1980 Honda CM200T - Weak/Sporadic Spark
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Thread: 1980 Honda CM200T - Weak/Sporadic Spark

  1. #1
    Member broomie's Avatar
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    1980 Honda CM200T - Weak/Sporadic Spark

    Hello again everyone! It's been awhile since I have posted, back at it! Want to get this baby running!

    Currently the plugs are sparking (blue colour), not very strong though and when a bit of gas gets on them no spark at all. Nothing. When plugs dry out, the spark comes back but it's a bit sporadic at first then more consistent, but still a weak looking blue. Any ideas would be greatly appreciated! Be well!
    Chris - the ghost rider
    1980 Honda CM200T - ongoing project

  2. #2
    Super Moderator longdistancerider's Avatar
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    The battery needs to be at full charge with a points ignition system. I would start by checking grounds of the wiring harness and engine. Use and OHM meter and measure resistance from each ground terminal and the engine case to the negative battery post. IF you connect to the Positive post you will fry the meter. Ohm reading should be no more than 5 which isn't very good. Preferably it'll be .5-1 ohm or less.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

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  3. #3
    Member broomie's Avatar
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    longdistancerider thanks for your suggestion, the battery is at full charge (6.66). Checked all the grounds, they are good and clean.
    Last edited by broomie; 09-28-2016 at 10:38 PM.

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    Member broomie's Avatar
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    So a buddy of mine is now helping me and he is just as stumped. We swapped condensers and the spark got a bit stronger but it's only strong every couple of sparks or so. Any ideas?
    Kungfutoast likes this.

  6. #5
    Member zway2b's Avatar
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    Quote Originally Posted by broomie View Post
    So a buddy of mine is now helping me and he is just as stumped. We swapped condensers and the spark got a bit stronger but it's only strong every couple of sparks or so. Any ideas?
    So if you have timed, gapped and cleaned the points not much else it could be. check grounds again or maybe coil or kill switch.
    Dave
    zway2b
    1978 CM185T

  7. #6
    Super Moderator longdistancerider's Avatar
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    Coil resistance tests? I don't have the specs for that.
    Grounds are clean but is there resistance? Electricity has to flow from it's source back to to the source with as little resistance as possible.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

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  8. #7
    Member broomie's Avatar
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    Thanks for the replies guys. I've check the coil resistance and get .5 on the primary and 12,000 and change on the secondary. Within the specified range. Stumped...

  9. #8
    Super Moderator longdistancerider's Avatar
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    Plug end caps? Not sure if you have resisted ones or not but if resisted they'd be 5K ohms
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

    http://www.hondatwins.net/forums/22-...d-attempt.html and http://www.hondatwins.net/forums/1-p...r-attempt.html
    Road Trip http://www.hondatwins.net/forums/11-...here-i-go.html or "where's Jim now?"
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  10. #9
    Member broomie's Avatar
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    Update:

    Spent some time on it last night with a seasoned points guy. After a good amount of testing (and cursing) we discovered that the condenser is more than likely bad. I had 3 spares from when I bought the bike and they all tested no good. Seems really weird/unlikely that 4 condensers would be bad.... Thoughts?

  11. #10
    Member broomie's Avatar
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    Forum members; does anyone have a 6 volt condenser (or 2) that I can purchase??? Can't find one anywhere.

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