Bike Won't Go Past 4000 RPM - Page 3
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  1. #21
    Senior Member 76TWIN's Avatar
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    Doesn't this bike have CDI ignition system?
    You can check the timing with one of these https://www.ebay.com/itm/Engine-Igni...temCondition=3

    but practically any auto part stores would have one for sale or rent/borrow also.

    That being said, how would one even adjust the timing for a CDI?
    '76 CB500T Frankenbike
    '73 CL450 (basket case for now)


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  2. #22
    Senior Member 80cb400t's Avatar
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    It's a pass fail kind of thing, one of the symptoms of a failed one is that the bike won't go over 4000 rpm because it fails to advance. There's a guy selling them on ebay who has a full symptom list
    1980 CB400T - 1 running, 1 parts bike
    1965 CB160 - 1 kind of running, 1 parts bike

  3. #23
    Member jgordonoglan's Avatar
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    Quote Originally Posted by 80cb400t View Post
    There's a guy selling them on ebay who has a full symptom list
    Do you happen to have a link to this guy? I don’t know if searching from Canada is making it different but all I’m coming across are random pieces for different parts of the ignition system. But I’ll keep looking to see what I find.
    Jarrod

    1982 CB450SC - first bike

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  5. #24
    Senior Member 80cb400t's Avatar
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    You might want to message him before ordering to confirm his boxes will work with your cdi

    https://www.ebay.com/itm/Honda-CDI-B...gAAOxyxpxQ7rNj
    1980 CB400T - 1 running, 1 parts bike
    1965 CB160 - 1 kind of running, 1 parts bike

  6. #25
    Member jgordonoglan's Avatar
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    So I wasn't able to get my hands on a timing light to test that out. I'm heading off island tomorrow for a few days so I'll be able to pick one up and get that checked out.

    I did however take apart the carbs to check them out, somewhat anyway. I just wanted to see if there was anything that jumped out at me with the jets. I didn't notice anything wonky with them. Put everything back and the bike is still running like it was, gets up to 4000 RPM and won't go any higher.

    Hopefully I'll have a better update next week when I'm able to work on the bike again.

    Thank you everyone for helping me out with this. Really appreciate all the advice.
    Jarrod

    1982 CB450SC - first bike

  7. #26
    Super Moderator longdistancerider's Avatar
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    Here's the relevant thread for the ignition https://www.hondatwins.net/forums/64...78-1986-a.html
    There are 2 choices for a CDI replacement. 1) CDI Magician on eBay and 2) Rex's Speed Shop in the UK
    Biggest difference in them is Rex's is a plug-n-play while the other is a cut and solder your old connectors to it.
    UK vs. US customs may come into play also since this is a Canadian destination

    Timing can only be "adjusted" by swapping in different stators and CDI boxes,you're playing with resistance values.
    If one wants to actually have adjustable and accurate timing, Honda's version isn't either one, then you would go with the Ignitech DCCDI-P2 unit
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 nuts and bolts restore in progress


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  8. #27
    Member jgordonoglan's Avatar
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    Quote Originally Posted by longdistancerider View Post
    Timing can only be "adjusted" by swapping in different stators and CDI boxes
    So I get my hands on a timing light, test it to see if it’s out, if it is I pick one of these two options for purchasing one to replace the bad one on the bike?

    Then later down the road if I feel like being able to adjust the timing I switch to a different system.
    Jarrod

    1982 CB450SC - first bike

  9. #28
    Super Moderator longdistancerider's Avatar
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    I played with 3 CDI's and 3 stators and the advance was late on all combinations.
    In checking the timing you're going to be looking for it to advance with the throttle. If it doesn't advance then it likely is the stator, not the CDI. Use your VOM and run thru the ignition tests in the thread I linked earlier.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 nuts and bolts restore in progress


    https://www.hondatwins.net/forums/22...d-attempt.html and https://www.hondatwins.net/forums/1-...r-attempt.html
    Road Trip https://www.hondatwins.net/forums/11...here-i-go.html or "where's Jim now?"
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  10. #29
    Member jgordonoglan's Avatar
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    Quote Originally Posted by longdistancerider View Post
    I played with 3 CDI's and 3 stators and the advance was late on all combinations.
    In checking the timing you're going to be looking for it to advance with the throttle. If it doesn't advance then it likely is the stator, not the CDI. Use your VOM and run thru the ignition tests in the thread I linked earlier.
    Sounds good. I'll post an update next week when I'm home again and able to work on the bike. Thank you!
    Jarrod

    1982 CB450SC - first bike

  11. #30
    Member jjdugen's Avatar
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    My 350 does exactly this, if I forget to knock the choke off once warm. The choke only has to be on by a few degrees too.....

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