1980 Honda CM200T - Weak/Sporadic Spark - Page 2
Page 2 of 3 FirstFirst 1 2 3 LastLast
Results 11 to 20 of 28
Like Tree3Likes

Thread: 1980 Honda CM200T - Weak/Sporadic Spark

  1. #11
    Senior Member dtsmjr8dan's Avatar
    Join Date
    Oct 2011
    Location
    Windsor, Ontario, Canada
    Posts
    8,261
    1979 CM400T (rider),
    1981 CM400T (in surgery receiving transplant)
    1982 CM450 (parts bike)
    1982 CB450 (parts bike)
    Past rides: Vincents, Triumph, BSA's, Suzuki's, Twingle, Corgy, others.
    Remember, today is the tomorrow we worried about yesterday.
    My chest fell, but, fortunately, my belt caught it.
    I don't know everything, nor, have I met the one who does.

    T-shirt sales supporting 66Sprint's LSR Build http://www.hondatwins.net/forums/22-...d-attempt.html

  2. #12
    Super Moderator longdistancerider's Avatar
    Join Date
    Oct 2011
    Location
    Vancouver Washington (text 408-239-9580)
    Posts
    17,509
    Quote Originally Posted by broomie View Post
    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?
    To quote my parts guy from BMC in 1970, "New means it hasn't been used before"
    dtsmjr8dan likes this.
    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?"
    Member Map http://www.hondatwins.net/forums/dcMembermap.php

  3. #13
    Member broomie's Avatar
    Join Date
    May 2015
    Location
    Schomberg, Ontario, Canada
    Posts
    51
    So my buddy that's helping me was able to find a new condenser, and still nothing at all while cranking the engine. No cough or sputter, any other ideas?

  4. Remove Advertisements
    HondaTwins.net
    Advertisements
     

  5. #14
    Super Moderator longdistancerider's Avatar
    Join Date
    Oct 2011
    Location
    Vancouver Washington (text 408-239-9580)
    Posts
    17,509
    So it's gone from intermittent spark to no spark after replacing the condenser? Re-inspect the condenser connection for grounding out.
    This may be an electrical issue upstream from the points/coil like an ignition switch. Try connecting straight from the battery bypassing all the other electrical system.
    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?"
    Member Map http://www.hondatwins.net/forums/dcMembermap.php

  6. #15
    Member broomie's Avatar
    Join Date
    May 2015
    Location
    Schomberg, Ontario, Canada
    Posts
    51
    longdistancerider, there is spark, but it is mostly weak with a few fat blue sparks here and there. Thanks for the suggestion, I'll give the bypass method a shot.

  7. #16
    Member Kungfutoast's Avatar
    Join Date
    May 2013
    Location
    Portland, OR
    Posts
    53
    Hmm did you rebuild your engine or someone before you? Have you ever had it running? Is it possible the cam is 180 off? Is it sparking out of time. How have you reduced its a weak spark? If your coil is within spec and the condenser is too that leave points gap is not right,spark plug gap not right or wrong plugs, or Maybe the issue is else where. Run though the basics. Valves, carbs sync, new battery etc. make a check list and follow what mom says.


    Sent from my iPhone using Tapatalk
    '80s 150 Elite (road worthy)
    '75 CB200t (under construction)
    '76 KZ750 Twin (seen better days)
    '81 XS650 (big pile of metal)

  8. #17
    Member broomie's Avatar
    Join Date
    May 2015
    Location
    Schomberg, Ontario, Canada
    Posts
    51
    Could a bad battery be the issue? We did a load test on it and the voltage dropped pretty low (5.5 ish).

  9. #18
    Super Moderator longdistancerider's Avatar
    Join Date
    Oct 2011
    Location
    Vancouver Washington (text 408-239-9580)
    Posts
    17,509
    Quote Originally Posted by broomie View Post
    Could a bad battery be the issue? We did a load test on it and the voltage dropped pretty low (5.5 ish).
    Battery voltage is very important, possibly this is the cause
    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?"
    Member Map http://www.hondatwins.net/forums/dcMembermap.php

  10. #19
    Member broomie's Avatar
    Join Date
    May 2015
    Location
    Schomberg, Ontario, Canada
    Posts
    51
    @longdistancerider @Kungfutoast, thank you for your ideas and input. I am waiting on the acid to come for the battery. I'll post an update once it's been charged and load tested.

    Would a bad battery also cause the bike to not start by being push started?

    Thanks guys!

  11. #20
    Super Moderator longdistancerider's Avatar
    Join Date
    Oct 2011
    Location
    Vancouver Washington (text 408-239-9580)
    Posts
    17,509
    It's a possibility, I haven't worked on one of them so I don't know for sure
    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?"
    Member Map http://www.hondatwins.net/forums/dcMembermap.php

Page 2 of 3 FirstFirst 1 2 3 LastLast

Sponsored Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •