1980 CM400T
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  1. #1
    Junior Member thunderskah's Avatar
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    1980 CM400T

    Traded a never used gun for my first bike. The previous owner had it as a project bike and said it needed the carbs cleaned and she'd be good to go, but after reading some very reassuring posts from several members on here I'm proud to say, I'm off to a great start. The bike cranked over and started and ran for a good long while when the PO was showing her to me. He had the carbs unhooked at the boots and sprayed to get her started but she sounded just fine. I took her home and got access to a clymer manual. I took the carbs off and cleaned them, but like an idiot I released the old fuel back into the carbs. She cranked up with no assistance at first, but I'm sure it's because the fuel was some what mixed as she will not start up anymore. So my first step is to get the old fuel out of her to get her started again.

    Things I've done so far:
    Installed brand new charged battery
    Installed brand new K&N air filter
    Changed the engine oil
    Removed the rusted exhaust collector (cannot get it back on)
    Torqued the cylinder Head Bolts
    Adjusted the valves (Noticed the alternator rotor bolt was rusty and the side cover gasket was damaged leaving water in the case)
    Installed brand new spark plugs

    Questions:
    I'm going to remove the fuel tank and use "The Works; Toilet bowl cleaner" to get the rust out of it as suggested in numerous posts. I'll attach a photo. It's not terribly rusty, but want it to be clean before I put new gas in her. Since I have already cleaned the carbs and reinstalled should I just drain what fuel is in them or remove and reclean? Also, I've noticed that there is a reserve, Where is this fuel stored and how do I remove to ensure all the bad fuel is out of the bike?

    This is my first bike and other than maintaining my own car I don't have very much mechanical experience. I also don't have a license yet! Thus the first bike. I told myself I wanted to tear apart and rebuild a bike, so I knew the ins and outs before I got a license. I got the bike in October 12 and it was supposed to be a winter project, but I have since moved and finally have been given an opportunity to work on it some more and found this website! I can't wait to get this bike back to its glory days and take her on a long trip somewhere!
    Attached Thumbnails Attached Thumbnails 1980 CM400T-imag0210.jpg   1980 CM400T-fuel-tank-before.jpg   1980 CM400T-imag0210.jpg  

  2. #2
    Super Moderator J-T's Avatar
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    Re: 1980 CM400T

    You should be fine just draining the fuel from the carbs. When you remove the petcock inspect the screen and standpipe. If they're good you shouldn't have gotten any rust into your carbs unless you were running on "Reserve". BTW do not clean the tank with the petcock installed. Remove it and clean it seperately.

    With the petcock in the "On" position you are getting fuel from the tank through the standpipe. When the fuel level drops below the top of that standpipe you "run out of gas". When you switch to reserve you bypass the standpipe and access the remaining fuel in the tank.
    JT
    81 CM400T Under re-construction
    82 GL500

  3. #3
    Junior Member thunderskah's Avatar
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    Re: 1980 CM400T

    I'll be sure to remove the petcock to inspect and clean. So the reserved gas is in the gas tank itself? If that's the case, I"m assuming I can just switch to reserve and drain the fuel out into my container?

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  5. #4
    Junior Member thunderskah's Avatar
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    Re: 1980 CM400T

    So I cleaned the tank out with "The Works: Toilet bowl cleaner" and it came out very well done, but I now know why there wasn't much fuel left in the tank. The Petcock is leaking fuel. I did remove it before the clean. I'm searching the web for a new one and came across this cheap one considering all other sites are selling them for $63-70 USD. http://4into1.com/honda-motorcycle-fuel ... 6-x-1-5mm/ What are everyone's thoughts? Are there cheaper ones out there? Can it be repaired?

  6. #5
    Super Moderator longdistancerider's Avatar
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    Re: 1980 CM400T

    Everything looks right. Great price.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration


    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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  7. #6
    Junior Member thunderskah's Avatar
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    Finally bought the petcock and after moving several times. I plan to get it installed and up and running this month. That's my goal anyways. Finally had the money to do something to it.

  8. #7
    Junior Member thunderskah's Avatar
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    6 years later I start again to get this bike up and running. I haven’t been able to get a compression test yet. I did get a multimeter and did the ignition checklist test. Results as follows:
    Spark plug coil Y/G 1.3
    Plug wires w/o caps 8.02
    Plug caps 5.63 & 5.48
    Stator P/G 137.7
    W/B 84.2
    Couldn’t find pickup coil Brown/Light Blue-Any pictures anyone have?
    Not getting any readings for run/kill switch- maybe because I have a bad battery? Or don’t know how to use multimeter properly?
    Alternator Y/Y all between 1.2-1.4
    Multimeter just says 1. When checked against ground. Is this infinity?
    Also when I popped the stator cover off to try and find the pickup coil I found it full of water and rust. Is this serious damage?



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  9. #8
    Senior Member Polish's Avatar
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    Had the same on my bike. Clean everything with fine sand paper (be careful for the pick ups) and WD-40 and coated the rotor afterwards and all worked fine.
    You'll need a special puller to remove it and clean the back side of the rotor, the stator and the engine case as well.

    Abvisiously, a new gasket!
    Attached Thumbnails Attached Thumbnails 1980 CM400T-image_1557936683631.jpg  
    Last edited by Polish; 05-15-2019 at 01:02 PM.
    thunderskah likes this.
    JL
    1979 CB 400 T (Cafe Racer)

  10. #9
    Super Moderator longdistancerider's Avatar
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    Here's the wiring pictures needed. The colors bleed away over time so if you strip back the sheathing on the harness you'll find them
    1980 CM400T-201_4135.jpg1980 CM400T-201_4136.jpg1980 CM400T-201_4138.jpg
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration


    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?"
    Member Map https://www.hondatwins.net/forums/dcMembermap.php

  11. #10
    Junior Member thunderskah's Avatar
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    Polish, thanks for the stator pic. Cleaning it now. Did you coat it with WD40 or just use it to clean with?


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