lower valve cover, and found a little bit of oil pooled in the cover. Mean anything?
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post #5 of 13 (permalink) Old 11-24-2012, 08:36 PM
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I had a whole bunch of spark/no spark issues with my bike, a 1991 Honda 350 4x4, then I remembered that I read on here somewhere that a member had to give his cdi a tap then it would be good again, I did the same and I was good to go (I replaced the cdi) so it is possible to have a bad(?) cdi and get spark but I found it wasn't steady or reliable


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post #6 of 13 (permalink) Old 11-24-2012, 08:36 PM
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You can get intermitten spark with a cdi going bad..What color is the spark?? Bright Blue??

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post #7 of 13 (permalink) Old 11-24-2012, 08:45 PM Thread Starter
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I get a Yellowish/blueish, but not BRIGHT blue spark. That's good to know I can still get spark with failing CDI. I actually call a local dealer, and was told that if I have spark the CDI is still good. I'm not sure what to think now. A factory CDI is around $145, and I found a "Big Gun" rev box on Amazon for $114 shipped. I may go that route. Any other members have any more input? Thanks Again.
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post #8 of 13 (permalink) Old 11-25-2012, 07:38 AM
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Check the compression --- you will see oil in the valve cover that is normal.

2011 Honda TRX420FPA PG CTE camo EPS
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post #9 of 13 (permalink) Old 11-25-2012, 07:48 AM
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If you have the cover off there is a pink wire in a spring style lock you can removed that wire and check the spark again. However You more than likely have a bad pulse generator.

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post #10 of 13 (permalink) Old 11-25-2012, 06:50 PM
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Welcome to da forums... Yes it is possible to get spark to the plug if the cdi is going bad... If the cdi is going bad it can have a whitish/yellow colored spark,or an intermittent spark,but will eventually quit having any spark at all(usually pretty soon)..You can see if the cdi gets hot to the touch if you can get it to run,and if it is hot then it is going out...Cold to slightly warm is ok...Also,check the coil itself,and the coil wire using the meter,and specs from the free e manual located in the schematics,and repair manual section on the main page.. cvetitula.ru is the password if prompted for one...

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