78 Suzuki RM 400 won't start
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  1. #1
    Newbie
    My Bike(s)
    78 Suzuki RM 400
    Location
    Spokane, WA
    Posts
    1

    78 Suzuki RM 400 won't start

    I just bought a 78 RM 400 and I can get it to kick about once every 50 tries. This bike has been sitting a while and my cousin put straight gas in it. I emptied the tank, cleaned the carb out. I had it running once since I've owned it to I know it runs and it has good compression. Runs well once it is started, but starting it is a challenge. Any ideas? Is it possible to have weak spark that comes and goes? Also, I'm somewhat new to the different types of bikes, but it's an RM 400, but why does it say "1000 cc" on the side of the engine? Any feedback is greatly appreciated. Thanks

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  3. #2
    Newbie
    Posts
    2
    Hello did you sort your rm400 out ,I have same symptoms regards Chris

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  4. #3
    M-J Lifetime Achievement Award
    My Bike(s)
    Yamaha MT09
    Location
    Perth WA
    Posts
    6,243
    I seriously doubt you will hear back from him...his post is 9 year ago. Post up what the problem is...offhand I would suggest you try some carb cleaner in and leave it for as long as you can...if it will run slightly then all the better to get it into the carbs idle circuits which I suspect will be clogged. Also if this bike has points check them for gap, cleanliness and timing. If badly pitted then suspect the condenser/capacitor....capacitor is another name for the same thing.

    Also check the plugs and the plug caps and cables for cracks and deterioration. Hold the plug/s against the cylinder while cranking to see if you are getting a decent spark...it needs to be fat and blue...a weak yellow one indicates a problem. Make sure your battery is in good condition, fully charged...you should read 12.5 VDC across the terminals at rest with a meter....check the terminals are firmly attached and clean.

    If the plugs are dry then you are not getting any or sufficient fuel through a fuel filter may need cleaning or the fuel tap might need attention.Try cranking it with the fuel cap open to make sure the tank vacuum system isnt failing. A few ideas to try.

    Good luck
    Last edited by Aussie Steve; 06-09-2017 at 03:09 AM.
    Smoke me a kipper I'll be home in time for breakfast

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  6. #4
    Newbie
    Posts
    2
    Thank you Steve

    Sent from my SM-T555 using Tapatalk


 

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